Freescale MC68HC705L16 Microcontroller Datasheet

MC68HC05L16
MC68HC705L16
Data Sheet
M68HC05
Microcontrollers
MC68HC05L16
Rev. 4.1
9/2005
freescale.com
Blank
MC68HC05L16
MC68HC705L16
Data Sheet
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Revision History
Date
Revision
Level
Description
Page
Number(s)
May,
2002
4.0
Reformatted to add additional page references and correct World Wide
Web address
N/A
September,
2005
4.1
Updated to meet Freescale identity guidelines.
Throughout
Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc.
© Freescale Semiconductor, Inc., 2005. All rights reserved.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
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Revision History
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
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Freescale Semiconductor
List of Chapters
Chapter 1 General Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Chapter 2 Memory Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Chapter 3 Central Processor Unit (CPU). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Chapter 4 Resets and Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Chapter 5 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Chapter 6 Parallel Input/Output (I/O) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Chapter 7 Oscillators/Clock Distributions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Chapter 8 Simple Serial Peripheral Interface (SSPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Chapter 9 Timer System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Chapter 10 LCD Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Chapter 11 Instruction Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Chapter 12 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Chapter 13 Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Chapter 14 Ordering Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Appendix A MC68HC705L16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
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List of Chapters
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Freescale Semiconductor
Table of Contents
Chapter 1
General Description
1.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3
MCU Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4
Mask Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5
Functional Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.1
VDD and VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.2
OSC1 and OSC2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.2.1
Crystal or Ceramic Resonator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.2.2
External Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.3
XOSC1 and XOSC2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.3.1
Crystal Resonator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.3.2
External Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.4
RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.5
Port A (PA0–PA7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.6
Port B (PB0–PB7/KWI0–KWI7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.7
Port C (PC0/SDI, PC1/SDO, PC2/SCK, PC3/TCAP, PC4/EVI,
PC5/EVO, PC6/IRQ2, and PC7/IRQ1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.8
Port D (PD1–PD3/BP1–BP3 and PD4–PD7/FP34–FP27). . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.9
Port E (PE0–PE7/FP38–FP35) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.10
VLCD1, VLCD2, and VLCD3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.11
NDLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6
Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6.1
Mode Entry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6.2
Single-Chip Mode (SCM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6.3
Self-Check Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
13
13
15
15
17
17
17
18
18
18
19
19
19
19
19
19
20
20
20
20
20
21
21
Chapter 2
Memory Map
2.1
2.2
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input/Output and Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Read/Write Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Read-Only Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Write-Only Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reserved Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Option Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Summary of Internal Registers and I/O Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23
24
24
24
24
24
24
25
25
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Table of Contents
2.4
2.4.1
2.4.2
2.4.3
2.4.4
2.4.5
2.4.6
2.5
2.6
2.7
Option Map for I/O Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Resistor Control Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Resistor Control Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Open-Drain Output Control Register 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Open-Drain Output Control Register 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Key Wakeup Input Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mask Option Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self-Check ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mask ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29
31
31
32
32
33
33
34
34
34
Chapter 3
Central Processor Unit (CPU)
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CPU Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Condition Code Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stack Pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Program Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Arithmetic/Logic Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35
35
36
36
36
37
37
37
Chapter 4
Resets and Interrupts
4.1
4.2
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.3
4.4
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IRQ1 and IRQ2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Key Wakeup Interrupt (KWI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IRQ (KWI) Software Consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timer 1 Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timer 2 Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SSPI Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timebase Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interrupt Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interrupt Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39
40
40
40
40
41
41
41
41
45
46
Chapter 5
Low-Power Modes
5.1
5.2
5.3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
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Table of Contents
Chapter 6
Parallel Input/Output (I/O)
6.1
6.2
6.2.1
6.2.2
6.3
6.4
6.4.1
6.4.2
6.5
6.5.1
6.5.2
6.6
6.6.1
6.6.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port A Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port A Data Direction Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port C Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port C Data Direction Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port D. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port D Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port D MUX Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port E Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port E MUX Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
51
52
52
52
53
53
54
55
55
56
56
56
57
57
Chapter 7
Oscillators/Clock Distributions
7.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2
OSC Clock Divider and POR Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.3
System Clock Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.4
OSC and XOSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.4.1
OSC on Line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.4.2
XOSC on Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.4.2.1
XOSC with FOSCE = 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.4.2.2
XOSC with FOSCE = 0. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.4.2.3
XOSC with FOSCE = 0 and STOP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.4.2.4
Stop Mode and Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.5
Timebase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.5.1
LCDCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.5.2
STUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.5.3
TBI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.5.4
COP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.5.5
Timebase Control Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.5.6
Timebase Control Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.5.7
Miscellaneous Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
59
59
60
60
60
61
61
62
62
62
63
63
63
63
64
65
66
67
Chapter 8
Simple Serial Peripheral Interface (SSPI)
8.1
8.2
8.3
8.4
8.4.1
8.4.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal Block Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPDR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
69
69
69
70
71
71
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Table of Contents
8.4.3
8.4.4
8.4.5
8.5
8.5.1
8.5.2
8.6
8.6.1
8.6.2
8.6.3
8.7
SPCR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPSR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CLKGEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SSPI Data I/O (SDI and SDO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Clock (SCK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Peripheral Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Peripheral Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Peripheral Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Port Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
71
71
71
71
71
72
73
73
74
75
75
Chapter 9
Timer System
9.1
9.2
9.2.1
9.2.2
9.2.3
9.2.4
9.2.5
9.2.6
9.2.7
9.3
9.3.1
9.3.2
9.3.3
9.3.4
9.3.5
9.3.6
9.3.7
9.4
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timer 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Compare Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Capture Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timer Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timer Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timer During Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timer During Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timer 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timer Control Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timer Status Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Compare Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timer Counter Register 2
...............................................
Timebase Control Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timer Input 2 (EVI). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Event Output (EVO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prescaler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
77
77
79
79
80
80
81
82
82
82
85
87
87
88
88
89
91
93
Chapter 10
LCD Driver
10.1
10.2
10.3
10.4
10.5
10.6
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
LCD Waveform Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Backplane Driver and Port Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Frontplane Driver and Port Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
LCD Control Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
LCD Data Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
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Table of Contents
Chapter 11
Instruction Set
11.1
11.2
11.2.1
11.2.2
11.2.3
11.2.4
11.2.5
11.2.6
11.2.7
11.2.8
11.3
11.3.1
11.3.2
11.3.3
11.3.4
11.3.5
11.4
11.5
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inherent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Immediate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Direct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Extended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indexed, No Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indexed, 8-Bit Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indexed, 16-Bit Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Relative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Instruction Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Register/Memory Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Read-Modify-Write Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump/Branch Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bit Manipulation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Instruction Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Opcode Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
103
103
103
103
103
104
104
104
104
104
105
105
106
107
108
108
109
114
Chapter 12
Electrical Specifications
12.1
12.2
12.3
12.4
12.5
12.6
12.7
12.8
12.9
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.0-Volt DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3-Volt DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7-Volt DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
117
117
118
118
118
119
120
121
122
Chapter 13
Mechanical Specifications
13.1
13.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Quad Flat Pack (QFP) — Case 841B-01. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Chapter 14
Ordering Information
14.1
14.2
14.3
14.4
14.5
14.6
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MCU Ordering Forms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Application Program Media . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ROM Program Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ROM Verification Units (RVUs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MC Order Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
127
127
127
128
128
129
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
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Table of Contents
Appendix A
MC68HC705L16
A.1
A.2
A.3
A.4
A.5
A.6
A.7
A.7.1
A.7.2
A.7.3
A.8
A.9
A.10
A.10.1
A.10.2
A.11
A.12
A.12.1
A.12.2
A.12.3
A.13
A.13.1
A.13.2
A.13.3
A.13.4
A.14
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differences between MC68HC05L16 and MC68HC705L16 . . . . . . . . . . . . . . . . . . . . . . . . . .
MCU Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mask Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programming Voltage (VPP). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mode Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Single-Chip Mode (SCM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bootstrap Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Boot ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programming Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Program Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LCD 1/2 Duty and 1/2 Bias Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EPROM Programming Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.0-Volt DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3-Volt DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3-Volt and 5.0-Volt Control Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MC Order Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
131
131
131
131
133
133
135
135
135
136
136
137
137
137
138
139
140
140
141
141
141
141
142
143
144
144
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Chapter 1
General Description
1.1 Introduction
The MC68HC05L16 is an 80-pin microcontroller unit (MCU) with highly sophisticated on-chip peripheral
functions. The memory map includes 16 Kbytes of user ROM and 512 bytes of RAM. The MCU has five
parallel ports: A, B, C, D, and E. The MC68HC05L16 includes a timebase circuit, 8- and 16-bit timers, a
computer operating properly (COP) watchdog timer, liquid crystal display (LCD) drivers, and a simple
serial peripheral interface (SSPI).
1.2 Features
Features of the MC68HC05L16 MCU include:
• Low-cost HC05 core
• 16,400 Bytes of mask ROM, including 16 bytes of user vectors and 512 bytes of on-chip RAM
• 16 bidirectional input-output (I/O) lines
• Eight input-only lines
• 15 output-only lines, including 8-bit key wakeup interrupts
• Pullup resistors options
• Open-drain outputs options
• Two interrupt request (IRQ) inputs
• 16-bit timer with input capture and output compare (timer 1)
• 8-bit event counter/modulus clock divider (timer 2)
• Simple serial peripheral interface (SSPI)
• LCD drivers — 1-to-4 backplane drivers x 27-to-39 frontplane drivers
• On-chip timebase circuits with COP watchdog timer and timebase interrupts
• Dual oscillators and selectable system clock frequency
• Power-saving stop mode and wait mode
• 80-pin quad flat pack (QFP)
1.3 MCU Structure
Figure 1-1 shows the structure of the MC68HC05L16 MCU.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
13
General Description
XOSC1
XOSC2
³2
XOSC
INTERNAL
PROCESSOR
CLOCK
PORT A
DIV
SEL
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PORT B
OSC
DATA A
DIR REG
OSC1
OSC2
PB0/KWI0
PB1/KWI1
PB2/KWI2
PB3/KWI3
PB4/KWI4
PB5/KWI5
PB6/KWI6
PB7/KWI7
RESET
CPU
CONTROL
PORT C
MASK ROM
16,384 BYTES
+ 16 BYTES
DATA C
DIR REG
COP
SYSTEM
TIMER2
SELF-CHECK ROM
496 BYTES
SPI
SRAM
512 BYTES
DATA B
DIR REG
KEY WAKEUP
TIMEBASE
SYSTEM
PC0/SDI
PC1/SDO
PC2/SCK
PC3/TCAP
PC4/EVI
PC5/EVO
PC6*/IRQ2
PC7*/IRQ1
ALU
M68HC05 CPU
CPU REGISTERS
LCD
ACCUMULATOR
V
SS
PROGRAM COUNTER
PORT E
INDEX REGISTER
STACK POINTER
NDLY**
FP0–PF26
DRIVERS
FP27/PE7
FP28/PE6
FP29/PE5
FP30/PE4
FP31/PE3
FP32/PE2
FP33/PE1
FP34/PE0
PORT D
V
DD
FP35/PD7
FP36/PD6
FP37/PD5
FP38/PD4
BP3/PD3
BP2/PD2
BP1/PD1
BP0
CONDITION CODE REG
VLCD3
VLCD2
VLCD1
* Open Drain Only when Output
** The NDLY pin should be connected to VDD.
Figure 1-1. Block Diagram
NOTE
A line over a signal name indicates an active low signal. For example,
RESET is active low.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
14
Freescale Semiconductor
Mask Options
1.4 Mask Options
The three mask options on the MC68HC05L16 are:
1. RSTR: RESET pin pullup resistor
2. OSCR: OSC feedback resistor
3. XOSCR: XOSC feedback/damping resistor
See 2.4.6 Mask Option Status Register.
1.5 Functional Pin Description
FP27/PE7
FP26
FP25
FP24
FP23
FP22
FP21
FP20
FP19
FP18
FP17
FP16
FP15
FP14
FP13
FP12
FP11
FP10
FP9
FP8
The MC68HC05L16 is available in the 80-pin QFP. The pin assignment is shown in Figure 1-2.
80
61
1
20
60
21
40 41
VSS
FP7
FP6
FP5
FP4
FP3
FP2
FP1
FP0
BP0
BP1/PD1
BP2/PD2
BP3/PD3
VDD
PC7*/IRQ1
PC6*/IRQ2
PC5/EVO
PC4/EVI
PC3/TCAP
PC2/SCK
OSC1
OSC2
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PB0/KWI0
PB1/KWI1
PB2/KWI2
PB3/KWI3
PB4/KWI4
PB5/KWI5
PB6/KWI6
PB7/KWI7
PC0/SDI
PC1/SDO
VDD
FP28/PE6
FP29/PE5
FP30/PE4
FP31/PE3
FP32/PE2
FP33/PE1
FP34/PE0
FP35/PD7
FP36/PD6
FP37/PD5
FP38/PD4
VLCD3
VLCD2
VLCD1
VSS
NDLY**
XOSC1
XOSC2
RESET
* Open Drain Only when Output
** The NDLY pin should be connected to VDD.
Figure 1-2. Pin Assignment for Single-Chip Mode
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
15
General Description
Table 1-1. Pin Configuration
Pin
Number
SCM,
Self-Check
I/O
Pin
Number
SCM,
Self-Check
I/O
23
24
25
26
27
28
29
30
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
52
53
54
55
56
57
58
59
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
FP0
FP1
FP2
FP3
FP4
FP5
FP6
FP7
FP8
FP9
FP10
FP11
FP12
FP13
FP14
FP15
FP16
FP17
FP18
FP19
FP20
FP21
FP22
FP23
FP24
FP25
FP26
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
31
32
33
34
35
36
37
38
PB0/KWI0
PB1/KWI1
PB2/KWI2
PB3/KWI3
PB4/KWI4
PB5/KWI5
PB6/KWI6
PB7/KWI7
I
I
I
I
I
I
I
I
39
40
41
42
43
44
45
46
PC0/SDI
PC1/SDO
PC2/SCK
PC3/TCAP
PC4/EVI
PC5/EVO
PC6*/IRQ2
PC7*/IRQ1
I/O
I/O
I/O
I/O
I/O
I/O
I
I
17
NDLY**
47
1
60
16
21
22
18
19
VDD
VDD
VSS
VSS
OSC1
OSC2
XOSC1
XOSC2
I
I
O
O
I
O
I
O
80
2
3
4
5
6
7
8
FP27/PE7
FP28/PE6
FP29/PE5
FP30/PE4
FP31/PE3
FP32/PE2
FP33/PE1
FP34/PE0
O
O
O
O
O
O
O
O
15
14
13
48
49
50
51
VLCD1
VLCD2
VLCD3
BP3/PD3
BP2/PD2
BP1/PD1
BP0
I
I
I
O
O
O
O
9
10
11
12
FP35/PD7
FP36/PD6
FP37/PD5
FP38/PD4
O
O
O
O
* Open Drain Only when Output
** The NDLY pin should be connected to VDD.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
16
Freescale Semiconductor
Functional Pin Description
1.5.1 VDD and VSS
Power is supplied to the MCU through VDD and VSS. VDD is the positive supply, and VSS is ground. The
MCU operates from a single power supply. Very fast signal transitions occur on the MCU pins. The short
rise and fall times place very high short-duration current demands on the power supply. To prevent noise
problems, special care should be taken to provide good power supply bypassing at the MCU by using
bypass capacitors with good high-frequency characteristics that are positioned as close to the MCU as
possible. Bypassing requirements vary, depending on how heavily the MCU pins are loaded.
1.5.2 OSC1 and OSC2
The OSC1 and OSC2 pins are the connections for the 2-pin on-chip oscillator. The OSC1 and OSC2 pins
can accept:
• A crystal as shown in Figure 1-3(a)
• An external clock signal as shown in Figure 1-3(b)
The frequency, fOSC, of the oscillator or external clock source is divided by 64 to produce the internal
operating frequency, fOP, by default.
1.5.2.1 Crystal or Ceramic Resonator
The circuit in Figure 1-3(a) shows a typical 2-pin oscillator circuit for an AT-cut, parallel resonant crystal.
The crystal manufacturer’s recommendations should be followed, as the crystal parameters determine
the external component values required to provide maximum stability and reliable startup. The load
capacitance values used in the oscillator circuit design should include all stray capacitances. The crystal
and components should be mounted as close as possible to the pins for startup stabilization and to
minimize output distortion. An internal startup feedback resistor of ROF between OSC1 and OSC2 may
be selected as a mask option for MC68HC05L16. Typical ROF resistor value is 5.5 MΩ.
MCU
ROF
MASK OPTIONS
MCU
OSC1
OSC2
4 MHz (TYP)
OSC1
OSC2
UNCONNECTED
CO1
CO2
EXTERNAL CLOCK
(a) Crystal Connections
(b) External Clock
Source Connection
Figure 1-3. Oscillator Connections
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
17
General Description
1.5.2.2 External Clock
An external clock from another CMOS-compatible device can be connected to the OSC1 input, with the
OSC2 input not connected, as shown in Figure 1-3. This configuration is possible regardless of how the
oscillator is set up.
1.5.3 XOSC1 and XOSC2
The XOSC1 and XOSC2 pins are the connections for the 2-pin on-chip oscillator. The XOSC1 and
XOSC2 pins can accept:
• A crystal as shown in Figure 1-4(a)
• An external clock signal as shown in Figure 1-4(b)
The frequency, fOSC, of the oscillator or external clock source is divided by two to produce the internal
operating frequency, fOP, if selected by SYS1–SYS0 bits.
When XOSC is not used, the XOSC1 pin must be connected to the RESET pin to ensure proper
initialization of the clock circuitry. XOSC2 pin should remain unconnected.
1.5.3.1 Crystal Resonator
The circuit in Figure 1-4(a) shows a typical 2-pin oscillator circuit for an AT-cut, parallel resonant crystal.
The crystal manufacturer’s recommendations should be followed, as the crystal parameters determine
the external component values required to provide maximum stability and reliable startup. The load
capacitance values used in the oscillator circuit design should include all stray capacitances. The crystal
and components should be mounted as close as possible to the pins for startup stabilization and to
minimize output distortion. An internal startup feedback resistor of RXOF between XOSC1 and XOSC2
and a damping resistor of RXOD in series to XOSC2 may be selected as a mask option. Typical RXOF
resistor value is 15 MΩ, and RXOD resistor value is 1 MΩ.
MCU
RXOF
MASK OPTIONS
MCU
RXOD
XOSC1
XOSC2
XOSC1
XOSC2
32.768 kHz (TYP)
UNCONNECTED
CXO1
CXO2
EXTERNAL CLOCK
(a) Crystal Connections
(b) External Clock
Source Connection
Figure 1-4. Oscillator Connections
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
18
Freescale Semiconductor
Functional Pin Description
1.5.3.2 External Clock
An external clock from another CMOS-compatible device can be connected to the XOSC1 input, with the
XOSC2 input not connected, as shown in Figure 1-4(b). This configuration is possible regardless of how
the oscillator is set up.
1.5.4 RESET
This pin can be used as an input to reset the MCU to a known startup state by pulling it to the low state.
When power is removed, the RESET pin contains a steering diode to discharge any voltage on the pin to
VDD. The RESET pin contains an internal Schmitt trigger to improve its noise immunity as an input. An
internal RESET pin pullup resistor may be selected as a mask option. A typical pullup resistor value is 46
kΩ.
1.5.5 Port A (PA0–PA7)
Port A is an 8-bit I/O port. The state of any pin is software programmable and all port A lines are configured
as inputs during power-on or reset. Port A outputs may be configured as open-drain outputs and
connected to a pullup resistor by software option.
1.5.6 Port B (PB0–PB7/KWI0–KWI7)
Port B is an 8-bit input-only port that shares its lines with the key wakeup interrupt (KWI) system. Port B
has a pullup option by software option.
1.5.7 Port C (PC0/SDI, PC1/SDO, PC2/SCK, PC3/TCAP, PC4/EVI,
PC5/EVO, PC6/IRQ2, and PC7/IRQ1)
Port C is an 8-bit I/O port. The state of any pin is software programmable and all port C lines are
configured as inputs during power-on or reset. All port C lines may connect to a pullup resistor by software
option.
• Bits PC0–PC2 are shared with the SSPI subsystem and may be configured as open-drain outputs.
• Bit 3 is shared with the TCAP pin of timer 1 and may be configured as an open-drain output.
• Bit 4 is shared with the EVI bit of timer 2 and may be configured as an open-drain output.
• Bit 5 is shared with the EVO bit of timer 2 and may be configured as an open-drain output.
• Bit 6 is shared with the IRQ2 input. This bit is an open-drain output-only pin configured as an
output.
• Bit 7 is shared with the IRQ1 input. This bit is an open-drain output-only pin configured as an
output.
1.5.8 Port D (PD1–PD3/BP1–BP3 and PD4–PD7/FP34–FP27)
Port D is a 7-bit output-only port that shares its bits with the LCD backplane/frontplane drivers. Port D lines
are configured as LCD outputs during power-on or reset. PD1–PD3 and PD4–PD7 outputs may be
configured as open-drain outputs by a software option.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
19
General Description
1.5.9 Port E (PE0–PE7/FP38–FP35)
Port E is an 8-bit output-only port that shares its bits with LCD frontplane drivers. Port E lines are
configured as LCD outputs during power-on or reset. PE0–PE3 and PE4–PE7 outputs may be configured
as open-drain outputs by a software option.
1.5.10 VLCD1, VLCD2, and VLCD3
These pins provide offset to the LCD driver bias for adjusting the contrast of the LCD.
1.5.11 NDLY
This pin is reserved for factory test and should be connected to VDD in single-chip mode (user mode).
1.6 Modes of Operation
The MC68HC05L16 has two operating modes:
• Single-chip mode (SCM)
• Self-check mode
Single-chip mode, also called user mode, allows maximum use of pins for on-chip peripheral functions.
The self-check capability of MC68HC05L16 provides an internal check to determine if the device is
functional.
1.6.1 Mode Entry
Mode entry is done at the rising edge of the RESET pin. Once the device enters one of the modes, the
mode cannot be changed by software. Only an external reset can change the mode.
At the rising edge of the RESET pin, the device latches the states of IRQ1 and IRQ2 and places itself in
the specified mode. While the RESET pin is low, all pins are configured as single-chip mode. Table 1-2
shows the states of IRQ1 and IRQ2 for each mode entry.
High voltage VTST = 2 x VDD is required to select modes other than single-chip mode.
Table 1-2. Mode Select Summary
Modes
Single-Chip (User) Mode
Self-Check Mode
RESET
PC6/IRQ1
PC7/IRQ2
VSS or VDD
VSS or VDD
VTST
VDD
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
20
Freescale Semiconductor
Modes of Operation
SINGLE-CHIP MODE
VDD
RESET
VSS
VTST
VDD
IRQ1
VSS
VDD
IRQ2
VSS
VTST = 2 x VDD
Figure 1-5. Mode Entry Diagram
1.6.2 Single-Chip Mode (SCM)
In this mode, all address and data bus activity occurs within the MCU. Thus, no external pins are required
for these functions. The single-chip mode allows the maximum number of I/O pins for on-chip peripheral
functions, for example, ports A through E, and LCD drivers.
1.6.3 Self-Check Mode
In this mode, the reset vector is fetched from a 496-byte internal self-check ROM at $FE00–$FFEF. The
self-check ROM contains a self-check program to test the functions of internal modules.
Since this mode is not a normal user mode, all of the privileged control bits are accessible. This allows
the self-check mode to be used for self- test of the device.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
21
General Description
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
22
Freescale Semiconductor
Chapter 2
Memory Map
2.1 Introduction
The MC68HC05L16 contains a 16,384-byte mask ROM, 496 bytes of self-check ROM, and 512 bytes of
RAM. An additional 16 bytes of mask ROM are provided for user vectors at $FFF0–$FFFF.
The MCU’s memory map is shown in Figure 2-1.
0
$0000
RAM
512 BYTES
$00C0
$00FF
DUAL-MAPPED
I/O REGISTERS
16 BYTES
63
64
$003F
$0040
STACK 64 BYTES
$023F
$0240
191
192
255
256
575
576
0000
$0000
I/O
64 BYTES
$000F
$0010
0015
0016
I/O
48 BYTES
UNUSED
4095
4096
$0FFF
$1000
$003F
MASK ROM
16 KBYTES
0063
20479
20480
$4FFF
$5000
UNUSED
65023
65024
$FDFF
$FE00
SELF-CHECK ROM
496 BYTES
$FFDF
$FFE0
$FFEF
$FFF0
$FFFF
TEST VECTORS
USER VECTORS
65503
65504
65519
65520
65535
Figure 2-1. Memory Map
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
23
Memory Map
2.2 Input/Output and Control Registers
The input/output (I/O) and control registers reside in locations $0000–$003F. A summary of these
registers is shown in Figure 2-3. The bit assignments for each register are shown in Figure 2-4. Reading
from unimplemented bits (denoted by shading) will return unknown states (unless explicitly defined to
read 0), and writing to unimplemented bits will have no effect. See also Figure 2-2.
Register Address (Main map unless otherwise specified)
Register Name (Full)
Read
$003E
Read:
Miscellaneous Register Write:
(MISC)
Reset:
Write
Register Name (Mnemonic)
Bit Name (Mnemonic)
Read-Only Bit
FTUP
STUP
0
0
*
*
0
0
Reset Value
SYS1
SYS0
FOSCE
OPTM
1
0
1
0
Read/Write Bit
Figure 2-2. Register Description Key
2.2.1 Read/Write Bits
Read/write bits are typically control bits. They are, in general, not modified by a module. Reset indicates
the initial value of the latch.
2.2.2 Read-Only Bits
Read-only bits are status flag bits. They are indicators of module status. Reset indicates the value that
will be read immediately after system reset or before the module is enabled.
2.2.3 Write-Only Bits
Write-only bits are control bits. They typically return a state of 0 to prevent an inadvertent write to this bit
by a READ-MODIFY-WRITE instruction. Reset indicates the value that will be read immediately after
system reset, which is the forced read value (typically 0).
2.2.4 Reserved Bits
Reserved bits are read-only bits that typically read 0. Writes to these bits are ignored, and the user should
not write 1 for future compatibility. Reset indicates the value that will be read immediately after system
reset which is the forced read value (typically 0).
2.2.5 Reset Value
Values specified on the row marked Reset: are initial values of register bits after system reset. Those bits
unaffected by reset are marked with the letter U. Those bits that are unaffected by reset but initialized by
power-on reset are marked with an asterisk (*).
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
24
Freescale Semiconductor
Summary of Internal Registers and I/O Map
2.2.6 Option Map
Address locations $0000–$000F are dual mapped. When the OPTM bit in the MISC register is cleared,
the main address map is accessed. When the OPTM bit in the MISC register is set, the option address
map is accessed.
NOTE
Although not necessary for this device, for future compatibility the OPTM bit
should be cleared when accessing memory locations $0010 and above.
2.3 Summary of Internal Registers and I/O Map
Figure 2-3 contains a detailed memory map of the I/O registers.
Addr.
$0000
$0001
Register Name
Port A Data Register Read:
(PORTA) Write:
See page 52. Reset:
Port B Data Register Read:
(PORTB) Write:
See page 53. Reset:
$0002
Port C Data Register Read:
(PORTC) Write:
See page 54. Reset:
$0003
Port D Data Register Read:
(PORTD) Write:
See page 56. Reset:
$0004
6
5
4
3
2
1
Bit 0
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
PB2
PB1
PB0
PC2
PC1
PC0
Unaffected by reset
PB7
PB6
PB5
PB4
PB3
Unaffected by reset
PC7
PC6
PC5
PC4
PC3
Unaffected by reset
PD7
PD6
PD5
PD4
PD3
PD2
PD1
1
1
1
1
1
1
1
1
1
PE7
PE6
PE5
PE4
PE3
PE2
PE1
PE0
1
1
1
1
1
1
1
1
Reserved
R
R
R
R
R
R
R
R
Reserved
R
R
R
R
R
R
R
R
IRQ1E
IRQ2E
0
KWIE
IRQ1S
IRQ2S
0
0
0
Port E Data Register Read:
(PORTE) Write:
See page 57. Reset:
$0005
Bit 7
↓
$0007
$0008
Interrupt Control Register Read:
(INTCR) Write:
See page 45. Reset:
$0009
Interrupt Status Register Read:
(INTSR) Write:
See page 46. Reset:
$000A
Serial Peripheral Control Register Read:
(SPCR) Write:
See page 73. Reset:
0
0
0
0
0
0
IRQ1F
IRQ2F
0
KWIF
0
0
RIRQ1
RIRQ2
0
0
0
RKWIF
0
0
0
0
0
0
0
0
SPIE
SPE
DORD
MSTR
0
0
0
SPR
0
0
0
0
0
0
0
0
= Unimplemented
R
= Reserved
U = Unaffected
Figure 2-3. Main I/O Map (Sheet 1 of 5)
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
25
Memory Map
Addr.
$000B
$000C
$000D
Register Name
Serial Peripheral Status Register Read:
(SPSR) Write:
See page 74. Reset:
Serial Peripheral Data Register (SP- Read:
DR) Write:
See page 75. Reset:
Bit 7
6
5
4
3
2
1
Bit 0
SPIF
DCOL
0
0
0
0
0
0
0
0
0
0
0
0
0
0
MSB
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 2
LSB
Unaffected by reset
Reserved
R
R
R
R
R
R
R
R
Reserved
R
R
R
R
R
R
R
R
TBCLK
0
LCLK
0
0
0
T2R1
T2R0
0
0
0
0
0
0
0
0
TBIE
TBR1
TBR0
0
0
COPE
COPC
0
0
1
1
0
0
0
0
ICIE
OC1IE
TOIE
0
0
0
IEDG
OLVL
0
0
0
0
0
0
U
0
ICF
OC1F
TOF
0
0
0
0
0
U
U
U
0
0
0
0
0
Input Capture Register High Read:
(ICH) Write:
See page 80. Reset:
BIT 15
BIT 14
BIT 13
BIT 12
BIT 11
BIT 10
BIT 9
BIT 8
BIT 7
BIT 2
BIT 1
BIT 0
$0015
Input Capture Register Low Read:
(ICL) Write:
See page 80. Reset:
$0016
Output Compare Register 1 High Read:
(OC1H) Write:
See page 79. Reset:
BIT 10
BIT 9
BIT 8
BIT 2
BIT 1
BIT 0
BIT 10
BIT 9
BIT 8
↓
$000F
$0010
Timebase Control Register 1 Read:
(TBCR1) Write:
See page 88. Reset:
$0011
Timebase Control Register 2 Read:
(TBCR2) Write:
See page 88. Reset:
$0012
Timer Control Register Read:
(TCR) Write:
See page 80. Reset:
$0013
$0014
$0017
$0018
Timer Status Register Read:
(TSR) Write:
See page 81. Reset:
Output Compare Register 1 Low Read:
(OC1L) Write:
See page 79. Reset:
Timer Counter Register High Read:
(TCNTH) Write:
See page 88. Reset:
TBIF
0
RTBIF
0
Unaffected by reset
BIT 6
BIT 5
BIT 4
BIT 3
Unaffected by reset
BIT 15
BIT 14
BIT 13
BIT 12
BIT 11
Unaffected by reset
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
Unaffected by reset
BIT 15
BIT 14
BIT 13
BIT 12
BIT 11
Unaffected by reset
= Unimplemented
R
= Reserved
U = Unaffected
Figure 2-3. Main I/O Map (Sheet 2 of 5)
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
26
Freescale Semiconductor
Summary of Internal Registers and I/O Map
Addr.
$0019
$001A
$001B
Register Name
Timer Counter Register Low Read:
(TCNTL) Write:
See page 88. Reset:
Alternate Timer Counter Register Read:
High (ACNTH) Write:
See page 79. Reset:
Alternate Timer Counter Register Read:
Low (ACMTL) Write:
See page 79. Reset:
$001C
Timer Control Register 2 Read:
(TCR2) Write:
See page 85. Reset:
$001D
Timer Status Register 2 Read:
(TSR2) Write:
See page 87. Reset:
$001E
$001F
Output Compare Register 2 Read:
(OC2) Write:
See page 87. Reset:
Timer Counter Register 2 Read:
(TCNT2) Write:
See page 88. Reset:
$0020
LCD Control Register Read:
(LCDCR) Write:
See page 100. Reset:
$0021
LCD Data Register 1 Read:
(LCDR1) Write:
See page 101. Reset:
$0022
$0023
$0024
LCD Data Register 2 Read:
(LCDR2) Write:
See page 101. Reset:
LCD Data Register 3 Read:
(LCDR3) Write:
See page 101. Reset:
LCD Data Register 4 Read:
(LCDR4) Write:
See page 101. Reset:
Bit 7
6
5
4
3
2
1
Bit 0
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
BIT 10
BIT 9
BIT 8
BIT 2
BIT 1
BIT 0
IL2
OE2
OL2
0
0
0
0
Unaffected by reset
BIT 15
BIT 14
BIT 13
BIT 12
BIT 11
Unaffected by reset
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
Unaffected by reset
TI2IE
OC2IE
0
T2CLK
0
0
0
0
TI2F
OC2F
0
0
IM2
0
0
0
0
RTI2F
ROC2F
0
0
0
0
0
0
0
0
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
0
0
0
0
0
0
0
0
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
0
0
0
0
0
0
0
1
LCDE
DUTY1
DUTY0
0
PEH
PEL
PDH
0
0
0
0
0
0
0
0
0
F1B3
F1B2
F1B1
F1B0
F0B3
F0B2
F0B1
F0B0
F2B2
F2B1
F2B0
F4B2
F4B1
F4B0
F6B2
F6B1
F6B0
Unaffected by reset
F3B3
F3B2
F3B1
F3B0
F2B3
Unaffected by reset
F5B3
F5B2
F5B1
F5B0
F4B3
Unaffected by reset
F7B3
F7B2
F7B1
F7B0
F6B3
Unaffected by reset
= Unimplemented
R
= Reserved
U = Unaffected
Figure 2-3. Main I/O Map (Sheet 3 of 5)
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
27
Memory Map
Addr.
$0025
$0026
$0027
Register Name
LCD Data Register 5 Read:
(LCDR5) Write:
See page 101. Reset:
LCD Data Register 6 Read:
(LCDR6) Write:
See page 101. Reset:
LCD Data Register 7 Read:
(LCDR7) Write:
See page 101. Reset:
$0028
LCD Data Register 8 Read:
(LCDR8) Write:
See page 101. Reset:
$0029
LCD Data Register 9 Read:
(LCDR9) Write:
See page 101. Reset:
$002A
$002B
LCD Data Register 10 Read:
(LCDR10) Write:
See page 101. Reset:
LCD Data Register 11 Read:
(LCDR11) Write:
See page 101. Reset:
$002C
LCD Data Register 12 Read:
(LCDR12) Write:
See page 101. Reset:
$002D
LCD Data Register 13 Read:
(LCDR13) Write:
See page 101. Reset:
$002E
$002F
$0030
LCD Data Register 14 Read:
(LCDR14) Write:
See page 101. Reset:
LCD Data Register 15 Read:
(LCDR15) Write:
See page 101. Reset:
LCD Data Register 16 Read:
(LCDR16) Write:
See page 101. Reset:
Bit 7
6
5
4
3
2
1
Bit 0
F9B3
F9B2
F9B1
F9B0
F8B3
F8B2
F8B1
F8B0
F10B2
F10B1
F10B0
F12B2
F12B1
F12B0
F14B2
F14B1
F14B0
F16B2
F16B1
F16B0
F18B2
F18B1
F18B0
F20B2
F20B1
F20B0
F22B2
F22B1
F22B0
F24B2
F24B1
F24B0
F26B2
F26B1
F26B0
F28B2
F28B1
F28B0
F30B2
F30B1
F30B0
Unaffected by reset
F11B3
F11B2
F11B1
F11B0
F10B3
Unaffected by reset
F13B3
F13B2
F13B1
F13B0
F12B3
Unaffected by reset
F15B3
F15B2
F15B1
F15B0
F14B3
Unaffected by reset
F17B3
F17B2
F17B1
F17B0
F16B3
Unaffected by reset
F19B3
F19B2
F19B1
F19B0
F18B3
Unaffected by reset
F21B3
F21B2
F21B1
F21B0
F20B3
Unaffected by reset
F23B3
F23B2
F23B1
F23B0
F22B3
Unaffected by reset
F25B3
F25B2
F25B1
F25B0
F24B3
Unaffected by reset
F27B3
F27B2
F27B1
F27B0
F26B3
Unaffected by reset
F29B3
F29B2
F29B1
F29B0
F28B3
Unaffected by reset
F31B3
F31B2
F31B1
F31B0
F30B3
Unaffected by reset
= Unimplemented
R
= Reserved
U = Unaffected
Figure 2-3. Main I/O Map (Sheet 4 of 5)
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
28
Freescale Semiconductor
Option Map for I/O Configurations
Addr.
$0031
$0032
$0033
$0034
Register Name
LCD Data Register 17 Read:
(LCDR17) Write:
See page 101. Reset:
LCD Data Register 18 Read:
(LCDR18) Write:
See page 101.
Reset:
LCD Data Register 19 Read:
(LCDR19) Write:
See page 101. Reset:
LCD Data Register 20 Read:
(LCDR20) Write:
See page 101. Reset:
$0035
Bit 7
6
5
4
3
2
1
Bit 0
F33B3
F33B2
F33B1
F33B0
F32B3
F32B2
F32B1
F32B0
F34B2
F34B1
F34B0
F36B2
F36B1
F36B0
F38B2
F38B1
F38B0
Unaffected by reset
F35B3
F35B2
F35B1
F35B0
F34B3
Unaffected by reset
F37B3
F37B2
F37B1
F37B0
F36B3
Unaffected by reset
0
0
0
0
F38B3
Unaffected by reset
Reserved
R
R
R
R
R
R
R
R
Reserved
R
R
R
R
R
R
R
R
FTUP
STUP
0
0
SYS1
SYS0
FOSCE
OPTM
*
*
0
0
1
0
1
0
R
R
R
R
R
R
R
R
↓
$003D
$003E
Miscellaneous Register Read:
(MISC) Write:
See page 67. Reset:
$003F
Reserved
* Unaffected by reset but initialized by power-on reset
= Unimplemented
R
= Reserved
U = Unaffected
Figure 2-3. Main I/O Map (Sheet 5 of 5)
2.4 Option Map for I/O Configurations
Most of the I/O configurations are done in the option map (Figure 2-4). Some options still remain as mask
options for the MC68HC05L16 such as a pullup resistor for the RESET pin and resistors for the
OSC1/OSC2 and XOSC1/XOSC2 pins. These mask options may be read by the MOSR ($000F) in the
option map.
The option map is located at $0000–$000F of the main memory map and it is available when the OPTM
bit in the MISC register ($003E) is set. Main registers at $0000–$000F are not available when OPTM = 1.
I/O port data direction registers are contained in the option map in Figure 2-4.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
29
Memory Map
Addr.
$0000
$0001
Register Name
Port A Data Direction Register Read:
(DDRA) Write:
See page 52. Reset:
Reserved
$0002
Port C Data Direction Register Read:
(DDRC) Write:
See page 55. Reset:
$0003
Port D MUX Register Read:
(PDMUX) Write:
See page 56. Reset:
$0004
$0005
Port E MUX Register Read:
(PEMUX) Write:
See page 57. Reset:
Bit 7
6
5
4
3
2
1
Bit 0
DDRA7
DDRA6
DDRA5
DDRA4
DDRA3
DDRA2
DDRA1
DDRA0
0
0
0
0
0
0
0
0
R
R
R
R
R
R
R
R
DDRC7
DDRC6
DDRC5
DDRC4
DDRC3
DDRC2
DDRC1
DDRC0
0
0
0
0
0
0
0
0
PDM7
PDM6
PDM5
PDM4
0
0
0
0
0
0
0
0
0
0
0
0
PEM7
PEM6
PEM5
PEM4
PEM3
PEM2
PEM1
PEM0
0
0
0
0
0
0
0
0
Reserved
R
R
R
R
R
R
R
R
Reserved
R
R
R
R
R
R
R
R
0
0
0
0
RBH
RBL
RAH
RAL
0
0
0
0
0
0
0
0
RC7
RC6
RC5
RC4
RC3
RC2
RC1
RC0
0
0
0
0
0
0
0
0
DWOML
EWOMH
EWOML
0
0
AWOMH
AWOML
0
0
0
0
0
0
0
1
CWOM5
CWOM4
CWOM3
CWOM2
CWOM1
CWOM0
↓
$0007
$0008
Resistor Control Register 1 Read:
(RCR1) Write:
See page 31. Reset:
$0009
Resistor Control Register 2 Read:
(RCR2) Write:
See page 31. Reset:
$000A
Open-Drain Output Control Read: DWOMH
Register 1 (WOM1) Write:
See page 32. Reset:
0
$000B
Open-Drain Output Control Read:
Register 2 (WOM2) Write:
See page 32. Reset:
1
1
1
0
0
0
0
0
0
$000C
Reserved
R
R
R
R
R
R
R
R
$000D
Reserved
R
R
R
R
R
R
R
R
KWIE7
KWIE6
KWIE5
KWIE4
KWIE3
KWIE2
KWIE1
KWIE0
$000E
Key Wakeup Input Enable Register Read:
(KWIEN) Write:
See page 33. Reset:
$000F
Mask Option Status Register Read:
(MOSR) Write:
See page 33. Reset:
0
0
0
0
0
0
0
0
RSTR
OSCR
XOSCR
0
0
0
0
0
U
U
U
0
0
0
0
0
= Unimplemented
R
= Reserved
U = Unaffected
Figure 2-4. Option Map
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
30
Freescale Semiconductor
Option Map for I/O Configurations
2.4.1 Resistor Control Register 1
Address:
Read:
Write:
Reset:
Option Map — $0008
Bit 7
6
5
4
3
2
1
Bit 0
0
0
0
0
RBH
RBL
RAH
RAL
0
0
0
0
0
0
0
0
Figure 2-5. Resistor Control Register 1 (RCR1)
Bits 7–4 — Reserved
These bits are not used and always read as logic 0.
RBH — Port B Pullup Resistor (H)
When this bit is set, pullup resistors are connected to the upper four bits of port B. This bit is cleared
on reset.
RBL — Port B Pullup Resistor (L)
When this bit is set, pullup resistors are connected to the lower four bits of port B. This bit is cleared
on reset.
RAH — Port A Pullup Resistor (H)
When this bit is set, pullup resistors are connected to the upper four bits of port A. This bit is cleared
on reset.
RAL — Port A Pullup Resistor (L)
When this bit is set, pullup resistors are connected to the lower four bits of port A. This bit is cleared
on reset.
2.4.2 Resistor Control Register 2
Address:
Read:
Write:
Reset:
Option Map — $0009
Bit 7
6
5
4
3
2
1
Bit 0
RC7
RC6
RC5
RC4
RC3
RC1
RC1
RC0
0
0
0
0
0
0
0
0
Figure 2-6. Resistor Control Register 2 (RCR2)
RCx — Port C Pullup Resistor (Bitx)
When RCx bit is set, the pullup resistor is connected to the corresponding bit of port C. This bit is
cleared on reset.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
31
Memory Map
2.4.3 Open-Drain Output Control Register 1
Address:
Read:
Write:
Reset:
Option Map — $000A
Bit 7
6
5
4
3
2
1
Bit 0
DWOMH
DWOML
EWOMH
EWOML
0
0
AWOMH
AWOML
0
0
0
0
0
0
0
0
Figure 2-7. Open-Drain Output Control Register 1 (WOM1)
DWOMH — Port D Open-Drain Mode (H)
When this bit is set, the upper four bits of port D are configured as open-drain outputs if these bits are
selected as port D output by the PDH bit in the LCDCR. This bit is cleared on reset.
DWOML — Port D Open-Drain Mode (L)
When this bit is set, the lower three bits of port D are configured as open-drain outputs if the
corresponding BPx pin is not used by the LCD driver. This bit is cleared on reset.
EWOMH — Port E Open-Drain Mode (H)
When this bit is set, the upper four bits of port E (that are configured as I/O output by the PEH bit in
the LCDCR) are configured as open-drain outputs. This bit is cleared on reset.
EWOML — Port E Open-Drain Mode (L)
When this bit is set, the lower four bits of port E (that are configured as I/O output by the PEL bit in the
LCDCR) are configured as open-drain outputs. This bit is cleared on reset.
Bits 3 and 2 — Reserved
These bits are not used and always return to logic 0.
AWOMH — Port A Open-Drain Mode (H)
When this bit is set, the upper four bits of port A that are configured as output (corresponding to the
DDRA bit set) become open-drain outputs. This bit is cleared on reset.
AWOML — Port E Open-Drain Mode (L)
When this bit is set, the lower four bits of port A that are configured as output (corresponding DDRA
bit set) become open-drain outputs. This bit is cleared on reset.
2.4.4 Open-Drain Output Control Register 2
Address:
Read:
Write:
Reset:
Option Map — $000B
Bit 7
6
5
4
3
2
1
Bit 0
1
1
CWOM5
CWOM4
CWOM3
CWOM2
CWOM1
CWOM0
1
1
0
0
0
0
0
0
Figure 2-8. Open-Drain Output Control Register 2 (WOM2)
Bits 7 and 6 — Reserved
These bits are not used and always read as logic 1. When configured as output, PC6 and PC7 are
always open drain.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
32
Freescale Semiconductor
Option Map for I/O Configurations
CWOMx — Port C Open-Drain Mode (Bitx)
When CWOMx bit is set, port C bits x are configured as open-drain outputs if DDRCx is set. This bit is
cleared on reset.
2.4.5 Key Wakeup Input Enable Register
Address:
Read:
Write:
Reset:
Option Map — $000E
Bit 7
6
5
4
3
2
1
Bit 0
KWIE7
KWIE6
KWIE5
KWIE4
KWIE3
KWIE2
KWIE1
KWIE0
0
0
0
0
0
0
0
0
Figure 2-9. Key Wakeup Input Enable Register (KWIEN)
KWIEx — Key Wakeup Input Enable (Bitx)
When KWIEx bit is set, the KWIx (PBx) input is enabled for key wakeup interrupt. This bit is cleared on
reset.
2.4.6 Mask Option Status Register
The mask option status register (MOSR) indicates the state of mask options specified prior to production
of the MC68HC05L16.
Address:
Read:
Option Map — $000F
Bit 7
6
5
4
3
2
1
Bit 0
RSTR
OSCR
XOSCR
0
0
0
0
0
U
U
0
0
0
0
0
Write:
Reset:
U
= Unimplemented
U = Unaffected
Figure 2-10. Mask Option Status Register (MOSR)
RSTR — RESET Pin Pullup Resistor
When this bit is set, it indicates an internal pullup resistor is attached to the RESET pin by mask option.
OSCR — OSC Feedback Resistor
When this bit is set, it indicates that an internal feedback resistor is attached between OSC1 and OSC2
by mask option.
XOSCR — OSC Feedback Resistor
When this bit is set, it indicates that an internal feedback resistor is attached between XOSC1 and
XOSC2. The damping resistor at the XOSC2 pin is attached by mask option.
Bits 4–0 — Reserved
These bits are not used and always read as logic 0.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
33
Memory Map
2.5 RAM
The 512-byte internal RAM is positioned at $0040–$023F in the memory map. The lower 192 bytes are
positioned in the page zero which are accessible by the direct addressing mode. The upper 64 bytes of
this area (page zero) are used for the CPU stack. Care should be taken if the stack area is used for data
storage.
The remaining 320 bytes of RAM, $0100–$023F, are accessed by extended addressing mode.
The RAM is implemented with static cells and retains its contents during the stop and wait modes.
2.6 Self-Check ROM
Self-check ROM is 496 bytes of mask ROM positioned at $FE00–$FFEF. This ROM contains self-check
programs and reset/interrupt vectors in the self-check mode.
2.7 Mask ROM
The 16,384-byte user ROM is positioned at $1000–$4FFF, and an additional 16 bytes of ROM are located
at $FFF0–$FFFF for user vectors.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
34
Freescale Semiconductor
Chapter 3
Central Processor Unit (CPU)
3.1 Introduction
This section describes the central processor unit (CPU).
3.2 CPU Registers
The MCU contains five registers as shown in Figure 3-1. The interrupt stacking order is shown in
Figure 3-2.
7
0
ACCUMULATOR
A
7
0
INDEX REGISTER
X
15
0
PROGRAM COUNTER
PC
15
0
0
0
0
0
0
0
0
7
1
0
1
STACK POINTER
SP
H
I
CCR
N Z
CONDITION CODE
REGISTER
C
Figure 3-1. Programming Model
7
1
INCREASING
MEMORY
ADDRESSES
R
E
T
U
R
N
0
1
1
CONDITION CODE
REGISTER
ACCUMULATOR
INDEX REGISTER
PCH
PCL
STACK
I
N
T
E
R
R
U
P
T
DECREASING
MEMORY
ADDRESSES
UNSTACK
NOTE:
Since the stack pointer decrements during pushes, the PCL is stacked first,
followed by PCH, etc. Pulling from the stack is in the reverse order.
Figure 3-2. Stacking Order
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
35
Central Processor Unit (CPU)
3.3 Accumulator
The accumulator (A) is a general-purpose, 8-bit register used to hold operands and results of arithmetic
calculations or data manipulations.
7
0
A
3.4 Index Register
The index register (X) is an 8-bit register used for the indexed addressing value to create an effective
address. The index register may also be used as a temporary storage area.
7
0
X
3.5 Condition Code Register
The condition code register (CCR) is a 5-bit register in which the H, N, Z, and C bits are used to indicate
the results of the instruction just executed, and the I bit is used to enable or disable interrupts. These bits
can be tested individually by a program, and specific actions can be taken as a result of their state. Each
bit is explained in the following paragraphs.
CCR
H
I
N
Z
C
Half Carry (H)
This bit is set during ADD and ADC operations to indicate that a carry occurred between bits 3 and 4.
Interrupt (I)
When this bit is set, the timer and external interrupt are masked (disabled). If an interrupt occurs while
this bit is set, the interrupt is latched and processed as soon as the I bit is cleared.
Negative (N)
When set, this bit indicates that the result of the last arithmetic, logical, or data manipulation was
negative.
Zero (Z)
When set, this bit indicates that the result of the last arithmetic, logical, or data manipulation was zero.
Carry/Borrow (C)
When set, this bit indicates that a carry or borrow out of the arithmetic logical unit (ALU) occurred
during the last arithmetic operation. This bit is affected also during bit test and branch instructions and
during shifts and rotates.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
36
Freescale Semiconductor
Stack Pointer
3.6 Stack Pointer
The stack pointer (SP) contains the address of the next free location on the stack. During an MCU reset
or the reset stack pointer (RSP) instruction, the stack pointer is set to location $00FF. The stack pointer
is then decremented as data is pushed onto the stack and incremented as data is pulled from the stack.
When accessing memory, the 10 most significant bits are permanently set to 0000000011. These eight 0
bits are appended to the six least significant register bits to produce an address within the range of $00FF
to $00C0. Subroutines and interrupts may use up to 64 (decimal) locations. If 64 locations are exceeded,
the stack pointer wraps around and looses the previously stored information. A subroutine call occupies
two locations on the stack; an interrupt uses five locations.
15
7
0
0
0
0
0
0
0
0
0
1
1
SP
3.7 Program Counter
The program counter (PC) is a 16-bit register that contains the address of the next byte to be fetched.
15
0
PC
3.8 Arithmetic/Logic Unit
The arithmetic/logic unit (ALU) performs the arithmetic and logical operations defined by the instruction
set.
The binary arithmetic circuits decode instructions and set up the ALU for the selected operation. Most
binary arithmetic is based on the addition algorithm, carrying out subtraction as negative addition.
Multiplication is not performed as a discrete operation but as a chain of addition and shift operations within
the ALU. The multiply instruction (MUL) requires 11 internal processor cycles to complete this chain of
operations.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
37
Central Processor Unit (CPU)
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
38
Freescale Semiconductor
Chapter 4
Resets and Interrupts
4.1 Introduction
In user operating modes, the reset/interrupt vectors are located at the top of the address space
($FFF0–$FFFF). In self-check mode, the reset/interrupt vectors are located at $FFE0–$FFEF in the
internal self-check ROM. Descriptions in this section assume a user operating mode is in use. Table 4-1
shows the address assignments for the vectors.
Table 4-1. Interrupt Vector Assignments
Vector
Address
Interrupt Source
FFF0–FFF1
Timebase
FFF2–FFF3
SSPI
FFF4–FFF5
Timer 2
TI2I
OC2I
FFF6–FFF7
Timer 1
ICI
OC1I
TOI
FFF8–FFF9
KWI
FFFA–FFFB
IRQ
FFFC–FFFD
SWI
FFFE–FFFF
Reset
IRQ1
IRQ2
COP
RESET Pin
Power-On
Masked
by
Local
Mask
Priority
(1 = Highest)
I Bit
TBIE
7
I Bit
SPIE
6
I Bit
I Bit
TI2IE
OC2IE
5
5
I Bit
I Bit
I Bit
ICIE
OC1IE
TOIE
4
4
4
I Bit
KWIE
3
I Bit
I Bit
IRQ1E
IRQ2E
2
2
None
None
Same Level as
an Instruction
None
None
None
COPE
None
None
1
1
1
Upon reset, the I bit in the condition code register is set and interrupts are disabled (masked). When an
interrupt occurs, the I bit is set automatically by hardware after stacking the condition code register (CCR).
All interrupts in the MC68HC05L16 follow a fixed hardware priority circuit to resolve simultaneous
requests.
Each interrupt has a software programmable interrupt mask bit which may be used to selectively inhibit
automatic hardware response. In addition, the I bit in the CCR acts as a class inhibit mask to inhibit all
sources in the I-bit class. RESET and software interrupt (SWI) are not masked by the I bit in the CCR.
SWI is an instruction rather than a prioritized asynchronous interrupt source. In a sense, it is lower in
priority than any source because once any interrupt sequence has begun, SWI cannot override it. In
another sense, it is higher in priority than any hardware sources, except reset, because once the SWI
opcode is fetched, no other sources can be honored until after the first instruction in the SWI service
routine has been executed. SWI causes the I mask bit in the CCR to be set.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
39
Resets and Interrupts
4.2 Interrupts
There are six hardware interrupt sources in the MC68HC05L16:
• IRQ1 and IRQ2
• Key wakeup interrupt (KWI)
• Timer 1 (TOI, ICI, and OC1I)
• Timer 2 (TI2I and OC2I)
• Serial transfer complete interrupt (SSPI)
• Timebase interrupt (TBI)
4.2.1 IRQ1 and IRQ2
Two external interrupt request inputs, IRQ1 and IRQ2, share the same vector address at $FFFA and
$FFFB.
Bits IRQ1S and IRQ2S in interrupt control register (INTCR) control whether IRQ1 and IRQ2, respectively,
respond only to the falling edge or falling edge and low level to trigger an interrupt. The IRQ1 and IRQ2
are enabled by IRQ1E and IRQ2E bits and IRQ1F and IRQ2F bits are provided as an indicator in the
interrupt status register (INTSR). Since the IRQ1(2)F can be set by either the pins or the data latches of
PC7(6), be sure to clear the flags by software before setting the IRQ1(2)E bit.
The IRQ1 and the IRQ2 pins are shared with port C bit 7 and bit 6, respectively, and IRQx pin states can
be determined by reading port C pins. The BIL and BIH instructions apply only to the IRQ1 input.
4.2.2 Key Wakeup Interrupt (KWI)
Eight key wakeup inputs (KWI0–KWI7) share pins with port B. Each key wakeup input is enabled by the
corresponding bit in the KWIEN register which resides in the option map, and KWI is enabled by the KWIE
bit in the INTCR. When a falling edge is detected at one of the enabled key wakeup inputs, the KWIF bit
in the INTSR is set and KWI is generated if KWIE = 1. Each input has a latch which responds only to the
falling edge at the pin, and all input latches are cleared at the same time by clearing the KWIF bit. See
Figure 4-6.
4.2.3 IRQ (KWI) Software Consideration
IRQ and KWI interrupts have a timing delay in a case described in Figure 4-2. This section shows
programming for proper interrupts with IRQ or KWI.
Figure 4-1 shows an example of timer1 interrupt. In this case, the interrupt by TOF occurs as soon as the
TOIE (timer1 overflow interrupt enable) bit is set.
.
.
CLI
BSET TOIE, TCR
LDA #$55
.
.
.
TOF Interrupt pending
Interrupt occurs before this instruction
Figure 4-1. Timer 1 Interrupt
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
40
Freescale Semiconductor
Interrupts
Figure 4-2 shows an example of IRQ1 interrupt. In this case, the interrupt occurs after execution the
instruction following the instruction which sets IRQ1E bit. The similar action occurs against IRQ2 and KWI
interrupts.
.
.
CLI
BSET IRQ1E, INTCR
LDA #$55
.
.
.
IRQ1 interrupt pending
Interrupt occurs after this instruction
Figure 4-2. IRQ Timing Delay
This problem can be solved by using a software patch like Figure 4-3. A similar procedure could be used
for IRQ2 or KWI.
.
.
CLI
BSET IRQ1E, INTCR
NOP
LDA #$55
.
.
IRQ1 interrupt pending
Interrupt occurs after this instruction
Figure 4-3. Software Patch for IRQ1
4.2.4 Timer 1 Interrupt
Three timer 1 interrupts (TOI, ICI, and OC1I) share the same interrupt vector at $FFF6 and $FFF7. See
9.2 Timer 1.
4.2.5 Timer 2 Interrupt
Two timer 2 interrupts (TI2I and OC2I) share the same interrupt vector at $FFF4 and $FFF5. See 9.3.1
Timer Control Register 2.
4.2.6 SSPI Interrupt
The SSPI transfer complete interrupt uses the vector at $FFF2 and $FFF3. See Chapter 8 Simple Serial
Peripheral Interface (SSPI).
4.2.7 Timebase Interrupt
The timebase interrupt uses the vector at $FFF0 and $FFF1. See 7.5 Timebase.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
41
Resets and Interrupts
FROM RESET
Y
I BIT
IN CCR
SET ?
N
IRQ
EXTERNAL
INTERRUPT
Y
CLEAR IRQ
REQUEST
LATCH
N
INTERNAL
Y
INTERRUPT(1)
N
STACK
PC, X, A, CCR
FETCH NEXT
INSTRUCTION
SWI
INSTRUCTION
?
SET I BIT IN
CC REGISTER
Y
N
Y
RTI
INSTRUCTION
?
LOAD PC FROM
SWI:
$FFFC–$FFFD
IRQx:
$FFFA–$FFFB
KWI:
$FFF8–$FFF9
TIMER 1:
$FFF6–$FFF7
TIMER 2:
$FFF4–$FFF5
SSPI:
$FFF2–$FFF3
TBI:
$FFF0–$FFF1
N
RESTORE REGISTERS
FROM STACK:
CCR, A, X, PC
EXECUTE
INSTRUCTION
1. KWI, timer 1, timer 2, SSPI, and TBI
Figure 4-4. Interrupt Flowchart
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
42
Freescale Semiconductor
Interrupts
FOR BIH/BIL
0
READ
INSTRUCTION
SEL
H
D
Q
1
IRQ1
(PC7)
C
S
R
IRQ1S
DATA
BUS
Q
IRQ1F
R
RESET/POR
RITE 1 TO RIRQ1
IRQ1E
INT
IRQ2E
WRITE 1 TO
RESET/POR
IRQ2S
S
C
H
D
DATA
BUS
Q
R
IRQ2
(PC6)
R
IRQ2F
1
Q
SEL
READ
INSTRUCTION
0
Figure 4-5. IRQ1 and IRQ2 Block Diagram
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
43
Resets and Interrupts
KWIE0
D
H
KWI0
(PB0)
Q
C
R
KWIE1
H
KWI1
(PB1)
D
Q
C
R
READ KWIF
KWI2 TO KWI6
S
KWIE7
Q
KWIF
DATA
BUS
R
H
KWI7
(PB7)
D
Q
C
R
RESET/POR
WRITE 1 TO RKWIF
KWI
KWIE
Figure 4-6. Key Wakeup Interrupt (KWI)
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
44
Freescale Semiconductor
Interrupt Control Register
4.3 Interrupt Control Register
Address:
Read:
Write:
Reset:
$0008
Bit 7
6
5
4
3
2
1
Bit 0
IRQ1E
IRQ2E
0
KWIE
IRQ1S
IRQ2S
0
0
0
0
0
0
0
0
0
0
Figure 4-7. Interrupt Control Register (INTCR)
IRQ1E — IRQ1 Interrupt Enable
The IRQ1E bit enables IRQ1 interrupt when IRQ1F is set. This bit is cleared on reset.
0 = IRQ1 interrupt disabled
1 = IRQ1 interrupt enabled
IRQ2E — IRQ2 Interrupt Enable
The IRQ2E bit enables IRQ2 interrupt when IRQ2F is set. This bit is cleared on reset.
0 = IRQ2 interrupt disabled
1 = IRQ2 interrupt enabled
Bit 5 — Reserved
This bit is not used and is always read as logic 0.
KWIE — Key Wakeup Interrupt (KWI) Enable
The KWIE bit enables key wakeup interrupt when KWIF is set. This bit is cleared on reset.
0 = KWI disabled
1 = KWI enabled
IRQ1S — IRQ1 Select Edge Sensitive Only
0 = IRQ1 configured for low level and negative edge sensitive
1 = IRQ1 configured to respond only to negative edges
IRQ2S — IRQ2 Select Edge Sensitive Only
0 = IRQ2 configured for low level and negative edge sensitive
1 = IRQ2 configured to respond only to negative edges
Bits 1 and 0 — Reserved
These bits are not used and always read as logic 0.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
45
Resets and Interrupts
4.4 Interrupt Status Register
Address:
Read:
$0009
Bit 7
6
5
4
IRQ1F
IRQ2F
0
KWIF
Write:
Reset:
0
0
0
0
3
2
0
0
RIRQ1
RIRQ2
0
0
1
0
0
Bit 0
0
RKWIF
0
= Unimplemented
Figure 4-8. Interrupt Status Register (INTSR)
IRQ1F — IRQ1 Interrupt Flag
When IRQ1S = 0, the falling edge or low level at the IRQ1 pin sets IRQ1F. When IRQ1S = 1, only the
falling edge sets the IRQ1F bit. If the IRQ1E bit and this bit are set, an interrupt is generated. This
read-only bit is cleared by writing a logic 1 to the RIRQ1 bit. Reset clears this bit.
IRQ2F — IRQ2 Interrupt Flag
When IRQ2S = 0, the falling edge or low level at the IRQ2 pin sets IRQ2F. When IRQ2S = 1, only the
falling edge sets the IRQ2F bit. If the IRQ2E bit and this bit are set, an interrupt is generated. This
read-only bit is cleared by writing a logic 1 to the RIRQ2 bit. Reset clears this bit.
Bit 5 — Reserved
This bit is not used and is always read as logic 0.
KWIF — Key Wakeup Interrupt Flag
When the KWIEx bit in the KWIEN register is set, the falling edge at the KWIx pin sets the KWIF bit. If
the KWIE bit and this bit are set, an interrupt is generated. This read-only bit is cleared by writing a
logic 1 to the RKWIF bit. Reset clears this bit.
RIRQ1 — Reset IRQ1 Flag
The RIRQ1 bit is a write-only bit and is always read as logic 0. Writing a logic 1 to this bit clears the
IRQ1F bit and writing logic 0 to this bit has no effect.
RIRQ2 — Reset IRQ2 Flag
The RIRQ2 bit is a write-only bit and is always read as logic 0. Writing a logic 1 to this bit clears the
IRQ2F bit and writing a logic 0 to this bit has no effect.
Bit 1 — Reserved
This bit is not used and is always read as logic 0.
RKWIF — Reset KWI Flag
The RKWIF bit is a write-only bit and is always read as logic 0. Writing a logic 1 to this bit clears the
KWIF bit and writing a logic 0 to this bit has no effect.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
46
Freescale Semiconductor
Chapter 5
Low-Power Modes
5.1 Introduction
The MCU has two power-saving modes, stop and wait. Flowcharts of these modes are shown in
Figure 5-2.
5.2 Stop Mode
The STOP instruction places the MCU in its lowest-power mode. In stop mode, the internal main oscillator
OSC is turned off, halting all internal processing, including timer operations (timer 1, timer 2, and
computer operating properly (COP) watchdog timer). Suboscillator XOSC does not stop oscillating.
Therefore, if XOSC is used as the clock source for the COP watchdog timer, COP is still functional in stop
mode. See Chapter 7 Oscillators/Clock Distributions.
During stop mode, the timer prescaler is cleared. The I bit in the condition code register (CCR) is cleared
to enable external interrupts. All other registers and memory remain unaltered. All input/output lines
remain unchanged. The processor can be brought out of stop mode only by RESET or an interrupt from
IRQ1, IRQ2, KWI, SSPI (slave mode only), or TBI. See Chapter 7 Oscillators/Clock Distributions.
5.3 Wait Mode
The WAIT instruction places the MCU in a low-power mode, but wait mode consumes more power than
stop mode. All CPU action is suspended, but on-chip peripherals and oscillators remain active. Any
interrupt or reset (including a COP reset) will cause the MCU to exit wait mode.
During wait mode, the I bit in the CCR is cleared to enable interrupts. All other registers, memory, and
input/output lines remain in their previous state. The timers may be enabled to allow a periodic exit from
wait mode. Wait mode must be exited and the COP must be reset to prevent a COP timeout.
The reduction of power in wait mode depends on how many of the on-chip peripheral's clocks can be shut
down. Therefore, the amount of power that will be consumed is dependent on the application, and it would
be prohibitive to test all parts for all variations. For these reasons, the values given in Chapter 12 Electrical
Specifications reflect typical application conditions after initial characterization of silicon.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
47
Low-Power Modes
STATE A
CPU:
RUN
PH2:
X1/2
X1:
ON
X2:
ON
STATE B
RESET
INT
STATE C
CPU:
RUN
CPU:
RUN
PH2:
X1/4
PH2:
X1/64
X1:
ON
X1:
ON
X2:
ON
X2:
ON
STATE A
STATE B
STATE C
STOP
STATE D
CPU:
RUN
PH2:
X2/2
X1:
ON
X2:
ON
X1EN = 0
RESET
DELAY
STOP
INT
X1EN = 1
RESET
STATE E
CPU:
RUN
PH2:
X2/2
X1:
OFF
X2:
ON
INT
STOP
POWER-ON
STATE D
STATE E
INT
Notes:
PH2 is at same frequency as internal processor clock E.
X1 = OSC
X2 = XOSC
X1EN = FOSCE
Low Power
High Speed
STOP ↔ E ↔ D ↔ C ↔ B ↔ A
Figure 5-1. Clock State and STOP Recovery/Power-On Reset Delay Diagrams
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
48
Freescale Semiconductor
Wait Mode
STOP
WAIT
STOP OSCILLATOR
OSC
AND ALL CLOCKS
EXCEPT XOSC
CLEAR I BIT
OSCILLATOR ACTIVE
TIMER CLOCK ACTIVE
PROCESSOR CLOCKS
STOPPED
CLEAR I BIT
RESET?
RESET?
N
N
EXTERNAL
INTERRUPT
IRQ?
N
KWI
INTERRUPT
?
Y
Y
Y
Y
Y
Y
Y
INTERRUPT
?
†
Y
Y
N
TIMER 1
INTERRUPT
?
N
N
TIMEBASE
KWI
INTERRUPT
?
N
N
SSPI
EXTERNAL
INTERRUPT
IRQ?
N
TIMER 2
INTERRUPT
?
N
Y
INTERRUPT‡
?
IF FOSC = 1
TURN ON OSCILLATOR
OSC
WAIT FOR TIME
Y
SSPI
INTERRUPT
?
N
Y
TIMEBASE
INTERRUPT
?
RESTART
PROCESSOR CLOCK
N
1. FETCH RESET
VECTOR OR
2. SERVICE
INTERRUPT
A. STACK
B. SET I BIT
C. VECTOR TO
INTERRUPT
ROUTINE
1. FETCH RESET
VECTOR OR
2. SERVICE
INTERRUPT
A. STACK
B. SET I BIT
C. VECTOR TO
INTERRUPT
ROUTINE
Notes:
†
Slave Mode Only
‡
When TBCLK = 0
Figure 5-2. Stop/Wait Flowcharts
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
49
Low-Power Modes
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
50
Freescale Semiconductor
Chapter 6
Parallel Input/Output (I/O)
6.1 Introduction
The MCU has five parallel ports:
• Port A has eight I/O pins.
• Port B has eight input/only pins.
• Port C has eight I/O pins.
• Port D has seven output-only pins.
• Port E has eight output-only pins.
Most of these 39 I/O pins serve multiple purposes depending on the configuration of the MCU system.
The configuration is in turn controlled by hardware mode selection as well as internal control registers.
DATA DIRECTION
INTERNAL HC05 CONNECTIONS
REGISTER BIT
LATCHED OUTPUT
OUTPUT
DATA BIT
I/O
PIN
INPUT
REG
BIT
INPUT
I/O
Figure 6-1. Port I/O Circuitry for One Bit
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
51
Parallel Input/Output (I/O)
6.2 Port A
Port A is an 8-bit, bidirectional, general-purpose port. The data direction of a port A pin is determined by
its corresponding DDRA bit.
When a port A pin is programmed as an output by the corresponding DDRA bit, data in the PORTA data
register becomes output data to the pin. This data is returned when the PORTA register is read.
Open drain or CMOS outputs are selected by AWOMH and AWOML bits in the WOM1 register. If the
AWOMH bit is set, the P-channel drivers of bits 7–4 output buffers are disabled (open drain). If the
AWOML bit is set, the P-channel drivers of bits 3–0 output buffers are disabled (open drain).
When a bit is programmed as input by the corresponding DDRA bit, the pin level is read by the CPU.
Port A has optional pullup resistors. When the RAH bit or RAL bit in the RCR1 is set, pullup resistors are
attached to the upper four bits or lower four bits of port A pins, respectively. When a pin outputs a low
level, the pullup resistor is disconnected regardless of the RAH or RAL bit state.
6.2.1 Port A Data Register
Address:
Read:
Write:
$0000
Bit 7
6
5
4
3
2
1
Bit 0
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
Reset:
Unaffected by reset
Figure 6-2. Port A Data Register (PORTA)
Read
Anytime; returns pin level if DDR set to input; returns output data latch if DDR set to output
Write
Anytime; data stored in an internal latch; drives pin only if DDR set for output
Reset
Becomes high-impedance input
6.2.2 Port A Data Direction Register
Address:
Read:
Write:
Reset:
Option Map — $0000
Bit 7
6
5
4
3
2
1
Bit 0
DDRA7
DDRA6
DDRA5
DDRA4
DDRA3
DDRA2
DDRA1
DDRA0
0
0
0
0
0
0
0
0
Figure 6-3. Port A Data Direction Register (DDRA)
Read
Anytime when OPTM = 1
Write
Anytime when OPTM = 1
Reset
Cleared to $00; all general-purpose I/O configured for input
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
52
Freescale Semiconductor
Port B
DDRAx — Port A Data Direction Register Bit x
0 = Configure I/O pin PAx to input
1 = Configure I/O pin PAx to output
6.3 Port B
Port B pins serve two basic functions: KWI input pins and general-purpose input pins.
Each KWI input is enabled or disabled by the corresponding KWIEx bit in the KWIEN register, and the
usage of the KWI input does not affect the general-purpose input function.
Port B pin states may be read any time regardless of the configurations. Since there is no output drive
logic associated with port B, there is no DDRB register and the write to the PORTB register has no
meaning.
Port B has optional pullup resistors. When the RBH or RBL bit in the RCR1 is set, pullup resistors are
attached to the upper four bits or lower four bits of port A pins, respectively.
Address:
Read:
Write:
$0001
Bit 7
6
5
4
3
2
1
Bit 0
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
Reset:
Unaffected by reset
Figure 6-4. Port B Data Register (PORTB)
Read
Anytime; returns pin level
Write
Has no meaning or effect
Reset
Unaffected; always an input port
6.4 Port C
Port C pins share functions with several on-chip peripherals. A pin function is controlled by the enable bit
of each associated peripheral.
Bit 7 and bit 6 of port C are general-purpose I/O pins and IRQ input pins. The DDRC7 and DDRC6 bits
determine whether the pin states or the data latch states should be read by the CPU. Since IRQ1F or
IRQ2F can be set by either the pins or the data latches, when using IRQs, be sure to clear the flags by
software before enabling the IRQ1E or IRQ2E bits.
When configured for output port, PC6 and PC7 are open drain only. When VDD output is required, a pullup
resistor must be enabled.
The PC5 pin is a general-purpose I/O pin and the direction of the pin is determined by the DDRC5 bit in
the data direction register C (DDRC). When the event output (EVO) is enabled, the PC5 is configured as
an event output pin and the DDRC5 bit has meaning only for the read of PC5 bit in the PORTC register;
if the DDRC5 is set, the PC5 data latch is read by the CPU. Otherwise, PC5 pin level (EVO state) is read.
When EVO is disabled, the DDRC5 bit decides the idling state of EVO (if DDRC5 = 1).
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
53
Parallel Input/Output (I/O)
The PC4 and PC3 pins share functions with the timer input pins (EVI and TCAP). These bits are not
affected by the usage of timer input functions and the directions of pins are always controlled by the
DDRC4 and DDRC3 bits. Also, the DDRC4 and DDRC3 bits determine whether the pin states or data
latch states should be read by the CPU.
NOTE
Since the TCAP pin is shared with the PC3 I/O pin, changing the state of
the PC3 DDR or data register can cause an unwanted TCAP interrupt. This
can be handled by clearing the ICIE bit before changing the configuration
of PC3 and clearing any pending interrupts before enabling ICIE.
Since the EVI pin is shared with the PC4 I/O pin, DDRC4 should always be
cleared whenever EVI is used. EVI should not be used when DDRC4 is
high.
The PC2–PC0 pins are shared with the simple serial peripheral interface (SSPI). When the SSPI is not
used (SPE = 0), DDRC2–DDRC0 bits control the direction of the pins, and when the SSPI is enabled, the
pins are configured as serial clock output or input (SCK), serial data output (SDO), and serial data input
(SDI). The direction of the SCK depends on the MSTR bit in the SPCR. When PORTC is read, the value
read will be determined by the data direction register. When the port is configured for input (DDRC2,
DDRC1, or DDRC0 equal to logic 0) the pin state is read. When the port is configured for output (DDRC2,
DDRC1, or DDRC0 equal to logic 0), the output data latch is read.
Port C has optional pullup resistors. When the RCx bit in the RCR2 is set, pullup resistors are attached
to the PCx pin. When a pin outputs a low level, the pullup resistor is disconnected regardless of an RCR2
register bit being set
Bits 5–0 have open drain or CMOS output options, which are controlled by the corresponding WOM2
register bits. These open drain or CMOS output options may be selected for either the general-purpose
output ports or the peripheral outputs (EVO, SCK, and SDO).
6.4.1 Port C Data Register
Address:
Read:
Write:
$0002
Bit 7
6
5
4
3
2
1
Bit 0
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
Reset:
Unaffected by reset
Figure 6-5. Port C Data Register (PORTC)
Read
Anytime; returns pin level if DDR set to input; returns output data latch if DDR set to output
Write
Anytime; data stored in an internal latch; drives pin only if DDR set for output writes do not change pin
state when pin configured for SDO, SCK, and EVO peripheral output
Reset
Becomes high-impedance input
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
54
Freescale Semiconductor
Port D
6.4.2 Port C Data Direction Register
Address:
Read:
Write:
Reset:
Option Map — $0002
Bit 7
6
5
4
3
2
1
Bit 0
DDRC7
DDRC6
DDRC5
DDRC4
DDRC3
DDRC2
DDRC1
DDRC0
0
0
0
0
0
0
0
0
Figure 6-6. Port C Data Direction Register (DDRC)
Read
Anytime when OPTM = 1
Write
Anytime when OPTM = 1
Reset
Cleared to $00; all general-purpose I/O configured for input
DDRCx — Port C Data Direction Register Bit x
The timer and SSPI force the I/O state to be an output for each port C line associated with an enabled
output function such as SDO and EVO. For these cases, the data direction bits will not change.
0 = Configure I/O pin PCx to input
1 = Configure I/O pin PCx to output
6.5 Port D
Port D pins serve one of two basic functions depending on the MCU mode selected:
• LCD frontplane and backplane driver outputs
• General-purpose output pins
Since port D is an output-only port, there is no DDRD register. Instead of DDRD, port D MUX control
register (PDMUX) is used. Bits 7–4 of this register control the port/LCD muxing of port D bits 7–4,
respectively, on a bit-wide basis. These bits are cleared on reset, and writing a logic 1 to any bit will turn
that pin into a port output. This function is superseded by the PDH bit in the LCD control register. When
PDH is set, the upper four bits of port D become port outputs regardless of the state of the PDMUX bits.
On reset, all port D outputs are disconnected from the pins and the port D data latches are set to a logic 1.
The pin connections of the lower three bits of port D depend on the LCD duty selection by the DUTY1 and
DUTY0 bits in the LCDCR. When the LCD duty is not 1/4, the unused backplane driver(s) is (are) replaced
by the port D output pin(s) automatically.
If DWOMH bit or DWOML bit in the WOM1 register is set, the P-channel drivers of output buffers at the
upper four bits or lower three bits, respectively, are disabled (open-drain mode). These open-drain
controls do not apply to the pins which are configured as frontplane or backplane driver outputs.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
55
Parallel Input/Output (I/O)
6.5.1 Port D Data Register
Address:
Read:
Write:
Reset:
$0003
Bit 7
6
5
4
3
2
1
Bit 0
PD7
PD6
PD5
PD4
PD3
PD2
PD1
1
1
1
1
1
1
1
1
1
Figure 6-7. Port D Data Register (PORTD)
Read
Anytime; returns output data latch; bit 0 is always read logic 1
Write
Anytime (Writes do not change pin state when configured for LCD driver output.)
Reset
All bits set to logic 1 and output ports disconnected from the pins (LCD is enabled on reset.)
6.5.2 Port D MUX Register
Address:
Read:
Write:
Reset:
Option Map — $0003
Bit 7
6
5
4
3
2
1
Bit 0
PDM7
PDM6
PDM5
PDM4
0
0
0
0
0
0
0
0
0
0
0
0
Figure 6-8. Port D MUX Register (PDMUX)
Read
Anytime (When OPTM = 1, bits 3–0 always read logic 0.)
Write
Anytime (Writes have no effect if PDH is set.)
Reset
All bits cleared; LCD enabled
PDMx — Port D MUX Control bit x
0 = Configure pin PDx to LCD
1 = Configure pin PDx to output
6.6 Port E
Port E pins serve one of two basic functions depending on the MCU mode selected:
• LCD frontplane driver outputs
• General-purpose output pins
Since port E is an output-only port, there is no DDRE register. Instead of DDRE, port E MUX control
register (PEMUX) is used. Bits 7–0 of this register control the port/LCD muxing of port E bits 7–0
respectively on a bit-wide basis. These bits are cleared on reset, and writing a logic 1 to any bit will turn
that pin into a port output. This function is superseded by the PEH and PEL bits in the LCD control register.
When PEH is set, the upper four bits of port E become port outputs regardless of the state of the PEMUX
bits. Likewise, when PEL is set, the lower four bits of port E become outputs.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
56
Freescale Semiconductor
Port E
On reset, all port E outputs are disconnected from the pins and the port E data latches are set to logic 1.
If EWOMH bit or EWOML bit in the WOM1 register is set, the P-channel driver of output buffers at the
upper or lower four bits, respectively, are disabled (open-drain mode). These open-drain controls do not
apply to the pins which are configured as frontplane driver outputs.
6.6.1 Port E Data Register
Address:
Read:
Write:
Reset:
$0004
Bit 7
6
5
4
3
2
1
Bit 0
PE7
PE6
PE5
PE4
PE3
PE2
PE1
PE0
1
1
1
1
1
1
1
1
Figure 6-9. Port E Data Register (PORTE)
Read
Anytime; returns output data latch
Write
Anytime (Writes do not change pin state when configured for LCD driver output.)
Reset
All bits set to logic 1 and output ports disconnected from the pins (LCD is enabled on reset.)
6.6.2 Port E MUX Register
Address:
Read:
Write:
Reset:
Option Map — $0004
Bit 7
6
5
4
3
2
1
Bit 0
PEM7
PEM6
PEM5
PEM4
PEM3
PEM2
PEM1
PEM0
0
0
0
0
0
0
0
0
Figure 6-10. Port E MUX Register (PEMUX)
Read
Anytime when OPTM = 1
Write
Anytime (Writes have no effect if PEH/PEL is set.)
Reset
All bits cleared (LCD is enabled.)
PEMx — Port E MUX Control Bit x
0 = Configure pin PEx to LCD
1 = Configure pin PEx to output
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
57
Parallel Input/Output (I/O)
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
58
Freescale Semiconductor
Chapter 7
Oscillators/Clock Distributions
7.1 Introduction
There are two oscillator blocks: OSC and XOSC. Several combinations of the clock distributions are
allowed for the modules in the MC68HC05L16. Refer to Figure 7-1.
FOSCE/
PWRON
WAIT
OSC
OSC2
OSC DIVIDER
7-BIT
1/20
1/21
1/25
SEL
1/2
SYSTEM
CLOCK
SYS1
CPU
SSPI
SYS0
TIMER 1
CLK
CTRL
1/27
POR
6-BIT
STOP
FTUP
TIMER 2
EXCLK
LCD DRIVER AND PORTS
OSC1
1/27
XOSC1
XCLK
TIMEBASE
XOSC
XOSC2
Figure 7-1. Clock Signal Distribution
7.2 OSC Clock Divider and POR Counter
The OSC clock is divided by a 7-bit counter which is used for the system clock, timebase, and power-on
reset (POR) counter. Clocks divided by 2, 4, and 64 are available for the system clock selections and a
clock divided by 128 is provided for the timebase and POR counter.
The POR counter is a 6-bit clock counter that is driven by the OSC divided by 128. The overflow of this
counter is used for setting FTUP bit, releasing the POR, and resuming operation from stop mode.
The 7-bit divider and POR counter are initialized to $0078 by two conditions:
• Power-on detection
• When FOSCE bit is cleared
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
59
Oscillators/Clock Distributions
7.3 System Clock Control
The system clock is provided for all internal modules except timebase. Both OSC and XOSC are available
as the system clock source. The divide ratio is selected by the SYS1 and SYS0 bits in the MISC register.
(See Table 7-1.)
By default, OSC/64 is selected on reset.
Table 7-1. System Bus Clock Frequency Selection
SYS1 SYS0
Divide Ratio
CPU Bus Frequency (Hz)
OSC = 4.0 M
OSC = 4.1943 M
XOSC = 32.768 k
0
0
OSC ÷ 2
2.0 M
2.0972 M
—
0
1
OSC ÷ 4
1.0 M
1.0486 M
—
1
0
OSC ÷ 64
62.5 k
65.536 k
—
1
1
XOSC ÷ 2
—
—
16.384 k
NOTE
Do not switch the system clock to XOSC (SYS1 and SYS0 = 11) when
XOSC clock is not available. The XOSC clock is available when STUP flag
is set.
Do not switch the system clock to OSC (SYS1 and SYS0 = 00, 01, or 10)
when OSC clock is not available. The OSC clock is available when FTUP
flag is set.
7.4 OSC and XOSC
The secondary oscillator (XOSC) runs continuously after power up. The main oscillator (OSC) can be
stopped to conserve power via the STOP instruction or the FOSCE bit in the MISC register. The effects
of restarting the OSC will vary depending on the current state of the MCU, including SYS0, SYS1, and
FOSCE.
7.4.1 OSC on Line
If the system clock is OSC, FOSCE should remain logic 1. Executing the STOP instruction in this condition
will halt OSC, put the MCU into a low-power mode, and clear the 6-bit POR counter. The 7-bit divider is
not initialized. Exiting STOP with external IRQ or reset re-starts the oscillator. When the POR counter
overflows, internal reset is released and execution can begin. The stabilization time will vary between
8064 and 8192 counts.
NOTE
Exiting STOP with external reset will always return the MCU to the state as
defined by the default register definitions, for example,
SYS0:SYS1 = 1:0, FOSCE = 1.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
60
Freescale Semiconductor
OSC and XOSC
XOSC
OSC
OSC1
XOSC1
OSC2
Rf
XOSC2
Rf
MASK
OPTION
MASK
OPTION
Rd
ON CHIP
OFF CHIP
Figure 7-2. OSC1, OSC2, XOSC1, and XOSC2 Mask Options
7.4.2 XOSC on Line
If XOSC is the system clock (SYS:SYS1 = 1:1), OSC can be stopped either by the STOP instruction or
by clearing the FOSCE bit.
The suboscillator (XOSC) never stops except during power down. This clock also may be used as the
clock source of the system clock and timebase. STUP bit indicates that the XOSC clock is available.
OSC and XOSC pins have options for feedback and damping resistor implementations. These options
are set through mask option and may be read through the MOSR register.
NOTE
When XOSC is not used, the XOSC1 input pin should be connected to the
RESET pin.
RESET LOGIC
XOSC
RESET
XOSC1
XOSC2
ON CHIP
OFF CHIP
NO CONNECT
FROM EXTERNAL RESET CIRCUIT
Figure 7-3. Unused XOSC1 Pin
7.4.2.1 XOSC with FOSCE = 1
If the system clock is XOSC and FOSCE = 1, executing the STOP instruction will halt OSC, put the MCU
into a low-power mode and clear the 6-bit POR counter. The 7-bit divider is not initialized. Exiting STOP
with external IRQ re-starts the oscillator; however, execution begins immediately using XOSC. When the
POR counter overflows, FTUP is set, signaling that OSC is stable and OSC can be used as the system
clock. The stabilization time will vary between 8064 and 8192 counts.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
61
Oscillators/Clock Distributions
7.4.2.2 XOSC with FOSCE = 0
If XOSC is the system clock, clearing FOSCE will stop OSC and preset the 7-bit divider and 6-bit POR
counter to $0078. Execution will continue with XOSC and when FOSCE is set again, OSC will re-start.
When the POR counter overflows, FTUP is set, signaling that OSC is stable and OSC can be used as the
system clock. The stabilization time will be 8072 counts.
7.4.2.3 XOSC with FOSCE = 0 and STOP
If XOSC is the system clock and FOSCE is cleared, further power reduction can be achieved by executing
the STOP instruction. In this case, OSC is stopped, the 7-bit divider and 6-bit POR counter are preset to
$0078 (since FOSCE = 0) and execution is halted. Exiting STOP with external IRQ does not re-start the
OSC; however, execution begins immediately using XOSC. OSC may be re-started by setting FOSCE.
When the POR counter overflows, FTUP will be set, signaling that OSC is stable and can be used as the
system clock. The stabilization time will be 8072 counts.
7.4.2.4 Stop Mode and Wait Mode
During stop mode, the main oscillator (OSC) is shut down and the clock path from the second oscillator
(XOSC) is disconnected. All modules except timebase are halted. Entering stop mode clears the FTUP
flag in the MISC register and initializes the POR counter. Stop mode is exited by RESET, IRQ1, IRQ2,
KWI, SSPI (slave mode), or timebase interrupt.
If OSC is selected as the system clock source during stop mode, CPU resumes after the overflow of the
POR counter and this overflow also sets the FTUP status flag.
If XOSC is selected as the system clock source during stop mode, no stop recovery time is required for
exiting stop mode because XOSC never stops. Re-start of the main oscillator depends on the FOSCE bit.
During wait mode, only the CPU clocks are halted and the peripheral modules are not affected. Wait mode
is exited by RESET and any interrupts.
Table 7-2. Recovery Time Requirements
Before Reset or Interrupt
External
Reset
Exit Stop
Mode by
Interrupt
CPU Clock Source
Stop
FOSCE
Power-On
Reset
—
—
—
Wait
—
—
OSC (OSC on)
Out
1
—
No wait
—
OSC (OSC off)
Out
In
In(1)
0(2)
1
0(1)
—
—
—
Wait
Wait
Wait
—
Wait
Wait
XOSC (OSC on)
Out
1
—
No wait
—
XOSC (OSC off)
Out
In
In
0
1
0
—
—
—
Wait
Wait
Wait
—
No wait
No wait
1. This case never occurs.
2. This case has no meaning for the applications.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
62
Freescale Semiconductor
Timebase
7.5 Timebase
Timebase is a 14-bit up-counter which is clocked by XOSC input or OSC input divided by 128. TBCLK bit
in the TBCR1 register selects the clock source.
This 14-bit divider is initialized to $0078 only upon power-on reset (POR). After counting 8072 clocks, the
STUP bit in the MISC register is set.
The divided clocks from the timebase are used for LCDCLK, STUP, TBI, and COP. (See Figure 7-4).
7.5.1 LCDCLK
The clocks divided by 64 and 128 are used as LCD clocks at the LCD driver module, and clocks are
selected by the LCLK bit in the TBCR1.
TBCLK
LCLK
1
OSC/27
1/26
SEL
XCLK
7-BIT
DIVIDER
0
0
LCD
CLOCK
SEL
1/27
TBR1
1
TBIE
7-BIT
DIVIDER
1/20
1/25
1/26
1/27
SEL
TBIF
TBI
TBR0
COP CLEAR
DIVIDE BY 4
COP
RESET
COP ENABLE
Figure 7-4. Timebase Clock Divider
7.5.2 STUP
Timebase divider is initialized to $0078 by the power-on detection. When the count reaches 8072, the
STUP flag in the MISC register is set. Once the STUP flag is set, it is never cleared until power down.
7.5.3 TBI
Timebase interrupts may be generated every 0.5, 0.25, 0.125, or 0.0039 seconds with a 32.768-kHz
crystal at XOSC pins.
The timebase interrupt flag (TBIF) is set every period and interrupt is requested if the enable bit (TBIE) is
set. The clock divided by 128, 4096, 8192, or 16,384 is used to set TBIF, and this clock is selected by the
TBR1 and TBR0 bits in the TBCR2 register. (See Table 7-3.)
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
63
Oscillators/Clock Distributions
Table 7-3. Timebase Interrupt Frequency
TBCR2
Frequency (Hz)
TBR
1
TBR
0
Divide Ratio
0
0
0
1
1
0
TBCLK ÷ 8192
3.81
4.00
4.00
1
1
TBCLK ÷ 16,384
1.91
2.00
2.00
OSC = 4.0 M
OSC = 4.1943 M
XOSC = 32.768 k
TBCLK ÷ 128
244
256
256
TBCLK ÷ 4096
7.63
8.00
8.00
7.5.4 COP
The computer operating properly (COP) watchdog timer is controlled by the COPE and COPC bits in the
TBCR2 register.
The COP uses the same clock as TBI that is selected by the TBR1 and TBR0 bits. The TBI is divided by
four and overflow of this divider generates COP timeout reset if the COP enable (COPE) bit is set. The
COP timeout reset has the same vector address as POR and external RESET. To prevent the COP
timeout, the COP divider is cleared by writing a logic1 to the COP clear (COPC) bit.
When the timebase divider is driven by the OSC clock, clock for the divider is suspended during stop
mode or when FOSCE is a logic 0. This may cause COP period stretching or no COP timeout reset when
processing errors occur. To avoid these problems, it is recommended that the XOSC clock be used for
the COP functions.
When the timebase (COP) divider is driven by the XOSC clock, the divider does not stop counting and
the COPC bit must be triggered to prevent the COP timeout.
Table 7-4. COP Timeout Period
TBCR2
COP Period (ms)
TBR1
TBR0
0
OSC = 4.0 MHz
OSC = 4.1943 MHz
XOSC = 32.768 kHz
Min
Max
Min
Max
Min
Max
0
12.3
16.4
11.7
15.6
11.7
15.6
0
1
393
524
375
500
375
500
1
0
786
1048
750
1000
750
1000
1
1
1573
2097
1500
2000
1500
2000
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
64
Freescale Semiconductor
Timebase
7.5.5 Timebase Control Register 1
Address:
Read:
Write:
Reset:
$0010
Bit 7
6
5
4
3
2
1
Bit 0
TBCLK
0
LCLK
0
0
0
T2R1
T2R0
0
0
0
0
0
0
0
0
Figure 7-5. Timebase Control Register 1 (TBCR1)
Read
Anytime
Write
Anytime (Only one write is allowed on bit 7 after reset.)
TBCLK — Timebase Clock
The TBCLK bit selects the timebase clock source. This bit is cleared on reset. After reset, write to this
bit is allowed only once.
0 = XOSC clock selected
1 = OSC clock divided by 128 selected
Bit 6 — Reserved
This bit is not used and always reads as logic 0.
LCLK — LCD Clock
The LCLK bit selects the clock for the LCD driver. This bit is cleared on reset.
0 = Divide by 64 selected
1 = Divide by 128 selected
Bits 4–2 — Reserved
These bits are not used and always read as logic 0.
T2R1 and T2R0 — Timer 2 Prescale Rate Select Bits
T2R1 and T2R0 select timer 2 clock rate. See 9.3 Timer 2 for more detail.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
65
Oscillators/Clock Distributions
7.5.6 Timebase Control Register 2
Address:
$0011
Bit 7
Read:
TBIF
Write:
Reset:
0
6
5
4
TBIE
TBR1
TBR0
0
1
1
3
2
0
0
RTBIF
0
1
Bit 0
0
0
COPE
COPC
0
0
0
= Unimplemented
Figure 7-6. Timebase Control Register 2 (TBCR2)
Read
Anytime (Bits 3 and 0 are write-only bits and always read as logic 0.)
Write
Anytime (Bit 7 is a read-only bit and write has no effect; bit 1 is 1-time write bit.)
TBIF — Timebase Interrupt Flag
The TBIF bit is set every timeout interval of the timebase counter. This read-only bit is cleared by
writing a logic 1 to the RTBIF bit. Reset clears the TBIF bit. The timebase interrupt period between
reset and the first TBIF depends on the time elapsed during reset, since the timebase divider is not
initialized on reset.
TBIE — Timebase Interrupt Enable
The TBIE bit enables the timebase interrupt capability. If TBIF = 1 and TBIE = 1, the timebase interrupt
is generated.
0 = Timebase interrupt disabled
1 = Timebase interrupt requested when TBIF = 1
TBR1 and TBR0 — Timebase Interrupt Rate Select
The TBR1 and TBR0 bits select one of four rates for the timebase interrupt period (see Table 7-3). The
TBS rate is also related to the COP timeout reset period. These bits are set to logic 1 on reset.
Table 7-5. Timebase Interrupt Frequency
TBCR2
Divide Ratio
Frequency (Hz)
TBR1
TBR0
OSC = 4.0 M
OSC = 4.1943 M
XOSC = 32.768 k
0
0
TBCLK ÷ 128
244
256
256
0
1
TBCLK ÷ 4096
7.63
8.00
8.00
1
0
TBCLK ÷ 8192
3.81
4.00
4.00
1
1
TBCLK ÷ 16,384
1.91
2.00
2.00
RTBIF — Reset TBS Interrupt Flag
The RTBIF bit is a write-only bit and is always read as logic 0. Writing logic 1 to this bit clears the TBIF
bit and writing logic 0 to this bit has no effect.
Bit 2 — Reserved
This bit is not used and is always read as logic 0.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
66
Freescale Semiconductor
Timebase
COPE — COP Enable
When the COPE bit is logic 1, the COP reset function is enabled. This bit is cleared on reset (including
COP timeout reset) and write to this bit is allowed only once after reset.
COPC — COP Clear
Writing logic 1 to the COPC bit clears the 2-bit divider to prevent COP timeout. (The COP timeout
period depends on the TBI rate.) This bit is a write-only bit and returns to logic 0 when read.
7.5.7 Miscellaneous Register
Address:
$003E
Bit 7
6
5
4
Read:
FTUP
STUP
0
0
*
*
0
0
Write:
Reset:
= Unimplemented
3
2
1
Bit 0
SYS1
SYS0
FOSCE
OPTM
1
0
1
0
* Unaffected by reset but initialized by power-on reset
Figure 7-7. Miscellaneous Register (MISC)
FTUP — OSC Time Up Flag
Power-on detection and clearing the FOSCE bit clears this read-only bit. This bit is set by the overflow
of the POR counter. Reset does not affect this bit.
0 = During POR or OSC shut down
1 = OSC clock available for the system clock
STUP — XOSC Time Up Flag
Power-on detection clears this read-only bit. This bit is set after the timebase has counted 8072 clocks.
Reset does not affect this bit.
0 = XOSC not stabilized or no signal on XOSC1 and XOSC2 pins
1 = XOSC clock available for the system clock
Bits 5 and 4 — Reserved
These bits are not used and always read as logic 0.
SYS1 and SYS0 — System Clock Select
These two bits select the system clock source. On reset, the SYS1 and SYS0 bits are initialized to 1
and 0, respectively.
NOTE
Do not switch the system clock to XOSC (SYS1 and SYS0 = 11) when the
XOSC clock is not available. The XOSC clock is available when the STUP
flag is set.
Do not switch the system clock to OSC (SYS1 and SYS 0 = 00, 01, or 10)
when the OSC clock is not available. The OSC clock is available when the
FTUP flag is set.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
67
Oscillators/Clock Distributions
Table 7-6. System Bus Clock Frequency Selection
CPU Bus Frequency (Hz)
SYS1
SYS0
Divide Ratio
OSC = 4.0 M
OSC = 4.1943 M
XOSC = 32.768 k
0
0
OSC ÷ 2
2.0 M
2.0972 M
—
0
1
OSC ÷ 4
1.0 M
1.0486 M
—
1
0
OSC ÷ 64
62.5 k
65.536 k
—
1
1
XOSC ÷ 2
—
—
16.384 k
FOSCE — Fast (Main) Oscillator Enable
The FOSCE bit controls the main oscillator activity. This bit should not be cleared by the CPU when
the main oscillator is selected as the system clock source.
When this bit is cleared:
1. OSC is shut down.
2. 7-bit divider at the OSC input and POR counter are initialized to $0078.
3. FTUP flag is cleared.
When this bit is set:
1. Main oscillator starts again.
2. FTUP flag is set by the POR counter overflow (8072 clocks).
OPTM — Option Map Select
The OPTM bit selects one of two register maps at $0000–$000F. This bit is cleared on reset.
0 = Main register map selected
1 = Option map selected
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
68
Freescale Semiconductor
Chapter 8
Simple Serial Peripheral Interface (SSPI)
8.1 Introduction
The simple serial peripheral interface (SSPI) of the MC68HC05L16 is a master/slave synchronous serial
communication module.
SSPI uses a 3-wire protocol: data input, data output, and serial clock. In this format, the clock is not being
included in the data stream and must be provided as a separate signal.
When the SSPI is enabled (SPE = 1), bits 0–2 of port C become SDI (serial data in), SDO (serial data
out), and SCK (serial clocK) pins. The corresponding DDRC bit does not change the direction of the pin.
The MSTR bit decides the SSPI operation mode. The SCK pin is configured as output in master mode
and configured as input in slave mode.
The DORD bit in the serial peripheral control register (SPCR) selects the data transmission order. When
DORD is set, the least significant bit (LSB) of serial data is shifted out/in first. When the DORD is clear,
serial data is shifted from/to the most significant bit (MSB).
Master serial clock speed is selected by the SPR bit in the SPCR. An interrupt may be generated by the
completion of a transfer.
8.2 Features
Features of the SSPI are:
• Full-duplex, 3-wire synchronous transfers
• Master or slave operation
• Programmable data transmission order, LSB or MSB first
• 1.05-MHz (maximum) transmission bit frequency at 2.1-MHz CPU bus frequency at 5 Vdc
• Two programmable transmission bit rates
• End-of-transmission interrupt flag
• Wakeup from stop mode (slave mode only)
8.3 Functional Descriptions
In master mode, the clock start logic is triggered by the CPU (detection of a CPU write to the 8-bit shift
register (SPDR)). The SCK is based on the internal processor clock. This clock is also used in the 3-bit
counter and 8-bit shift register. See Figure 8-2.
When data is written to the 8-bit shift register of the master device, it is then shifted out to the SDO pin for
application to the slave device. At the same time, data applied from the slave device via the SDI pin is
shifted into the 8-bit shift register.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
69
Simple Serial Peripheral Interface (SSPI)
After 8-bit data is shifted in/out, SCK stops and SPIF is set. If SPIE is enabled, an interrupt request is
generated. The slave device in stop mode wakes up by this interrupt. Further transfers (writes to SPDR)
are inhibited while SPIF is a logic 1.
The master-slave basic interconnection is illustrated in Figure 8-1.
MASTER DEVICE
SLAVE DEVICE
SDO
SPDR
SDI
HFF
SPDR
SCK
HFF
SCK
CLOCK
GENERATOR
CLOCK
GENERATOR
SDI
SDO
Figure 8-1. SSPI Master-Slave Interconnection
8.4 Internal Block Descriptions
This following paragraphs describe the main blocks in the SSPI module. (See Figure 8-2).
HC05 INTERNAL BUS
INTERRUPT
CONTROLS AND
ADDRESS BUS
DATA BUS
CONTROL LOGIC
0 000 00
00 0
SPSR
S
P
I
F
D
C
O
L
SPCR
S
T
A
R
T
S
P
E
SPDR
M S
S P
T R
R
HFF
DORD
CLOCK GENERATOR
SDO
SDI
SCK
Figure 8-2. SSPI Block Diagram
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
70
Freescale Semiconductor
Signal Descriptions
8.4.1 Control
This block is an interface to the HC05 internal bus and generates a start signal when a write to the SPDR
is detected in master mode. It also generates an interrupt request to the CPU.
8.4.2 SPDR
This serial peripheral data register (SPDR) is an 8-bit shift register. The DORD bit in the SPCR determines
the bus connection between the internal data bus and SPDR. This register can be read and written by the
CPU.
8.4.3 SPCR
Bits in the serial peripheral control register (SPCR) control SSPI functions.
8.4.4 SPSR
The serial peripheral status register (SPSR) mainly sets flags such as SPIF and DCOL.
8.4.5 CLKGEN
In master mode, this block generates SCK when the CPU writes to the data register (SPDR) and the clock
rate is selected by the SPR bit in the control register.
In slave mode, the external clock from the SCK pin is used instead of the master mode clock, and SPR
has no affect.
This clock generator includes a 3-bit clock counter. Overflow of this counter sets SPIF.
8.5 Signal Descriptions
Three basic signals — SDI, SDO, and SCK — are described in the following subsections. The relationship
among SCK, SDI, and SDO is shown in Figure 8-3.
8.5.1 SSPI Data I/O (SDI and SDO)
The two serial data lines — SDI for input and SDO for output — are connected to PC0 and PC1,
respectively, when SSPI is enabled (SPE = 1).
At the falling edge of SCK, a serial data bit is transmitted out of the SDO pin. At the rising edge of SCK,
a serial data bit on the SDI pin is sampled internally.
When data is transmitted to other devices via the SDO line, the receiving data is shifted into the shift
register through the SDI pin. This implies full- duplex transmission with both data-out and data-in
synchronized with the same clock signal. Thus, the byte transmitted is replaced by the byte received and
eliminates the need for separate transmit-empty and receiver-full status bits. A single status bit, SPIF, is
used to signify the completion of data transfer.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
71
Simple Serial Peripheral Interface (SSPI)
SCK
SDO
DORD = 0
MSB
BIT6
BIT5
BIT4
BIT3
BIT2
BIT1
LSB
SDI
DORD = 0
MSB
BIT6
BIT5
BIT4
BIT3
BIT2
BIT1
LSB
SDO
DORD = 1
LSB
BIT1
BIT2
BIT3
BIT4
BIT5
BIT6
MSB
SDI
DORD = 1
LSB
BIT1
BIT2
BIT3
BIT4
BIT5
BIT6
MSB
DATA
SAMPLE
Figure 8-3. SSPI Clock-Data Timing Diagram
8.5.2 Serial Clock (SCK)
SCK is used for synchronization of both input and output data streams through its SDI and SDO pins.
The master and slave devices are capable of exchanging a data byte during a sequence of eight clock
pulses. Since the SCK is generated by the master, slave data transfer is accomplished by synchronization
to SCK.
The master generates the SCK through a circuit driven by the internal processor clock and uses the SCK
to latch incoming slave device data on the SDI pin and shift out data to the slave via the SDO pin. The
SPR bit in the SPCR of the master selects the transmission clock rate.
The slave device receives the SCK from the master device, and uses the SCK to latch incoming master
device data on the SDI pin and shifts out data to the master via the SDO pin. The SPR bit in the SPCR of
the slave has no meaning.
NOTE
PC2/SCK should be at VDD level before SSPI is enabled. This can be done
with an internal or external pullup resistor or by setting DDRC2 = 1 and PC2
= 1 prior to enabling the SSPI. Otherwise, the circuit will not initialize
correctly.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
72
Freescale Semiconductor
Registers
8.6 Registers
Three registers in the SSPI provide control, status, and data storage functions. They are:
• Serial peripheral control register, SPCR location $000A
• Serial peripheral status register, SPSR location $000B
• Serial peripheral data register, SPDR location $000C
8.6.1 Serial Peripheral Control Register
Address:
Read:
Write:
Reset:
$000A
Bit 7
6
5
4
3
2
1
Bit 0
SPIE
SPE
DORD
MSTR
0
0
0
SPR
0
0
0
0
0
0
0
0
Figure 8-4. Serial Peripheral Control Register (SPCR)
SPIE — SSPI Interrupt Enable
If the serial peripheral interrupt enable (SPIE) bit is set, an interrupt is generated when SPIF in the
SPSR is set and I bit (interrupt mask bit) in the condition code register (CCR) is clear.
During stop mode, an SSPI request is accepted only in slave mode. Interrupt in master mode will be
pending until stop mode is exited. STOP instruction does not change SPIF and SPIE.
0 = Disable SSPI interrupt
1 = Enable SSPI interrupt
SPE — SSPI Enable
When the SSPI enable (SPE) bit is set, the SSPI system is enabled and connected to the port C pins.
Clearing the SPE bit initializes all control logic in the SSPI modules and disconnects the SSPI from
port C pins.
This bit is cleared on reset.
0 = Disable SSPI
1 = Enable SSPI
DORD — Data Transmission ORDer
When this bit is set, the data in the 8-bit shift register (SPDR) is shifted in/out from the LSB. When this
bit is cleared, the data in the SPDR is shifted in/out from the MSB.
This bit is cleared on reset.
0 = MSB first
1 = LSB first
MSTR — MaSTeR Mode Select
The MSTR bit determines whether the device is in master mode or slave mode.
In master mode (MSTR = 1), the SCK pin is configured as an output and the serial clock is generated
by the internal clock generator when the CPU writes to the SPDR.
In slave mode (MSTR = 0), the SCK pin is configured as an input and the serial clock is applied
externally. This bit is cleared on reset.
0 = Slave mode
1 = Master mode
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
73
Simple Serial Peripheral Interface (SSPI)
Bits 3–1 — Reserved
These bits are not used and are fixed to 0.
SPR — SSPI Clock Rate Select
This serial peripheral clock rate bit selects one of two bit rates of SCK. This bit is cleared on reset.
0 = Internal processor clock divided by 2
1 = Internal processor clock divided by 16
8.6.2 Serial Peripheral Status Register
Address:
Read:
$000B
Bit 7
6
5
4
3
2
1
Bit 0
SPIF
DCOL
0
0
0
0
0
0
0
0
0
0
0
0
0
Write:
Reset:
0
= Unimplemented
Figure 8-5. Serial Peripheral Status Register (SPSR)
SPIF — Serial Transfer Complete Flag
The serial peripheral data transfer complete flag bit notifies the user that a data transfer between the
MC68HC05L16 and an external device has been completed. With the completion of the data transfer,
the rising edge of the eighth pulse sets SPIF, and if SPIE is set, SSPI is generated. However, during
STOP, the interrupt request is serviced only in slave mode. STOP execution never affects the SPIF
flag or SPIE.
When SPIF is set, the ninth clock from the clock generator or from the SCK pin is inhibited.
Clearing the SPIF bit is done by a software sequence of accessing the SPSR while the SPIF bit is set
followed by accessing SPDR (8-bit shift register). This also clears the DCOL bit. While SPIF is set, all
writes to the SPDR are inhibited until SPSR is read by the CPU.
The SPIF bit is a read-only bit and is cleared on reset.
0 = Data transfer not complete
1 = Data transfer complete
DCOL — Data COLlision
The data collision bit notifies the user that an attempt was made to write or read the serial peripheral
data register while a data transfer was taking place with an external device. The transfer continues
uninterrupted; therefore, a write will be unsuccessful, and a data read will be incorrect.
A data collision only sets the DCOL bit and does not generate an SSPI interrupt. The DCOL bit
indicates only the occurrence of data collision.
Clearing the DCOL bit is done by a software sequence of accessing the SPSR while SPIF is set
followed by accessing the SPDR. Both the SPIF and DCOL bits will be cleared by this sequence.
The DCOL bit is cleared on reset.
0 = No data collision
1 = Data collision occurred
Bits 5–0 — Reserved
These bits are not used and are fixed to 0.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
74
Freescale Semiconductor
Port Function
8.6.3 Serial Peripheral Data Register
Address:
Read:
Write:
$000C
Bit 7
6
5
4
3
2
1
Bit 0
MSB
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 2
LSB
Reset:
Unaffected by Reset
Figure 8-6. Serial Peripheral Data Register (SPDR)
Read
A read during transmission causes DCOL to be set.
Write
A write during transmission causes DCOL to be set.
The SPDR is used to transmit and receive data on the serial bus.
In master mode, a write to this register initiates transmission/reception of a data byte.
The SPIF status bit is set at the completion of data byte transmission. A write to the SPDR is inhibited
while this register is shifting (a write attempt sets DCOL) or when the SPIF bit is set without reading SPSR.
Data collision never affects the receiving and transmitting data in SPDR.
A write or read of the SPDR after accessing the SPSR with SPIF set will clear the SPIF and DCOL bits.
The ability to access the SPDR is inhibited when a transmission is taking place. It is important to read the
discussion defining the DCOL and SPIF bits to understand the limits on using the SPDR.
When SSPI is not used (SPE = 0), the SPDR can be used as a general-purpose data storage register.
8.7 Port Function
The SSPI shares I/O pins with PC0–PC2. When SPE is set, PC0 becomes SDI input, PC1 becomes SDO
output and PC2 becomes SCK. The direction of SCK depends on the MSTR bit. Setting DDRC bits 0–2
does not change the data direction of the pin to output, but instead changes the source of data when
PC0–PC2 is read. If DDRCx = 1, port C bit x data latch is read and if DDRCx = 0, PORTCx pin level is
read by the CPU.
When SPE is clear, SSPI is disconnected from the I/O pins and PC0–PC2 are used as general-purpose
I/O pins. See 6.4 Port C.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
75
Simple Serial Peripheral Interface (SSPI)
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
76
Freescale Semiconductor
Chapter 9
Timer System
9.1 Introduction
The MC68HC05L16 has two timer modules: timer 1 with a 16-bit counter and timer 2 with an 8-bit counter.
Timer 1 has one input pin (TCAP) and no output pin. Timer 2 has one input pin (EVI) and one output pin
(EVO). Figure 9-1 illustrates the timer system of MC68HC05L16.
CAP
TCAP
OVF1
TIMER1
16-BIT COUNTER
INPUT
CONTROL 1
CLK1
CMP1
T2CLK
IEDG
EXCLK
EVI
INPUT
CONTROL 2
IM2
CLK2
SEL
TIMER2
8-BIT COUNTER
CMP2
OUTPUT
CONTROL
IL2
O
L
2
PH2
EVO
PRESCALER
O
E
2
TIMER REGISTERS
Figure 9-1. Timer System Block Diagram
9.2 Timer 1
Timer 1 consists of a 16-bit software-programmable counter driven by a fixed divide-by-four prescaler.
This timer can be used for many purposes, including input waveform measurements while simultaneously
generating an output compare interrupt. Pulse widths can vary from several microseconds to many
seconds. See Figure 9-2.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
77
Timer System
INTERNAL BUS
HIGH
BYTE
$16
$17
INTERNAL
PROCESSOR
CLOCK
LOW
BYTE
8-BIT
BUFFER
÷4
OUTPUT
COMPARE
REGISTER
HIGH
BYTE
ICF
OCF
LOW
BYTE
16-BIT FREE
RUNNING
COUNTER
$18
$19
COUNTER
ALTERNATE
REGISTER
$1A
$1B
TOF
LOW
BYTE
INPUT
CAPTURE
REGISTER
$14
$15
EDGE
DETECT
CIRCUIT
OVERFLOW
DETECT
CIRCUIT
OUTPUT
COMPARE
CIRCUIT
TIMER
STATUS
REGULAR
HIGH
BYTE
OUTPUT
LEVEL
REGULAR
$13
ICIE
OCIE
TOIE
IEDG
OLVL
TIMER
CONTROL
REGULAR
$12
D
Q
CLK
C
RESET
(TCMP) OUTPUT
LEVEL
(NOT CONNECTED TO A PIN)
INTERRUPT
CIRCUIT
EDGE
INPUT
(TCAP)
Figure 9-2. Timer 1 Block Diagram
Because the timer has a 16-bit architecture, each specific functional segment (capability) is represented
by two registers. These registers contain the high byte and low byte of that functional segment. Generally,
accessing the low byte of a specific timer function allows full control of that function; however, an access
of the high byte inhibits that specific timer function until the low byte is accessed also.
NOTE
The I bit in the condition code register (CCR) should be set while
manipulating both the high byte and low byte register of a specific timer
function to ensure that an interrupt does not occur.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
78
Freescale Semiconductor
Timer 1
9.2.1 Counter
The key element in the programmable timer is a 16-bit, free-running counter or counter register preceded
by a prescaler that divides the internal processor clock by four. The prescaler gives the timer a resolution
of 2.0 microseconds if the internal bus clock is 2.0 MHz. The counter is incremented during the low portion
of the internal bus clock. Software can read the counter at any time without affecting its value.
The double-byte, free-running counter can be read from either of two locations: $18–$19 (counter
register) or $1A–$1B (counter alternate register). A read from only the least significant byte (LSB) of the
free-running counter ($19, $1B) receives the count value at the time of the read. If a read of the
free-running counter or counter alternate register first addresses the most significant byte (MSB) ($18,
$1A), the LSB ($19, $1B) is transferred to a buffer. This buffer value remains fixed after the first MSB read,
even if the user reads the MSB several times. This buffer is accessed when reading the free-running
counter or counter alternate register LSB ($19 or $1B) and, thus, completes a read sequence of the total
counter value. In reading either the free-running counter or counter alternate register, if the MSB is read,
the LSB must also be read to complete the sequence.
The counter alternate register differs from the counter register in one respect: A read of the counter
register MSB can clear the timer overflow flag (TOF). Therefore, the counter alternate register can be read
at any time without the possibility of missing timer overflow interrupts due to clearing of the TOF.
The free-running counter is configured to $FFFC during reset and is always a read-only register. During
a power-on reset, the counter is also preset to $FFFC and begins running after the oscillator startup delay.
Because the free-running counter is 16 bits preceded by a fixed divided-by-4 prescaler, the value in the
free-running counter repeats every 262,144 internal bus clock cycles. When the counter rolls over from
$FFFF to $0000, the TOF bit is set. An interrupt also can be enabled when counter roll over occurs by
setting its interrupt enable bit (TOIE).
9.2.2 Output Compare Register
The 16-bit output compare register is made up of two 8-bit registers at locations $16 (MSB) and $17
(LSB). The output compare register is used for several purposes, such as indicating when a period of time
has elapsed. All bits are readable and writable and are not altered by the timer hardware or reset. If the
compare function is not needed, the two bytes of the output compare register can be used as storage
locations.
The output compare register contents are compared with the contents of the free-running counter
continually, and if a match is found, the corresponding output compare flag (OCF) bit is set. The output
compare register values should be changed after each successful comparison to establish a new elapsed
timeout. An interrupt also can accompany a successful output compare, provided the corresponding
interrupt enable bit (OCIE) is set.
After a processor write cycle to the output compare register containing the MSB ($16), the output compare
function is inhibited until the LSB ($17) also is written. The user must write both bytes (locations) if the
MSB is written first. A write made only to the LSB ($17) will not inhibit the compare function. The
free-running counter is updated every four internal bus clock cycles. The minimum time required to update
the output compare register is a function of the program rather than the internal hardware.
The processor can write to either byte of the output compare register without affecting the other byte.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
79
Timer System
9.2.3 Input Capture Register
Two 8-bit registers, which make up the 16-bit input capture register, are read-only and are used to latch
the value of the free-running counter after the corresponding input capture edge detector senses a
defined transition. The level transition which triggers the counter transfer is defined by the corresponding
input edge bit (IEDG). Reset does not affect the contents of the input capture register.
The result obtained by an input capture will be one more than the value of the free-running counter on the
rising edge of the internal bus clock preceding the external transition. This delay is required for internal
synchronization. Resolution is one count of the free-running counter, which is four internal bus clock
cycles.
The free-running counter contents are transferred to the input capture register on each proper signal
transition regardless of whether the input capture flag (ICF) is set or clear. The input capture register
always contains the free-running counter value that corresponds to the most recent input capture.
After a read of the input capture register ($14) MSB, the counter transfer is inhibited until the LSB ($15)
is also read. This characteristic causes the timer used in the input capture software routine and its
interaction with the main program to determine the minimum pulse period.
A read of the input capture register LSB ($15) does not inhibit the free-running counter transfer since they
occur on opposite edges of the internal bus clock.
NOTE
Since the TCAP pin is shared with the PC3 I/O pin, changing the state of
the PC3 DDR or data register can cause an unwanted TCAP interrupt. This
can be handled by clearing the ICIE bit before changing the configuration
of PC3 and clearing any pending interrupts before enabling ICIE.
9.2.4 Timer Control Register
The TCR is a read/write register containing five control bits. Three bits enable interrupts associated with
the timer status register flags ICF, OCF, and TOF.
Address:
Read:
Write:
Reset:
$0012
Bit 7
6
5
4
3
2
1
Bit 0
ICIE
OC1IE
TOIE
0
0
0
IEDG
OLVL
0
0
0
0
0
0
U
0
U = Unaffected
Figure 9-3. Timer Control Register (TCR)
ICIE — Input Capture Interrupt Enable
0 = Interrupt disabled
1 = Interrupt enabled
OC1IE — Output Compare 1 Interrupt Enable
0 = Interrupt disabled
1 = Interrupt enabled
TOIE — Timer Overflow Interrupt Enable
0 = Interrupt disabled
1 = Interrupt enabled
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
80
Freescale Semiconductor
Timer 1
IEDG — Input Edge
The value of the input edge determines which level transition on the TCAP pin will trigger free-running
counter transfer to the input capture register.
Reset does not affect the IEDG bit.
0 = Negative edge
1 = Positive edge
Bits 2–4 — Not Used
Always read logic 0
OLVL — Not Used
Always read logic 0
9.2.5 Timer Status Register
The TSR is a read-only register containing three status flag bits.
Address:
Read:
$0013
Bit 7
6
5
4
3
2
1
Bit 0
ICF
OC1F
TOF
0
0
0
0
0
U
U
U
0
0
0
0
0
Write:
Reset:
= Unimplemented
U = Unaffected
Figure 9-4. Timer Status Register (TSR)
ICF — Input Capture Flag
0 = Flag cleared when TSR and input capture low register ($15) are accessed
1 = Flag set when selected polarity edge is sensed by input capture edge detector
OC1F — Output Compare 1 Flag
0 = Flag cleared when TSR and output compare low register ($17) are accessed
1 = Flag set when output compare register contents match the free-running counter contents
TOF — Timer Overflow Flag
0 = Flag cleared when TSR and counter low register ($19) are accessed
1 = Flag set when free-running counter transition from $FFFF to $0000 occurs
Bits 0–4 — Not Used
Always read logic 0
Accessing the timer status register satisfies the first condition required to clear status bits. The remaining
step is to access the register corresponding to the status bit.
A problem can occur when using the timer overflow function and reading the free-running counter at
random times to measure an elapsed time. Without incorporating the proper precautions into software,
the timer overflow flag could unintentionally be cleared if:
1. The timer status register is read or written when TOF is set.
2. The LSB of the free-running counter is read but not for the purpose of servicing the flag.
The counter alternate register at address $1A and $1B contains the same value as the free-running
counter (at address $18 and $19); therefore, this alternate register can be read at any time without
affecting the timer overflow flag in the timer status register.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
81
Timer System
9.2.6 Timer During Wait Mode
The CPU clock halts during wait mode, but timer 1 remains active. If interrupts are enabled, a timer
interrupt will cause the processor to exit wait mode.
9.2.7 Timer During Stop Mode
In stop mode, timer 1 stops counting and holds the last count value if STOP is exited by an interrupt. If
RESET is used, the counter is forced to $FFFC. During STOP, if at least one valid input capture edge
occurs at the TCAP pin, the input capture detect circuit is armed. This does not set any timer flags or wake
up the MCU. When the MCU does wake up, there is an active input capture flag and data from the first
valid edge that occurred during stop mode. If RESET is used to exit stop mode, then no input capture flag
or data remains, even if a valid input capture edge occurred.
9.3 Timer 2
Timer 2 is an 8-bit event counter which has one compare register, one event input pin (EVI), and one
event output pin (EVO). The event counter is clocked by the external clock (EXCLK) or prescaled system
clock (CLK2), selected by the T2CLK bit in the TCR2 register. The EXCLK may be EVI direct or EVI gated
by CLK2, which is selected by the IM2 bit at the EVI block (see 9.3.6 Timer Input 2 (EVI)).
Timer 2 may be used as a modulus clock divider with EVO pin, free-running counter (when compare
register is $00), or periodic interrupt timer.
The timer counter 2 (TCNT2) is an 8-bit up counter with preset input. The counter is preset to $01 by a
CMP2 signal from the comparator or by a CPU write to it that is done while the system clock (PH2) is low.
COUNTER
WRITE
CLK2
0
$01
E
EXCLK
1
$01
S
COUNTER 2
L
T2CLK
CMP2
COMPARATOR 2
BUFFER 2
TRANSFER
TRANSFER
REGISTER (OC2)
Figure 9-5. Timer 2 Block Diagram
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
82
Freescale Semiconductor
Timer 2
OC2 = 2, 3, 4 . . . FF, 0
COUNT UP
COUNT UP
COUNT UP
COMPARE
PH2
TIMCLK
PRESET
COUNTER2
N
OC2 (BUFFER)
N
01
CMP2
EVO
OC2 = 1
COUNT UP
COUNT UP
COUNT UP
PRESET
PRESET
COMPARE
PH2
TIMCLK
PRESET
COUNTER2
01
OC2 (BUFFER)
01
01
CMP2
EVO
Figure 9-6. Timer 2 Timing Diagram for f(PH2) > f(TIMCLK)
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
83
Timer System
OC2 = 2, 3, 4 . . . FF, 0
1
1
1
2
1
2
2
2
PH2
TIMCLK
3
COUNTER2
N-1
N
OC2 (BUFFER)
01
02
N
CMP2
EVO
Legend:
COUNT UP
COMPARE
PRESET that overrides COUNT UP
OC2 = 1
1
1
1
2
1
2
2
2
PH2
TIMCLK
3
COUNTER2
3
01
3
01
3
01
01
01
OC2 (BUFFER)
CMP2
EVO
Legend:
COUNT UP
COMPARE
PRESET that overrides COUNT UP
Figure 9-7. Timer 2 Timing Diagram for f(PH2) = f(TIMCLK)
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
84
Freescale Semiconductor
Timer 2
The CLK2 from the prescaler or the EXTCLK from the EVI block is selected as timer clock by the T2CLK
bit in the TCR2 register. The CLK2 and the EXCLK are synchronized to the falling edge of system clock
in the prescaler and the EVI blocks. The minimum pulse width of CLK2 is the same as the system clock,
and the minimum pulse width of EXCLK (event mode) is one PH2 cycle. When the EXCLK (event mode)
is selected, 50% duty is not guaranteed.
The counter is incremented by the falling edge of the timer clock and the period between two falling edges
is defined as one timer cycle in the following description.
The compare register (OC2) is provided for comparison with the timer counter 2 (TCNT2). The OC2 data
is transferred to the buffer register when the counter is preset by a CPU write or by a compare output
(CMP2). This buffer register is compared with the timer counter 2 (TCNT2).
The comparison between the counter and the OC2 buffer register is done when the system clock is high
in each bus cycle. If the counter matches with the OC2 buffer register, the comparator latches this result
during the current timer cycle. When the next timer cycle begins, the comparator outputs CMP2 signal (if
the compare match is detected during previous timer cycle). This CMP2 is used in the counter preset data
transfer to the buffer register, setting OC2F in the TSR2 and the EVO block. The counter preset overrides
the counter increment.
The OC2F bit may generate interrupt requests if the OC2IE bit in the TCR2 is set.
9.3.1 Timer Control Register 2
Address:
Read:
Write:
Reset:
$001C
BIt 7
6
5
4
3
2
1
Bit 0
TI2IE
OC2IE
0
T2CLK
IM2
IL2
OE2
OL2
0
0
0
0
0
0
0
0
Figure 9-8. Timer Control Register 2 (TCR2)
TI2IE — Timer Input 2 Interrupt Enable
The TI2IE bit enables timer input 2 (EVI) interrupt when TI2F is set. This bit is cleared on reset.
0 = Timer input 2 interrupt disabled
1 = Timer input 2 interrupt enabled
OC2IE — Compare 2 Interrupt Enable
The OC2IE bit enables compare 2 (CMP2) interrupt when compare match is detected (OC2F is set).
This bit is cleared on reset.
0 = Timer input 2 interrupt disabled
1 = Timer input 2 interrupt enabled
Bit 5 — Reserved
This bit is not used and is always read as logic 0.
T2CLK — Timer 2 Clock Select
The T2CLK bit selects the clock source for the timer counter 2. This bit is cleared on reset.
0 = CLK2 from prescaler selected
1 = EXCLK from EVI input block selected
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
85
Timer System
IM2 — Timer Input 2 Mode Select
The IM2 bit selects whether EVI input is gated or not gated by CLK2. This bit is cleared on reset.
0 = EVI not gated by CLK2 (event mode)
1 = EVI gated by CLK2 (gate mode)
IL2 — Timer Input 2 Active Edge (Level) Select
The IL2 bit selects the active edge of EVI to increment the counter for event mode (IM2 = 0) or gate
enable level of EVI for gate mode
(IM2 = 1). This bit is cleared on reset.
0 = Falling edge selected (event mode)
Low level enables counting (gate mode)
1 = Rising edge selected (event mode)
High level enables counting (gate mode)
Table 9-1. EVI Modes Selection
IM2
IL2
Action on Clock
0
0
Falling edge of EVI increments counter
0
1
Rising edge of EVI increments counter
1
0
Low level on EVI enables counting
1
1
High level on EVI enables counting
OE2 — Timer Output 2 (EVO) Output Enable
The OE2 bit enables EVO output on the PC5 pin. When this bit is changed, control of the pin is delayed
(synchronized) until the next active edge of EVO is selected by the OL2 bit. This bit is cleared on reset.
0 = EVO output disabled
1 = EVO output enabled
OL2 — Timer Output 2 Edge Select for Synchronization
The OL2 bit selects which edge of EVO clock should be synchronized by the OE2 bit control. The OL2
bit also decides the initial value of the CMP2 divider, when counter 2 is written to by the CPU. This bit
is cleared on reset.
0 = The falling edge of EVO switches EVO output and PC5 if the OE2 bit has been changed.
1 = The rising edge of EVO switches EVO output and PC5 if the OE2 bit has been changed.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
86
Freescale Semiconductor
Timer 2
9.3.2 Timer Status Register 2
Address:
Read:
$001D
BIt 7
6
TI2F
OC2F
Write:
Reset:
0
0
5
4
0
0
0
0
3
2
0
0
RTI2F
ROC2F
0
0
1
Bit 0
0
0
0
0
= Unimplemented
Figure 9-9. Timer Status Register 2 (TSR2)
TI2F — Timer Input 2 (EVI) Interrupt Flag
In event mode, the event edge sets TI2F. In gated time accumulation mode, the trailing edge of the
gate signal at the EVI input pin sets TI2F. When the TI2IE bit and this bit are set, an interrupt is
generated. This bit is a read-only bit and writes have no effect. The TI2F is cleared by writing a logic 1
to the RTI2F bit and on reset.
OC2F — Compare 2 Interrupt Flag
The OC2F bit is set when compare match is detected between counter 2 and OC2 register. When
OC2IE bit and this bit are set, an interrupt is generated. This bit is a read-only bit and writes have no
effect. The OC2F is cleared by writing a logic 1 to ROC2F bit and on reset.
Bits 5 and 4 — Reserved
These bits are not used and always read as logic 0.
RTI2F — Reset Timer Input 2 Flag
The RTI2F bit is a write-only bit and always reads as logic 0. Writing logic 1 to this bit clears the TI2F
bit and writing a logic 0 to this bit has no effect.
ROC2F — Reset Output Compare 2 Flag
The ROC2F bit is a write-only bit and always reads as logic 0. Writing logic 1 to this bit clears the OC2F
bit and writing a logic 0 to this bit has no effect.
Bits 1 and 0 — Reserved
These bits are not used and always read as logic 0.
9.3.3 Output Compare Register 2
Address:
Read:
Write:
Reset:
$001E
BIt 7
6
5
4
3
2
1
Bit 0
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
0
0
0
0
0
0
0
0
Figure 9-10. Output Compare Register 2 (OC2)
The OC2 register data is transferred to the buffer register when the CPU writes to TCNT2, when the
CMP2 presets the TCNT2, or when system resets.
When the OC2 buffer register matches the TCNT2 register, the OC2F bit in the TSR2 register is set and
TCNT2 is preset to $01.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
87
Timer System
9.3.4 Timer Counter Register 2
Address:
Read:
Write:
Reset:
$001F
BIt 7
6
5
4
3
2
1
Bit 0
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
0
0
0
0
0
0
0
1
Figure 9-11. Timer Counter Register 2 (TCNT2)
TCNT2 is incremented by the falling edge of the timer clock, which is synchronized and has the same
timing as the falling edge of PH2.
The TCNT2 register is compared with the OC2 buffer register and initialized to $01 if it matches. It is also
initialized to $01 on reset and any CPU write to this register.
The CPU read of this counter should be done while PH2 is high. Data may be latched by the local or main
data bus while PH2 is low.
9.3.5 Timebase Control Register 1
Address:
Read:
Write:
Reset:
$0010
BIt 7
6
5
4
3
2
1
Bit 0
TBCLK
0
LCLK
0
0
0
T2R1
T2R0
0
0
0
0
0
0
0
0
Figure 9-12. Timebase Control Register 1 (TBCR1)
T2R1/T2R0 — Prescale Rate Select Bits for Timer 2
The T2R1 and T2R0 bits select prescale rate of CLK2 for timer 2 and timer input 2. These bits are
cleared on reset.
Table 9-2. Timebase Prescale Rate Selection
T2R1
T2R0
System Clock
Divided by
0
0
1
0
1
4
1
0
32
1
1
256
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
88
Freescale Semiconductor
Timer 2
9.3.6 Timer Input 2 (EVI)
The event input (EVI) is used as an external clock input for timer 2.
TO TI2F
PC4
EVI
SYNC
PC4
PH2
ACTIVE
EDGE/LEVEL
SELECTOR
IL2
GATE/EVENT
MODE
CONTROL
IM2
EXCLK
CLK2
Figure 9-13. EVI Block Diagram
Since the external clock may be asynchronous to the internal clock, this input has a synchronizer which
samples external clock by the internal system clock. (The input transition synchronizes to the falling edge
of PH2. Therefore, to be measured, the minimum pulse width for EVI must be larger than one system
clock.)
The IM2 and IL2 bits in the TCR2 determine how this synchronized external clock is used. The IM2 bit
decides between event mode and gate mode, and the IL2 bit decides which level or edge is activated.
In event mode (IM2 = 0), the external clock drives the timer 2 counter directly and the active edge at the
EVI pin is selected by the IL2 bit. When an active edge is detected, the TI2F bit in the TCR2 is set.
Table 9-3. EVI Modes Selection
IM2
IL2
Action on Clock
0
0
Falling edge of EVI increments counter
0
1
Rising edge of EVI increments counter
1
0
Low level on EVI enables counting
1
1
High level on EVI enables counting
NOTE
Since the EVI pin is shared with the PC4 I/O pin, DDRC4 should always be
cleared whenever EVI is used. EVI should not be used when DDRC4 is
high.
In gate mode (IM2 = 1), the EVI input is gated by CLK2 from the prescaler and gate output drives the timer
2 counter. The IL2 bit decides active level of the external input. When the transition from active level to
inactive level is detected, the TI2F bit is set.
Changing the IM2 bit may cause an illegal count up of TCNT2, thus presetting TCNT2 after initializing IM2
is required.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
89
Timer System
IM2 = 0 Event Mode
EVI
PH2
EXCLK
IL2 = 0
COUNTER
X
X+1
X+2
EXCLK
IL2 = 1
COUNTER
X
X+1
X+2
IM2 = 1 Gate Mode
EVI
SYNCHRONIZED
CLK2
EXCLK
IL2 = 0
COUNTER
EXCLK
IL2 = 1
COUNTER
Figure 9-14. EVI Timing Diagram
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
90
Freescale Semiconductor
Timer 2
9.3.7 Event Output (EVO)
The EVO pin is the clock output pin of timer 2. The compare output from the timer 2 (CMP2) is divided in
this block for 50% duty output signal. This 1/2 divider is initialized to the level of the OL2 bit when the timer
counter 2 is written to by the CPU (initialized). When the OE2 bit in the timer control register 2 (TCR2) is
set, the EVO output is activated, and, when OE2 is cleared, EVO is deactivated. These controls must be
done synchronously to the EVO output signal to avoid an incomplete pulse on the pin. The OL2 bit in the
TCR2 decides which edge of EVO should be synchronized.
When the DDRC5 bit is set or the synchronized output enable is high (clock on), the output buffer at the
EVO/PC5 pin is enabled. If the DDRC5 bit is set to 1, the pin state during the idling condition (clock off)
depends on the PC5 output data latch. If the DDRC5 bit is cleared, the pin becomes high impedance
during clock off.
DDRC5
OE2
D
Q
OL2
C
CMP2
1
1/2
PC5
SEL
EVO
0
CNTR2
WRITE
PC5 (OUT)
PC5 (IN)
Figure 9-15. EVO Block Diagram
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
91
Timer System
OL2 = 0
CNTR2 WRITE
CMP2
OE2
CMP2/2
EVO
PC5 = 0/EVO
OL2 = 1
CMP2
OE2
CMP2/2
EVO
PC5 = 1/EVO
Figure 9-16. EVO Timing Diagram
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
92
Freescale Semiconductor
Prescaler
9.4 Prescaler
The 8-bit prescaler in the timer system divides system clock (PH2) and provides divided clock to each
timer and event input.
CLK1 for timer 1 is a fixed frequency clock (PH2/PH4).
CLK2 for timer 2 is selected by T2R1 and T2R0 bits in the TBCR1, and this clock is also used as the event
input for gate mode. The CLK2 transitions must be synchronous to the falling edge of PH2.
Table 9-4. Timebase Prescale Rate Selection
T2R1
T2R0
System Clock
Divided by
0
0
1
0
1
4
1
0
32
1
1
256
RST
PH2
1
4
8-BIT DIVIDER
SEL
1111
CLK1
FOR TIMER 1
CLK2
FOR TIMER 2
T2R0
T2R1
1432256
Figure 9-17. Prescaler Block Diagram
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
93
Timer System
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
94
Freescale Semiconductor
Chapter 10
LCD Driver
10.1 Introduction
The liquid crystal display (LCD) driver may be configured with four backplanes (BP) and 39 frontplanes
(FP) maximum. The VDD voltage is the highest level of the output waveform and the lower three levels
are applied from VLCD1, VLCD2, and VLCD3 inputs.
On reset, LCD enable bit (LCDE) in the LCD control register (LCDCR) is cleared (LCD drivers at a
disabled state) and all BP pins and FP pins output VDD levels.
The LCD clock is generated by the timebase module, and the LCLK bit in the TBCR1 selects the clock
frequency.
10.2 LCD Waveform Examples
Figure 10-1, Figure 10-2, Figure 10-3, and Figure 10-4 illustrate the LCD timing examples.
DUTY = 1/1 (STATIC)
BIAS = 1/1 (VLCD1 = VDD, VLCD2 = VLCD3 = VDD–VLCD)
1FRAME
VDD, VLCD1
BP0
VLCD2, 3
FPx
(XXX1)
VDD, VLCD1
FPy
(XXX1)
VDD, VLCD1
VLCD2, 3
VLCD2, 3
+VLCD
BP0–FPx
(OFF)
0
–VLCD
+VLCD
BP0–FPy
(ON)
0
–VLCD
Figure 10-1. LCD 1/1 Duty and 1/1 Bias Timing Diagram
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
95
LCD Driver
DUTY = 1/2
BIAS = 1/2 (VLCD1 = VLCD2 = VDD–VLCD/2, VLCD3 = VDD–VLCD)
1 FRAME
VDD
VLCD1, 2
BP0
VLCD3
VDD
BP1
VLCD1, 2
VLCD3
VDD
FPX
(XX01)
VLCD1, 2
VLCD3
VDD
FPY
(XX00)
VLCD1, 2
VLCD3
VLCD
VLCD/2
BP0–FPX
(ON)
0
–VLCD/2
–VLCD
VLCD
VLCD/2
BP1–FPX
(OFF)
0
–VLCD/2
–VLCD
VLCD
VLCD/2
BP0–FPY
(OFF)
0
–VLCD/2
–VLCD
Figure 10-2. LCD 1/2 Duty and 1/2 Bias Timing Diagram
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
96
Freescale Semiconductor
LCD Waveform Examples
DUTY = 1/3
BIAS = 1/3 (VLCD1 = VDD–VLCD/3, VLCD2 = VDD–2VLCD/3, VLCD3 = VDD–VLCD)
1FRAME
VDD
VLCD1
BP0
VLCD2
VLCD3
VDD
VLCD1
BP1
VLCD2
VLCD3
VDD
VLCD1
BP2
VLCD2
VLCD3
VDD
VLCD1
FPx
(X010)
VLCD2
VLCD3
+VLCD
+2VLCD/3
+VLCD/3
BP0–FPx
(OFF)
0
–VLCD/3
–2VLCD/3
–VLCD
+VLCD
+2VLCD/3
+VLCD/3
BP1–FPx
(ON)
0
–VLCD/3
–2VLCD/3
–VLCD
Figure 10-3. LCD 1/3 Duty and 1/3 Bias Timing Diagram
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
97
LCD Driver
DUTY = 1/4
BIAS = 1/3 (VLCD1 = VDD–VLCD/3, VLCD2 = VDD–2VLCD/3, VLCD3 = VDD–VLCD)
1FRAME
VDD
VLCD1
BP0
VLCD2
VLCD3
VDD
VLCD1
BP1
VLCD2
VLCD3
VDD
VLCD1
BP2
VLCD2
VLCD3
VDD
VLCD1
VLCD2
BP3
VLCD3
VDD
VLCD1
FPX
(1001)
VLCD2
VLCD3
+VLCD
+2VLCD/3
+VLCD/3
BP0–FPX
(ON)
0
–VLCD/3
–2VLCD/3
–VLCD
+VLCD
+2VLCD/3
+VLCD/3
BP1–FPX
(OFF)
0
–VLCD/3
–2VLCD/3
–VLCD
Figure 10-4. LCD 1/4 Duty and 1/3 Bias Timing Diagram
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
98
Freescale Semiconductor
Backplane Driver and Port Selection
10.3 Backplane Driver and Port Selection
The number of backplane (port D) pins depends on the LCD duty. It is automatically selected by DUTY1
and DUTY0 bits in the LCD control register (LCDCR). On reset, these bits are cleared and 1/4 duty is
selected. (See Table 10-1.)
Table 10-1. Backplane and Port Selection
LCD Control
Duty
Pin Selection
DUTY1
DUTY0
BP3/PD3
BP2/PD2
BP1/PD1
BP0
1/1
0
1
PD3
PD2
PD1
BP0
1/2
1
0
PD3
PD2
BP1
BP0
1/3
1
1
PD3
BP2
BP1
BP0
1/4
0
0
BP3
BP2
BP1
BP0
10.4 Frontplane Driver and Port Selection
The number of frontplane (FP) pins depends on the number of port D and port E bits. If port bits are
selected as a parallel output port, the number of the FP pins is decreased to 27 as a minimum. The
selections between frontplane and port (nibble wide) are done by the PEH, PEL, and PDH bits in the
LCDCR (see Table 10-2). These bits also can be controlled on a bit-wide basis by using the PDMUX and
PEMUX registers. PDH, PEH, and PEL have priority over the mux registers. On reset, port D and port E
bits are disconnected and FP27–FP38 pins output VDD levels.
Table 10-2. Frontplane and Port Selection
FP / Port Control
PEH
PEL
Port Selection
FP31:FP34/
PE3:PE0
FP35:FP38/
PD7:PD4
PDMx
0
0
FP35:FP38
0
1
Varied
1
X
PD7:PD4
0
PEMx
FP27:FP30/
PE7:PE4
PDH
0
FP31:FP34
0
1
Varied
1
X
PE3:PE0
0
0
FP27:FP30
0
1
1
Varied
1
X
X
PE7:PE4
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
99
LCD Driver
10.5 LCD Control Register
Address:
Read:
Write:
Reset:
$0020
Bit 7
6
5
4
3
2
1
Bit 0
LCDE
DUTY1
DUTY0
0
PEH
PEL
PDH
0
0
0
0
0
0
0
0
0
Figure 10-5. LCD Control Register (LCDCR)
LCDE — LCD Output Enable
The LCDE bit enables all BP and FP outputs. (This bit does not affect PEH, PEL, or PDH bits.) This
bit is cleared on reset.
0 = All dedicated FP pins output highest (VDD) level; BP and FP pins are shared with an output port
data.
1 = All BP and FP pins output LCD waveforms.
DUTY1 and DUTY0 — LCD Duty Select
The DUTY1 and DUTY0 bits select the duty of the LCD driver. The number of BP pins is related to this
duty selection. The unused BP pin is used as a port D pin. Default duty is 1/4 duty. These bits are
cleared on reset. See Table 10-1.
Bit 4 — Reserved
This bit is not used and always reads as logic 0.
PEH — Select Port E (H)
The PEH bit enables the upper four bits of port E instead of LCD drivers. This bit is cleared on reset.
See 10.4 Frontplane Driver and Port Selection.
0 = FP27–FP30 selected
1 = PE7–PE4 selected
PEL — Select Port E (L)
The PEL bit enables the lower four bits of port E instead of LCD drivers. This bit is cleared on reset.
See 10.4 Frontplane Driver and Port Selection.
0 = FP31–FP34 selected
1 = PE3–PE0 selected
PDH — Select Port D (H)
The PDH bit enables the upper four bits of port D instead of LCD drivers. This bit is cleared on reset.
See 10.4 Frontplane Driver and Port Selection.
0 = FP35–FP38 selected
1 = PD7–PD4 selected
Bit 0 — Reserved
This bit is not used and is always read as logic 0.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
100
Freescale Semiconductor
LCD Data Register
10.6 LCD Data Register
Address:
$0021–$0034
FP (2x–1)
Read:
Write:
FP (2x–2)
Bit 7
6
5
4
3
2
1
Bit 0
BP3
BP2
BP1
BP0
BP3
BP2
BP1
BP0
Reset:
Unaffected by reset
Figure 10-6. LDC Data Registers
LCDRx — LCD Data Registers
Data in the LCDRx (LCDR1–LCDR20) controls the waveform of the two frontplane drivers. Bits 0–3
and bits 4–7 of this register decide the waveforms at the BP0–BP3 timings. If the LCD duty is not 1/4,
the register bit for the unused backplane has no meaning. The upper four bits of LCDR20 are not
implemented and unknown data may be read. (See Table 10-3.)
0 = Output deselect waveform at the corresponding backplane timing
1 = Output select waveform at the corresponding backplane timing
Table 10-3. Frontplane Data Register Bit Usage
Duty
1/1
Frontplane Data Register Bit Usage
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
—
—
—
BP0
—
—
—
BP0
1/2
—
—
BP1
BP0
—
—
BP1
BP0
1/3
—
BP2
BP1
BP0
—
BP2
BP1
BP0
1/4
BP3
BP2
BP1
BP0
BP3
BP2
BP1
BP0
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
101
LCD Driver
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
102
Freescale Semiconductor
Chapter 11
Instruction Set
11.1 Introduction
The microcontroller unit (MCU) instruction set has 62 instructions and uses eight addressing modes. The
instructions include all those of the M146805 CMOS (complementary metal-oxide semiconductor) Family
plus one more: the unsigned multiply (MUL) instruction. The MUL instruction allows unsigned
multiplication of the contents of the accumulator (A) and the index register (X). The high-order product is
stored in the index register, and the low-order product is stored in the accumulator.
11.2 Addressing Modes
The central processor unit (CPU) uses eight addressing modes for flexibility in accessing data. The
addressing modes provide eight different ways for the CPU to find the data required to execute an
instruction. The eight addressing modes are:
• Inherent
• Immediate
• Direct
• Extended
• Indexed, no offset
• Indexed, 8-bit offset
• Indexed, 16-bit offset
• Relative
11.2.1 Inherent
Inherent instructions are those that have no operand, such as return from interrupt (RTI) and stop (STOP).
Some of the inherent instructions act on data in the CPU registers, such as set carry flag (SEC) and
increment accumulator (INCA). Inherent instructions require no operand address and are one byte long.
11.2.2 Immediate
Immediate instructions are those that contain a value to be used in an operation with the value in the
accumulator or index register. Immediate instructions require no operand address and are two bytes long.
The opcode is the first byte, and the immediate data value is the second byte.
11.2.3 Direct
Direct instructions can access any of the first 256 memory locations with two bytes. The first byte is the
opcode, and the second is the low byte of the operand address. In direct addressing, the CPU
automatically uses $00 as the high byte of the operand address.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
103
Instruction Set
11.2.4 Extended
Extended instructions use three bytes and can access any address in memory. The first byte is the
opcode; the second and third bytes are the high and low bytes of the operand address.
When using the Freescale assembler, the programmer does not need to specify whether an instruction is
direct or extended. The assembler automatically selects the shortest form of the instruction.
11.2.5 Indexed, No Offset
Indexed instructions with no offset are 1-byte instructions that can access data with variable addresses
within the first 256 memory locations. The index register contains the low byte of the effective address of
the operand. The CPU automatically uses $00 as the high byte, so these instructions can address
locations $0000–$00FF.
Indexed, no offset instructions are often used to move a pointer through a table or to hold the address of
a frequently used random-access memory (RAM) or input/output (I/O) location.
11.2.6 Indexed, 8-Bit Offset
Indexed, 8-bit offset instructions are 2-byte instructions that can access data with variable addresses
within the first 511 memory locations. The CPU adds the unsigned byte in the index register to the
unsigned byte following the opcode. The sum is the effective address of the operand. These instructions
can access locations $0000–$01FE.
Indexed 8-bit offset instructions are useful for selecting the kth element in an n-element table. The table
can begin anywhere within the first 256 memory locations and could extend as far as location 510
($01FE). The k value is typically in the index register, and the address of the beginning of the table is in
the byte following the opcode.
11.2.7 Indexed, 16-Bit Offset
Indexed, 16-bit offset instructions are 3-byte instructions that can access data with variable addresses at
any location in memory. The CPU adds the unsigned byte in the index register to the two unsigned bytes
following the opcode. The sum is the effective address of the operand. The first byte after the opcode is
the high byte of the 16-bit offset; the second byte is the low byte of the offset.
Indexed, 16-bit offset instructions are useful for selecting the kth element in an n-element table anywhere
in memory.
As with direct and extended addressing, the Freescale assembler determines the shortest form of
indexed addressing.
11.2.8 Relative
Relative addressing is only for branch instructions. If the branch condition is true, the CPU finds the
effective branch destination by adding the signed byte following the opcode to the contents of the program
counter. If the branch condition is not true, the CPU goes to the next instruction. The offset is a signed,
two’s complement byte that gives a branching range of –128 to +127 bytes from the address of the next
location after the branch instruction.
When using the Freescale assembler, the programmer does not need to calculate the offset, because the
assembler determines the proper offset and verifies that it is within the span of the branch.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
104
Freescale Semiconductor
Instruction Types
11.3 Instruction Types
The MCU instructions fall into these five categories:
• Register/memory instructions
• Read-modify-write instructions
• Jump/branch instructions
• Bit manipulation instructions
• Control instructions
11.3.1 Register/Memory Instructions
These instructions operate on central processor unit (CPU) registers and memory locations. Most of them
use two operands. One operand is in either the accumulator or the index register. The CPU finds the other
operand in memory.
Table 11-1. Register/Memory Instructions
Instruction
Mnemonic
Add Memory Byte and Carry Bit to Accumulator
ADC
Add Memory Byte to Accumulator
ADD
AND Memory Byte with Accumulator
AND
Bit Test Accumulator
BIT
Compare Accumulator
CMP
Compare Index Register with Memory Byte
CPX
EXCLUSIVE OR Accumulator with Memory Byte
EOR
Load Accumulator with Memory Byte
LDA
Load Index Register with Memory Byte
LDX
Multiply
MUL
OR Accumulator with Memory Byte
ORA
Subtract Memory Byte and Carry Bit from Accumulator
SBC
Store Accumulator in Memory
STA
Store Index Register in Memory
STX
Subtract Memory Byte from Accumulator
SUB
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
105
Instruction Set
11.3.2 Read-Modify-Write Instructions
These instructions read a memory location or a register, modify its contents, and write the modified value
back to the memory location or to the register.
NOTE
Do not use read-modify-write operations on write-only registers.
Table 11-2. Read-Modify-Write Instructions
Instruction
Mnemonic
Arithmetic Shift Left (Same as LSL)
ASL
Arithmetic Shift Right
ASR
Bit Clear
BCLR(1)
Bit Set
BSET(1)
Clear Register
CLR
Complement (One’s Complement)
COM
Decrement
DEC
Increment
INC
Logical Shift Left (Same as ASL)
LSL
Logical Shift Right
LSR
Negate (Two’s Complement)
NEG
Rotate Left through Carry Bit
ROL
Rotate Right through Carry Bit
ROR
Test for Negative or Zero
TST(2)
1. Unlike other read-modify-write instructions, BCLR and
BSET use only direct addressing.
2. TST is an exception to the read-modify-write sequence
because it does not write a replacement value.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
106
Freescale Semiconductor
Instruction Types
11.3.3 Jump/Branch Instructions
Jump instructions allow the CPU to interrupt the normal sequence of the program counter. The
unconditional jump instruction (JMP) and the jump-to-subroutine instruction (JSR) have no register
operand. Branch instructions allow the CPU to interrupt the normal sequence of the program counter
when a test condition is met. If the test condition is not met, the branch is not performed.
The BRCLR and BRSET instructions cause a branch based on the state of any readable bit in the first
256 memory locations. These 3-byte instructions use a combination of direct addressing and relative
addressing. The direct address of the byte to be tested is in the byte following the opcode. The third byte
is the signed offset byte. The CPU finds the effective branch destination by adding the third byte to the
program counter if the specified bit tests true. The bit to be tested and its condition (set or clear) is part of
the opcode. The span of branching is from –128 to +127 from the address of the next location after the
branch instruction. The CPU also transfers the tested bit to the carry/borrow bit of the condition code
register.
Table 11-3. Jump and Branch Instructions
Instruction
Mnemonic
Branch if Carry Bit Clear
BCC
Branch if Carry Bit Set
BCS
Branch if Equal
BEQ
Branch if Half-Carry Bit Clear
BHCC
Branch if Half-Carry Bit Set
BHCS
Branch if Higher
BHI
Branch if Higher or Same
BHS
Branch if IRQ Pin High
BIH
Branch if IRQ Pin Low
BIL
Branch if Lower
BLO
Branch if Lower or Same
BLS
Branch if Interrupt Mask Clear
BMC
Branch if Minus
BMI
Branch if Interrupt Mask Set
BMS
Branch if Not Equal
BNE
Branch if Plus
BPL
Branch Always
BRA
Branch if Bit Clear
Branch Never
Branch if Bit Set
BRCLR
BRN
BRSET
Branch to Subroutine
BSR
Unconditional Jump
JMP
Jump to Subroutine
JSR
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
107
Instruction Set
11.3.4 Bit Manipulation Instructions
The CPU can set or clear any writable bit in the first 256 bytes of memory, which includes I/O registers
and on-chip RAM locations. The CPU can also test and branch based on the state of any bit in any of the
first 256 memory locations.
Table 11-4. Bit Manipulation Instructions
Instruction
Bit Clear
Mnemonic
BCLR
Branch if Bit Clear
BRCLR
Branch if Bit Set
BRSET
Bit Set
BSET
11.3.5 Control Instructions
These instructions act on CPU registers and control CPU operation during program execution.
Table 11-5. Control Instructions
Instruction
Mnemonic
Clear Carry Bit
CLC
Clear Interrupt Mask
CLI
No Operation
NOP
Reset Stack Pointer
RSP
Return from Interrupt
RTI
Return from Subroutine
RTS
Set Carry Bit
SEC
Set Interrupt Mask
SEI
Stop Oscillator and Enable IRQ Pin
STOP
Software Interrupt
SWI
Transfer Accumulator to Index Register
TAX
Transfer Index Register to Accumulator
TXA
Stop CPU Clock and Enable Interrupts
WAIT
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
108
Freescale Semiconductor
Instruction Set Summary
11.4 Instruction Set Summary
ADD #opr
ADD opr
ADD opr
ADD opr,X
ADD opr,X
ADD ,X
AND #opr
AND opr
AND opr
AND opr,X
AND opr,X
AND ,X
ASL opr
ASLA
ASLX
ASL opr,X
ASL ,X
— IMM
DIR
EXT
IX2
IX1
IX
2
A9 ii
B9 dd 3
C9 hh ll 4
D9 ee ff 5
4
E9 ff
3
F9
— IMM
DIR
EXT
IX2
IX1
IX
2
AB ii
BB dd 3
CB hh ll 4
DB ee ff 5
4
EB ff
3
FB
— — —
IMM
DIR
EXT
IX2
IX1
IX
2
A4 ii
B4 dd 3
C4 hh ll 4
D4 ee ff 5
4
E4 ff
3
F4
38
48
58
68
78
dd
— — DIR
INH
INH
IX1
IX
DIR
INH
INH
IX1
IX
37
47
57
67
77
dd
REL
Effect
on CCR
Description
H I N Z C
A ← (A) + (M) + (C)
Add with Carry
A ← (A) + (M)
Add without Carry
A ← (A) ∧ (M)
Logical AND
Arithmetic Shift Left (Same as LSL)
C
0
b7
ASR opr
ASRA
ASRX
ASR opr,X
ASR ,X
Arithmetic Shift Right
BCC rel
Branch if Carry Bit Clear
b0
C
b7
— — b0
PC ← (PC) + 2 + rel ? C = 0
ff
5
3
3
6
5
5
3
3
6
5
24
rr
3
DIR (b0)
DIR (b1)
DIR (b2)
DIR (b3)
— — — — —
DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
11
13
15
17
19
1B
1D
1F
dd
dd
dd
dd
dd
dd
dd
dd
5
5
5
5
5
5
5
5
PC ← (PC) + 2 + rel ? C = 1
— — — — —
REL
25
rr
3
Mn ← 0
— — — — —
ff
Cycles
Opcode
ADC #opr
ADC opr
ADC opr
ADC opr,X
ADC opr,X
ADC ,X
Operation
Address
Mode
Source
Form
Operand
Table 11-6. Instruction Set Summary (Sheet 1 of 6)
BCLR n opr
Clear Bit n
BCS rel
Branch if Carry Bit Set (Same as BLO)
BEQ rel
Branch if Equal
PC ← (PC) + 2 + rel ? Z = 1
— — — — —
REL
27
rr
3
BHCC rel
Branch if Half-Carry Bit Clear
PC ← (PC) + 2 + rel ? H = 0
— — — — —
REL
28
rr
3
BHCS rel
Branch if Half-Carry Bit Set
PC ← (PC) + 2 + rel ? H = 1
— — — — —
REL
29
rr
3
BHI rel
Branch if Higher
PC ← (PC) + 2 + rel ? C ∨ Z = 0 — — — — —
REL
22
rr
3
BHS rel
Branch if Higher or Same
PC ← (PC) + 2 + rel ? C = 0
— — — — —
REL
24
rr
3
BIH rel
Branch if IRQ Pin High
PC ← (PC) + 2 + rel ? IRQ = 1
— — — — —
REL
2F
rr
3
BIL rel
Branch if IRQ Pin Low
PC ← (PC) + 2 + rel ? IRQ = 0
— — — — —
REL
2E
rr
3
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
109
Instruction Set
H I N Z C
BIT #opr
BIT opr
BIT opr
BIT opr,X
BIT opr,X
BIT ,X
Bit Test Accumulator with Memory Byte
BLO rel
Branch if Lower (Same as BCS)
BLS rel
Branch if Lower or Same
IMM
DIR
EXT
IX2
IX1
IX
2
A5 ii
B5 dd 3
C5 hh ll 4
D5 ee ff 5
4
E5 ff
3
F5
Cycles
Description
Opcode
Operation
Effect
on CCR
Address
Mode
Source
Form
Operand
Table 11-6. Instruction Set Summary (Sheet 2 of 6)
(A) ∧ (M)
— — —
PC ← (PC) + 2 + rel ? C = 1
— — — — —
REL
25
rr
3
PC ← (PC) + 2 + rel ? C ∨ Z = 1 — — — — —
REL
23
rr
3
BMC rel
Branch if Interrupt Mask Clear
PC ← (PC) + 2 + rel ? I = 0
— — — — —
REL
2C
rr
3
BMI rel
Branch if Minus
PC ← (PC) + 2 + rel ? N = 1
— — — — —
REL
2B
rr
3
BMS rel
Branch if Interrupt Mask Set
PC ← (PC) + 2 + rel ? I = 1
— — — — —
REL
2D
rr
3
BNE rel
Branch if Not Equal
PC ← (PC) + 2 + rel ? Z = 0
— — — — —
REL
26
rr
3
BPL rel
Branch if Plus
PC ← (PC) + 2 + rel ? N = 0
— — — — —
REL
2A
rr
3
BRA rel
Branch Always
PC ← (PC) + 2 + rel ? 1 = 1
— — — — —
REL
20
rr
3
01
03
05
07
09
0B
0D
0F
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
5
5
5
5
5
5
5
5
BRCLR n opr rel Branch if Bit n Clear
BRN rel
Branch Never
BRSET n opr rel Branch if Bit n Set
BSET n opr
Set Bit n
PC ← (PC) + 2 + rel ? Mn = 0
PC ← (PC) + 2 + rel ? 1 = 0
DIR (b0)
DIR (b1)
DIR (b2)
DIR (b3)
— — — — DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
— — — — —
21
rr
3
PC ← (PC) + 2 + rel ? Mn = 1
DIR (b0)
DIR (b1)
DIR (b2)
DIR (b3)
— — — — DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
REL
00
02
04
06
08
0A
0C
0E
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
dd rr
5
5
5
5
5
5
5
5
Mn ← 1
DIR (b0)
DIR (b1)
DIR (b2)
DIR (b3)
— — — — —
DIR (b4)
DIR (b5)
DIR (b6)
DIR (b7)
10
12
14
16
18
1A
1C
1E
dd
dd
dd
dd
dd
dd
dd
dd
5
5
5
5
5
5
5
5
PC ← (PC) + 2; push (PCL)
SP ← (SP) – 1; push (PCH)
SP ← (SP) – 1
PC ← (PC) + rel
— — — — —
REL
AD
rr
6
BSR rel
Branch to Subroutine
CLC
Clear Carry Bit
C←0
— — — — 0
INH
98
2
CLI
Clear Interrupt Mask
I←0
— 0 — — —
INH
9A
2
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
110
Freescale Semiconductor
Instruction Set Summary
CMP #opr
CMP opr
CMP opr
CMP opr,X
CMP opr,X
CMP ,X
COM opr
COMA
COMX
COM opr,X
COM ,X
CPX #opr
CPX opr
CPX opr
CPX opr,X
CPX opr,X
CPX ,X
DEC opr
DECA
DECX
DEC opr,X
DEC ,X
EOR #opr
EOR opr
EOR opr
EOR opr,X
EOR opr,X
EOR ,X
INC opr
INCA
INCX
INC opr,X
INC ,X
JMP opr
JMP opr
JMP opr,X
JMP opr,X
JMP ,X
JSR opr
JSR opr
JSR opr,X
JSR opr,X
JSR ,X
DIR
INH
INH
IX1
IX
3F
4F
5F
6F
7F
dd
— — IMM
DIR
EXT
IX2
IX1
IX
2
A1 ii
B1 dd 3
C1 hh ll 4
D1 ee ff 5
4
E1 ff
3
F1
— — 1
DIR
INH
INH
IX1
IX
33
43
53
63
73
— — IMM
DIR
EXT
IX2
IX1
IX
2
A3 ii
B3 dd 3
C3 hh ll 4
D3 ee ff 5
4
E3 ff
3
F3
— — —
DIR
INH
INH
IX1
IX
3A
4A
5A
6A
7A
— — —
IMM
DIR
EXT
IX2
IX1
IX
2
A8 ii
B8 dd 3
C8 hh ll 4
D8 ee ff 5
4
E8 ff
3
F8
— — —
DIR
INH
INH
IX1
IX
3C
4C
5C
6C
7C
— — — — —
DIR
EXT
IX2
IX1
IX
BC dd 2
CC hh ll 3
DC ee ff 4
EC ff
3
FC
2
— — — — —
DIR
EXT
IX2
IX1
IX
BD dd 5
CD hh ll 6
DD ee ff 7
6
ED ff
5
FD
Effect
on CCR
Description
H I N Z C
M ← $00
A ← $00
X ← $00
M ← $00
M ← $00
Clear Byte
Compare Accumulator with Memory Byte
Complement Byte (One’s Complement)
Compare Index Register with Memory Byte
M ← (M) = $FF – (M)
A ← (A) = $FF – (A)
X ← (X) = $FF – (X)
M ← (M) = $FF – (M)
M ← (M) = $FF – (M)
(X) – (M)
M ← (M) – 1
A ← (A) – 1
X ← (X) – 1
M ← (M) – 1
M ← (M) – 1
Decrement Byte
EXCLUSIVE OR Accumulator with Memory
Byte
Increment Byte
(A) – (M)
A ← (A) ⊕ (M)
M ← (M) + 1
A ← (A) + 1
X ← (X) + 1
M ← (M) + 1
M ← (M) + 1
Unconditional Jump
PC ← Jump Address
Jump to Subroutine
PC ← (PC) + n (n = 1, 2, or 3)
Push (PCL); SP ← (SP) – 1
Push (PCH); SP ← (SP) – 1
PC ← Effective Address
— — 0 1 —
ff
dd
ff
dd
ff
dd
ff
Cycles
Operand
CLR opr
CLRA
CLRX
CLR opr,X
CLR ,X
Operation
Opcode
Source
Form
Address
Mode
Table 11-6. Instruction Set Summary (Sheet 3 of 6)
5
3
3
6
5
5
3
3
6
5
5
3
3
6
5
5
3
3
6
5
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
111
Instruction Set
LDX #opr
LDX opr
LDX opr
LDX opr,X
LDX opr,X
LDX ,X
LSL opr
LSLA
LSLX
LSL opr,X
LSL ,X
A ← (M)
— — —
IMM
DIR
EXT
IX2
IX1
IX
2
AE ii
BE dd 3
CE hh ll 4
DE ee ff 5
4
EE ff
3
FE
X ← (M)
Load Index Register with Memory Byte
38
48
58
68
78
dd
— — DIR
INH
INH
IX1
IX
Logical Shift Left (Same as ASL)
C
0
b7
DIR
INH
INH
IX1
IX
34
44
54
64
74
dd
MUL
Unsigned Multiply
0 — — — 0
INH
42
— — DIR
INH
INH
IX1
IX
30
40
50
60
70
INH
9D
b0
0
C
b7
X : A ← (X) × (A)
NEG opr
NEGA
NEGX
NEG opr,X
NEG ,X
Negate Byte (Two’s Complement)
NOP
No Operation
— — 0 b0
M ← –(M) = $00 – (M)
A ← –(A) = $00 – (A)
X ← –(X) = $00 – (X)
M ← –(M) = $00 – (M)
M ← –(M) = $00 – (M)
— — — — —
A ← (A) ∨ (M)
Logical OR Accumulator with Memory
Rotate Byte Left through Carry Bit
C
b7
ROR opr
RORA
RORX
ROR opr,X
ROR ,X
Rotate Byte Right through Carry Bit
RSP
Reset Stack Pointer
dd
ff
— — —
39
49
59
69
79
dd
— — DIR
INH
INH
IX1
IX
DIR
INH
INH
IX1
IX
36
46
56
66
76
dd
INH
9C
— — — — —
5
3
3
6
5
5
3
3
6
5
2
AA
BA
CA
DA
EA
FA
— — 5
3
3
6
5
1
1
IMM
DIR
EXT
IX2
IX1
IX
b0
SP ← $00FF
ff
ii
dd
hh ll
ee ff
ff
b0
C
b7
ff
Cycles
2
A6 ii
B6 dd 3
C6 hh ll 4
D6 ee ff 5
4
E6 ff
3
F6
Description
Load Accumulator with Memory Byte
Logical Shift Right
ROL opr
ROLA
ROLX
ROL opr,X
ROL ,X
— — —
IMM
DIR
EXT
IX2
IX1
IX
Effect
on CCR
H I N Z C
LSR opr
LSRA
LSRX
LSR opr,X
LSR ,X
ORA #opr
ORA opr
ORA opr
ORA opr,X
ORA opr,X
ORA ,X
Opcode
LDA #opr
LDA opr
LDA opr
LDA opr,X
LDA opr,X
LDA ,X
Operation
Address
Mode
Source
Form
Operand
Table 11-6. Instruction Set Summary (Sheet 4 of 6)
ff
ff
2
3
4
5
4
3
5
3
3
6
5
5
3
3
6
5
2
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
112
Freescale Semiconductor
Instruction Set Summary
INH
80
9
— — — — —
INH
81
6
A ← (A) – (M) – (C)
— — IMM
DIR
EXT
IX2
IX1
IX
2
A2 ii
B2 dd 3
C2 hh ll 4
D2 ee ff 5
4
E2 ff
3
F2
Effect
on CCR
Description
RTI
Return from Interrupt
SP ← (SP) + 1; Pull (CCR)
SP ← (SP) + 1; Pull (A)
SP ← (SP) + 1; Pull (X)
SP ← (SP) + 1; Pull (PCH)
SP ← (SP) + 1; Pull (PCL)
RTS
Return from Subroutine
SP ← (SP) + 1; Pull (PCH)
SP ← (SP) + 1; Pull (PCL)
SBC #opr
SBC opr
SBC opr
SBC opr,X
SBC opr,X
SBC ,X
Subtract Memory Byte and Carry Bit from
Accumulator
SEC
Set Carry Bit
C←1
— — — — 1
INH
99
SEI
Set Interrupt Mask
I←1
— 1 — — —
INH
9B
STA opr
STA opr
STA opr,X
STA opr,X
STA ,X
Store Accumulator in Memory
STOP
Stop Oscillator and Enable IRQ Pin
STX opr
STX opr
STX opr,X
STX opr,X
STX ,X
SUB #opr
SUB opr
SUB opr
SUB opr,X
SUB opr,X
SUB ,X
Store Index Register In Memory
Subtract Memory Byte from Accumulator
SWI
Software Interrupt
TAX
Transfer Accumulator to Index Register
TST opr
TSTA
TSTX
TST opr,X
TST ,X
Test Memory Byte for Negative or Zero
M ← (A)
— — —
DIR
EXT
IX2
IX1
IX
B7
C7
D7
E7
F7
— 0 — — —
INH
8E
Cycles
H I N Z C
Opcode
Operation
Address
Mode
Source
Form
Operand
Table 11-6. Instruction Set Summary (Sheet 5 of 6)
2
2
dd
hh ll
ee ff
ff
4
5
6
5
4
2
dd
hh ll
ee ff
ff
4
5
6
5
4
— — —
DIR
EXT
IX2
IX1
IX
BF
CF
DF
EF
FF
— — IMM
DIR
EXT
IX2
IX1
IX
2
A0 ii
B0 dd 3
C0 hh ll 4
D0 ee ff 5
4
E0 ff
3
F0
PC ← (PC) + 1; Push (PCL)
SP ← (SP) – 1; Push (PCH)
SP ← (SP) – 1; Push (X)
SP ← (SP) – 1; Push (A)
— 1 — — —
SP ← (SP) – 1; Push (CCR)
SP ← (SP) – 1; I ← 1
PCH ← Interrupt Vector High Byte
PCL ← Interrupt Vector Low Byte
INH
83
1
0
— — — — —
INH
97
2
— — —
DIR
INH
INH
IX1
IX
3D
4D
5D
6D
7D
M ← (X)
A ← (A) – (M)
X ← (A)
(M) – $00
dd
ff
4
3
3
5
4
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
113
Instruction Set
WAIT
A
C
CCR
dd
dd rr
DIR
ee ff
EXT
ff
H
hh ll
I
ii
IMM
INH
IX
IX1
IX2
M
N
n
— — — — —
INH
9F
2
— 0 — — —
INH
8F
2
Effect
on CCR
Description
Transfer Index Register to Accumulator
A ← (X)
Stop CPU Clock and Enable Interrupts
Accumulator
Carry/borrow flag
Condition code register
Direct address of operand
Direct address of operand and relative offset of branch instruction
Direct addressing mode
High and low bytes of offset in indexed, 16-bit offset addressing
Extended addressing mode
Offset byte in indexed, 8-bit offset addressing
Half-carry flag
High and low bytes of operand address in extended addressing
Interrupt mask
Immediate operand byte
Immediate addressing mode
Inherent addressing mode
Indexed, no offset addressing mode
Indexed, 8-bit offset addressing mode
Indexed, 16-bit offset addressing mode
Memory location
Negative flag
Any bit
opr
PC
PCH
PCL
REL
rel
rr
SP
X
Z
#
∧
∨
⊕
()
–( )
←
?
:
—
Cycles
H I N Z C
Opcode
TXA
Operation
Address
Mode
Source
Form
Operand
Table 11-6. Instruction Set Summary (Sheet 6 of 6)
Operand (one or two bytes)
Program counter
Program counter high byte
Program counter low byte
Relative addressing mode
Relative program counter offset byte
Relative program counter offset byte
Stack pointer
Index register
Zero flag
Immediate value
Logical AND
Logical OR
Logical EXCLUSIVE OR
Contents of
Negation (two’s complement)
Loaded with
If
Concatenated with
Set or cleared
Not affected
11.5 Opcode Map
See Table 11-7.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
114
Freescale Semiconductor
Freescale Semiconductor
Table 11-7. Opcode Map
Bit Manipulation
DIR
DIR
MSB
LSB
0
1
2
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
3
4
5
6
7
8
9
A
B
C
D
E
F
0
1
Branch
REL
DIR
2
3
Read-Modify-Write
INH
INH
IX1
4
5
6
IX
7
5
5
3
5
3
3
6
5
BRSET0
BSET0
BRA
NEG
NEGA
NEGX
NEG
NEG
3
DIR 2
DIR 2
REL 2
DIR 1
INH 1
INH 2
IX1 1
IX 1
5
5
3
BRCLR0
BCLR0
BRN
3
DIR 2
DIR 2
REL
1
5
5
3
11
BRSET1
BSET1
BHI
MUL
3
DIR 2
DIR 2
REL
1
INH
5
5
3
5
3
3
6
5
BRCLR1
BCLR1
BLS
COM
COMA
COMX
COM
COM
3
DIR 2
DIR 2
REL 2
DIR 1
INH 1
INH 2
IX1 1
IX 1
5
5
3
5
3
3
6
5
BRSET2
BSET2
BCC
LSR
LSRA
LSRX
LSR
LSR
3
DIR 2
DIR 2
REL 2
DIR 1
INH 1
INH 2
IX1 1
IX
5
5
3
BRCLR2
BCLR2 BCS/BLO
3
DIR 2
DIR 2
REL
5
5
3
5
3
3
6
5
BRSET3
BSET3
BNE
ROR
RORA
RORX
ROR
ROR
3
DIR 2
DIR 2
REL 2
DIR 1
INH 1
INH 2
IX1 1
IX
5
5
3
5
3
3
6
5
BRCLR3
BCLR3
BEQ
ASR
ASRA
ASRX
ASR
ASR
3
DIR 2
DIR 2
REL 2
DIR 1
INH 1
INH 2
IX1 1
IX
5
5
3
5
3
3
6
5
BRSET4
BSET4
BHCC
ASL/LSL ASLA/LSLA ASLX/LSLX ASL/LSL ASL/LSL
3
DIR 2
DIR 2
REL 2
DIR 1
INH 1
INH 2
IX1 1
IX
5
5
3
5
3
3
6
5
BRCLR4
BCLR4
BHCS
ROL
ROLA
ROLX
ROL
ROL
3
DIR 2
DIR 2
REL 2
DIR 1
INH 1
INH 2
IX1 1
IX
5
5
3
5
3
3
6
5
BRSET5
BSET5
BPL
DEC
DECA
DECX
DEC
DEC
3
DIR 2
DIR 2
REL 2
DIR 1
INH 1
INH 2
IX1 1
IX
5
5
3
BRCLR5
BCLR5
BMI
3
DIR 2
DIR 2
REL
5
5
3
5
3
3
6
5
BRSET6
BSET6
BMC
INC
INCA
INCX
INC
INC
3
DIR 2
DIR 2
REL 2
DIR 1
INH 1
INH 2
IX1 1
IX
5
5
3
4
3
3
5
4
BRCLR6
BCLR6
BMS
TST
TSTA
TSTX
TST
TST
3
DIR 2
DIR 2
REL 2
DIR 1
INH 1
INH 2
IX1 1
IX
5
5
3
BRSET7
BSET7
BIL
3
DIR 2
DIR 2
REL
1
5
5
3
5
3
3
6
5
BRCLR7
BCLR7
BIH
CLR
CLRA
CLRX
CLR
CLR
3
DIR 2
DIR 2
REL 2
DIR 1
INH 1
INH 2
IX1 1
IX 1
REL = Relative
IX = Indexed, No Offset
IX1 = Indexed, 8-Bit Offset
IX2 = Indexed, 16-Bit Offset
8
9
9
RTI
INH
6
RTS
INH
2
2
2
10
SWI
INH
2
2
2
2
1
1
1
1
1
1
1
2
TAX
INH
2
CLC
INH 2
2
SEC
INH 2
2
CLI
INH 2
2
SEI
INH 2
2
RSP
INH
2
NOP
INH 2
2
STOP
INH
2
2
WAIT
TXA
INH 1
INH
IMM
DIR
A
B
2
SUB
IMM 2
2
CMP
IMM 2
2
SBC
IMM 2
2
CPX
IMM 2
2
AND
IMM 2
2
BIT
IMM 2
2
LDA
IMM 2
2
2
EOR
IMM 2
2
ADC
IMM 2
2
ORA
IMM 2
2
ADD
IMM 2
2
6
BSR
REL 2
2
LDX
2
IMM 2
2
MSB
LSB
LSB of Opcode in Hexadecimal
0
Register/Memory
EXT
IX2
3
SUB
DIR 3
3
CMP
DIR 3
3
SBC
DIR 3
3
CPX
DIR 3
3
AND
DIR 3
3
BIT
DIR 3
3
LDA
DIR 3
4
STA
DIR 3
3
EOR
DIR 3
3
ADC
DIR 3
3
ORA
DIR 3
3
ADD
DIR 3
2
JMP
DIR 3
5
JSR
DIR 3
3
LDX
DIR 3
4
STX
DIR 3
0
C
4
SUB
EXT 3
4
CMP
EXT 3
4
SBC
EXT 3
4
CPX
EXT 3
4
AND
EXT 3
4
BIT
EXT 3
4
LDA
EXT 3
5
STA
EXT 3
4
EOR
EXT 3
4
ADC
EXT 3
4
ORA
EXT 3
4
ADD
EXT 3
3
JMP
EXT 3
6
JSR
EXT 3
4
LDX
EXT 3
5
STX
EXT 3
D
5
SUB
IX2 2
5
CMP
IX2 2
5
SBC
IX2 2
5
CPX
IX2 2
5
AND
IX2 2
5
BIT
IX2 2
5
LDA
IX2 2
6
STA
IX2 2
5
EOR
IX2 2
5
ADC
IX2 2
5
ORA
IX2 2
5
ADD
IX2 2
4
JMP
IX2 2
7
JSR
IX2 2
5
LDX
IX2 2
6
STX
IX2 2
IX1
IX
E
F
4
SUB
IX1 1
4
CMP
IX1 1
4
SBC
IX1 1
4
CPX
IX1 1
4
AND
IX1 1
4
BIT
IX1 1
4
LDA
IX1 1
5
STA
IX1 1
4
EOR
IX1 1
4
ADC
IX1 1
4
ORA
IX1 1
4
ADD
IX1 1
3
JMP
IX1 1
6
JSR
IX1 1
4
LDX
IX1 1
5
STX
IX1 1
MSB
LSB
3
SUB
1
CMP
IX
3
SBC
IX
3
CPX
2
3
IX
3
4
AND
IX
3
BIT
5
IX
3
6
LDA
IX
4
7
STA
IX
3
EOR
8
IX
3
9
ADC
IX
3
A
ORA
IX
3
ADD
B
IX
2
C
JMP
IX
5
JSR
IX
3
LDX
D
E
IX
4
F
STX
IX
MSB of Opcode in Hexadecimal
5 Number of Cycles
BRSET0 Opcode Mnemonic
3
DIR Number of Bytes/Addressing Mode
0
IX
3
115
Opcode Map
INH = Inherent
IMM = Immediate
DIR = Direct
EXT = Extended
Control
INH
INH
Instruction Set
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
116
Freescale Semiconductor
Chapter 12
Electrical Specifications
12.1 Introduction
This section contains parametric and timing information.
12.2 Maximum Ratings
Maximum ratings are the extreme limits to which the microcontroller unit (MCU) can be exposed without
permanently damaging it.
The MCU contains circuitry to protect the inputs against damage from high static voltages; however, do
not apply voltages higher than those shown in this table. Keep VIn and VOut within the range
VSS ≤ (VIn or VOut) ≤ VDD. Connect unused inputs to the appropriate voltage level, either VSS or VDD.
Rating
Symbol
Value
Unit
VDD
VLCD1
VLCD2
VLCD3
–0.3 to +7.0
VSS –0.3 to VDD +0.3
VSS –0.3 to VDD +0.3
VSS –0.3 to VDD +0.3
V
Input voltage
VIn
VSS –0.3 to VDD + 0.3
V
Self-check mode
(IRQ1 pin only)
VIn
VSS –0.3 to
2 x VDD + 0.3
V
Output voltage
VOut
VSS –0.3 to VDD + 0.3
V
I
12.5
mA
TJ
+150
°C
Tstg
–55 to +150
°C
Supply voltage
Current drain per pin
excluding VDD and VSS
Operating junction temperature
Storage temperature range
NOTE
This device is not guaranteed to operate properly at the maximum ratings.
Refer to 12.6 5.0-Volt DC Electrical Characteristics and
12.7 3.3-Volt DC Electrical Characteristics for guaranteed operating
conditions.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
117
Electrical Specifications
12.3 Operating Temperature Range
Characteristic
Operating temperature range
MC68HC05L16 (standard)
MC68HC05L16C (extended)
Symbol
Value
Unit
TA
TL to TH
0 to +70
–40 to +85
°C
Symbol
Value
Unit
θJA
120
°C/W
12.4 Thermal Characteristics
Characteristic
Thermal resistance
80-pin plastic quad flat pack
12.5 Recommended Operating Conditions
Rating(1)
Supply voltage
Symbol
Min
Typ
Max
Unit
(fOP = 2.1 MHz)
VDD
4.5
5.0
5.5
V
(fOP = 1.0 MHz)
VDD
2.2
—
5.5
V
VLCD1
VDD – 1/3 VLCD
V
VLCD2
VDD – 2/3 VLCD
V
VLCD3
VDD – 3/3 VLCD
V
fOSC
—
3.52
4.2
MHz
C1
C2
—
—
33
33
—
—
pF
Slow clock oscillation frequency
fXOSC
—
32.768
—
MHz
External capacitance
(fXOSC = 32.768 kHz)
CX1
CX2
—
—
18
22
—
—
pF
Fast clock oscillation frequency
External capacitance
(fOSC = 3.52 MHz)
1. +2.2 ≤ VDD ≤ +5.5 Vdc, VSS = 0 Vdc, TL ≤ TA ≤ TH, unless otherwise noted
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
118
Freescale Semiconductor
5.0-Volt DC Electrical Characteristics
12.6 5.0-Volt DC Electrical Characteristics
Characteristic(1)
Symbol
Min
Typ
Max
Unit
VOL
VOH
—
VDD –0.1
—
—
0.1
—
V
Output high voltage (VDD = 5.0 V)
(ILoad = –0.4 mA) PA0–PA7, PC0–PC5, PD1–PD7,
PE0–PE7
VOH
VDD –0.8
—
—
V
Output low voltage (VDD = 5.0 V)
(ILoad = 0.8 mA) PA0–PA7, PC0–PC7, PD1–PD7, PE0–PE7
VOL
—
—
0.4
V
Input high voltage
PA0–PA7, PB0–PB7, PC0–PC7, RESET, OSC1, XOSC1
VIH
0.7 x VDD
—
VDD
V
Input low voltage
PA0–PA7, PB0–PB7, PC0–PC7, RESET, OSC1, XOSC1
VIL
VSS
—
0.3 x VDD
V
—
—
6.0
3.0
12.0
6.0
mA
mA
—
—
3.0
17.0
10.0
—
µA
µA
—
—
± 1.0
µA
50
50
200
30
180
180
700
125
400
400
1400
300
µA
µA
µA
µA
—
—
10
5
20
18
kΩ
kΩ
Output voltage
ILoad = 10.0 µA
ILoad = –10.0 µA
Supply current(2), (3), (4), (5)
Run (fop = 2.1 MHz)
Wait (fop = 2.1 MHz)
Stop
No clock
XOSC = 32.768 kHz, VDD = 5.0 V, TA = +25 oC
IDD
Input current(6) (with pullups disabled)
PA0–PA7, PB0–PB7, PC0–PC7, RESET, OSC1, XOSC1
IIn
Input current(6) (with pullups enabled, VDD = 5.0 V)
PA0–PA7
PB0–PB7
PC0–PC5
PC6–PC7
IIn
LCD pin output impedance
FP0–FP26
BP0–BP3
Zo, FP
Zo, BP
1. +4.5 ≤ VDD ≤ +5.5 Vdc, VSS = 0 Vdc, TL ≤ TA ≤ TH, unless otherwise noted. All values shown reflect average measurements. Typical values at midpoint of voltage range, 25 °C only.
2. Run (Operating) IDD, wait IDD; measured using external square wave clock source (fOSC = 4.2 MHz); all inputs 0.2 V from
rail (VSS or VDD); no dc loads; less than 50 pF on all outputs; CL = 20 pF on OSC2
3. Wait, stop IDD; all ports configured as inputs; VIL = 0.2 V; VIH = VDD –0.2 V
4. Stop IDD measured with OSC1 = VSS.
5. Wait IDD is affected linearly by the OSC2 capacitance.
6. Input current is measured with output transistor turned off and VIn = 0 V.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
119
Electrical Specifications
12.7 3.3-Volt DC Electrical Characteristics
Characteristic(1)
Symbol
Min
Typ
Max
Unit
VOL
VOH
—
VDD –0.1
—
—
0.1
—
V
Output high voltage (VDD = 3.5 V)
(ILoad = –0.4 mA) PA0–PA7, PC0–PC5, PD1–PD7, PE0–PE7
VOH
VDD –0.8
—
—
V
Output low voltage (VDD = 3.5 V)
(ILoad = 0.8 mA) PA0–PA7, PC0–PC7, PD1–PD7, PE0–PE7
VOL
—
—
0.4
V
Input high voltage
PA0–PA7, PB0–PB7, PC0–PC7, RESET,OSC1, XOSC1
VIH
0.7 x VDD
—
VDD
V
Input low voltage
PA0–PA7, PB0–PB7, PC0–PC7, RESET, OSC1, XOSC1
VIL
VSS
—
0.3 x VDD
V
—
—
1.8
0.8
4.0
2.0
mA
mA
—
—
2.0
8.0
10.0
—
µA
µA
—
—
± 1.0
µA
20
20
50
30
75
75
300
100
300
300
1000
250
µA
µA
µA
µA
—
—
10
5
20
18
kΩ
kΩ
Output voltage
ILoad = 10.0 µA
ILoad = –10.0 µA
Supply current(2), (3), (4), (5)
Run (fop = 1.0 MHz)
Wait (fop = 1.0 MHz)
Stop
No clock
XOSC = 32.768 kHz, VDD = 3.0 V, TA= +25 oC
IDD
Input current(6) (with pullups disabled)
PA0–PA7, PB0–PB7, PC0–PC7, RESET, OSC1, XOSC1
IIn
Input current(6) (with pullups enabled, VDD = 3.3 V)
PA0–PA7
PB0–PB7
PC0–PC5
PC6–PC7
IIn
LCD pin output impedance
FP0–FP26
BP0–BP3
Zo, FP
Zo, BP
1. +3.0 ≤ VDD < +4.5 Vdc, VSS = 0 Vdc, TL ≤ TA ≤ TH, unless otherwise noted. All values shown reflect average measurements.
Typical values at midpoint of voltage range, 25 °C only.
2. Run (Operating) IDD, wait IDD; measured using external square wave clock source (fOSC = 2.0 MHz); all inputs 0.2 V from
rail (VSS or VDD); no dc loads; less than 50 pF on all outputs; CL = 20 pF on OSC2
3. Wait, stop IDD; all ports configured as inputs; VIL = 0.2 V; VIH = VDD –0.2 V
4. Stop IDD measured with OSC1 = VSS.
5. Wait IDD is affected linearly by the OSC2 capacitance.
6. Input current is measured with output transistor turned off and VIn = 0 V.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
120
Freescale Semiconductor
2.7-Volt DC Electrical Characteristics
12.8 2.7-Volt DC Electrical Characteristics
Characteristic(1)
Symbol
Min
Typ
Max
Unit
VOL
VOH
—
VDD –0.1
—
—
0.1
—
V
Output high voltage (VDD = 2.2 V)
(ILoad = –0.4 mA) PA0–PA7, PC0–PC5, PD1–PD7, PE0–PE7
VOH
VDD –0.6
—
—
V
Output low voltage (VDD = 2.2 V)
(ILoad = 0.4 mA) PA0–PA7, PC0–PC7, PD1–PD7, PE0–PE7
VOL
—
—
0.3
V
Input high voltage
PA0–PA7, PB0–PB7, PC0–PC7, RESET, OSC1, XOSC1
VIH
0.7 x VDD
—
VDD
V
Input low voltage
PA0–PA7, PB0–PB7, PC0–PC7, RESET, OSC1, XOSC1
VIL
VSS
—
0.3 x VDD
V
—
—
0.7
0.4
2.2
1.4
mA
mA
—
—
1.5
5.0
10.0
—
µA
µA
—
—
± 1.0
µA
5
5
30
20
50
50
200
85
150
150
600
200
µA
µA
µA
µA
—
—
10
5
20
18
kΩ
kΩ
Output voltage
ILoad = 10.0 µA
ILoad = –10.0 µA
Supply current(2), (3), (4), (5)
Run (fop = 1.0 MHz)
Wait (fop = 1.0 MHz)
Stop
No clock
XOSC = 32.768 kHz, VDD = 2.2 V, TA= +25 oC
IDD
Input current(6) (with pullups disabled)
PA0–PA7, PB0–PB7, PC0–PC7, RESET, OSC1, XOSC1
IIn
Input current(6) (with pullups enabled, VDD = 2.7 V)
PA0–PA7
PB0–PB7
PC0–PC5
PC6–PC7
IIn
LCD pin output impedance
FP0–FP26
BP0–BP3
Zo, FP
Zo, BP
1. +2.2 ≤ VDD < +3.0 Vdc, VSS = 0 Vdc, TL ≤ TA ≤ TH, unless otherwise noted. All values shown reflect average measurements.
Typical values at midpoint of voltage range, 25 °C only.
2. Run (Operating) IDD, wait IDD; measured using external square wave clock source (fOSC = 2.0 MHz); all inputs 0.2 V from
rail (VSS or VDD); no dc loads; less than 50 pF on all outputs; CL = 20 pF on OSC2
3. Wait, stop IDD; all ports configured as inputs; VIL = 0.2 V; VIH = VDD –0.2 V
4. Stop IDD measured with OSC1 = VSS.
5. Wait IDD is affected linearly by the OSC2 capacitance.
6. Input current is measured with output transistor turned off and VIn = 0 V.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
121
Electrical Specifications
12.9 Control Timing
Characteristic(1)
Symbol
Min
Max
Unit
Frequency of oscillation (OSC)
Crystal
External clock
fosc
—
dc
4.2
4.2
MHz
Internal operating frequency(2), crystal or external
clock (fOSC/2)
VDD = 4.5 V to 5.5 V
VDD = 2.2 V to 5.5 V
fop
—
—
2.1
1.0
MHz
Cycle time (fast OSC selected)
VDD = 4.5 V to 5.5 V
VDD = 2.2 V to 5.5 V
tcyc
480
1.0
—
—
ns
µs
RESET pulse width when bus clock active
tRL
1.5
—
tcyc
tRESL
tTH, tTL
4.0
284
—
—
tcyc
ns
Interrupt pulse width low (edge-triggered)
tILIH
284
—
ns
Interrupt pulse period(3)
tILIL
see note
—
tcyc
tOH, tOL
110
—
ns
Timer
Resolution
Input capture (TCAP) pulse width
OSC1 pulse width (external clock input)
1. +2.2 ≤ VDD ≤ +5.5 Vdc, VSS = 0 Vdc, TL ≤ TA ≤ TH, unless otherwise noted.
2. The system clock divider configuration (SYS1–SYS0 bits) should be selected such that the internal operating frequency
(fOP) does not exceed value specified in fOP for a given fOSC.
3. The minimum period, tILIL, should not be less than the number of cycle times it takes to execute the interrupt service routine
plus 21 tcyc.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
122
Freescale Semiconductor
Control Timing
OSC1
1
t
RL
RESET
t
IRQ
ILIH
2
t
ILCH
8092 t
cyc
IRQ3
INTERNAL
CLOCK
INTERNAL
ADDRESS
BUS
FFFE
FFFE
FFFE
Notes:
1. Represents the internal gating of the OSC1 pin
2. IRQ pin edge-sensitive mask option
3. IRQ pin level and edge-sensitive mask option
4. RESET vector address shown for timing example
FFFE
FFFF4
RESET OR INTERRUPT
VECTOR FETCH
Figure 12-1. Stop Recovery Timing Diagram
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
123
Electrical Specifications
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
124
Freescale Semiconductor
Chapter 13
Mechanical Specifications
13.1 Introduction
This section describes the dimensions of the quad flat pack (QFP).
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
125
Mechanical Specifications
13.2 Quad Flat Pack (QFP) — Case 841B-01
L
41
60
61
S
S
D
S
-A,B,DDETAIL A
21
80
1
F
20
-DA
0.20 (0.008) M C A-B
0.05 (0.002) A-B
0.20 (0.008)
M
S
H A-B
S
D
S
S
D
S
N
J
D
M
E
DETAIL C
C
-H-
0.20 (0.008)
DATUM
PLANE
M
C A-B
S
D
S
SECTION B-B
0.01 (0.004)
-CSEATING
PLANE
H A-B
DETAIL A
V
P
B
M
B
B
0.20 (0.008)
L
S
-B-
0.20 (0.008) M C A-B
0.05 (0.002) A-B
-A-
D
40
H
M
G
U
T
DATUM
PLANE
-H-
R
K
W
X
DETAIL C
Q
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DATUM PLANE ĆHĆ IS LOCATED AT BOTTOM OF
LEAD AND IS COINCIDENT WITH THE LEAD WHERE
THE LEAD EXITS THE PLASTIC BODY AT THE
BOTTOM OF THE PARTING LINE.
4. DATUMS ĆAĆ, ĆBĆ AND ĆDĆ TO BE DETERMINED AT
DATUM PLANE ĆHĆ.
5. DIMENSIONS S AND V TO BE DETERMINED AT
SEATING PLANE ĆCĆ.
6. DIMENSIONS A AND B DO NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE PROTRUSION IS 0.25
(0.010) PER SIDE. DIMENSIONS A AND B DO
INCLUDE MOLD MISMATCH AND ARE DETERMINED
AT DATUM PLANE ĆHĆ.
7. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR PROTRUSION
SHALL BE 0.08 (0.003) TOTAL IN EXCESS OF THE D
DIMENSION AT MAXIMUM MATERIAL CONDITION.
DAMBAR CANNOT BE LOCATED ON THE LOWER
RADIUS OR THE FOOT.
DIM
A
B
C
D
E
F
G
H
J
K
L
M
N
P
Q
R
S
T
U
V
W
X
MILLIMETERS
MIN
MAX
14.10
13.90
14.10
13.90
2.45
2.15
0.38
0.22
2.40
2.00
0.33
0.22
0.65 BSC
0.25
Ċ
0.23
0.13
0.95
0.65
12.35 BSC
10°
5° Ă
0.17
0.13
0.325 BSC
7°Ă
0° Ă
0.30
0.13
17.45
16.95
Ċ
0.13
Ċ
0°Ă
17.45
16.95
0.45
0.35
1.6 REF
INCHES
MIN
MAX
0.547 0.555
0.547 0.555
0.084 0.096
0.009 0.015
0.079 0.094
0.009 0.013
0.026 BSC
0.010
Ċ Ă
0.005 0.009
0.026 0.037
0.486 BSC
10°
5° Ă
0.005 0.007
0.013 BSC
7° Ă
0° Ă
0.005 0.012
0.667 0.687
Ċ Ă
0.005
Ċ Ă
0° Ă
0.667 0.687
0.014 0.018
0.06 REF
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
126
Freescale Semiconductor
Chapter 14
Ordering Information
14.1 Introduction
This section contains instructions for ordering custom-masked ROM MCUs.
14.2 MCU Ordering Forms
To initiate an order for a ROM-based MCU, first obtain the current ordering form for the MCU from a
Freescale representative. Submit the following items when ordering MCUs:
• A current MCU ordering form that is completely filled out (Contact your Freescale sales office for
assistance.)
• A copy of the customer specification if the customer specification deviates from the Freescale
specification for the MCU
• Customer’s application program on one of the media listed in 14.3 Application Program Media
14.3 Application Program Media
Please deliver the application program to Freescale in one of the following media:
• Macintosh®(1) 3 1/2-inch diskette (double-sided 800 K or double-sided high-density 1.4 M)
• MS-DOS®(2) or PC-DOSTM(3) 3 1/2-inch diskette (double-sided
720 K or double-sided high-density 1.44 M)
• MS-DOS® or PC-DOSTM 5 1/4-inch diskette (double-sided double-density 360 K or double-sided
high-density 1.2 M)
Use positive logic for data and addresses.
When submitting the application program on a diskette, clearly label the diskette with the following
information:
• Customer name
• Customer part number
• Project or product name
• File name of object code
• Date
• Name of operating system that formatted diskette
• Formatted capacity of diskette
1. Macintosh is a registered trademark of Apple Computer, Inc.
2. MS-DOS is a registered trademark of Microsoft Corporation.
3. PC-DOS is a trademark of International Business Machines Corporation.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
127
Ordering Information
On diskettes, the application program must be in Freescale’s S-record format (S1 and S9 records), a
character-based object file format generated by M6805 cross assemblers and linkers.
NOTE
Begin the application program at the first user ROM location. Program
addresses must correspond exactly to the available on-chip user ROM
addresses as shown in the memory map. Write $00 in all non-user ROM
locations or leave all non-user ROM locations blank. Refer to the current
MCU ordering form for additional requirements. Freescale may request
pattern re-submission if non-user areas contain any non-zero code.
If the memory map has two user ROM areas with the same addresses, then write the two areas in
separate files on the diskette. Label the diskette with both filenames.
In addition to the object code, a file containing the source code can be included. Freescale keeps this
code confidential and uses it only to expedite ROM pattern generation in case of any difficulty with the
object code. Label the diskette with the filename of the source code.
14.4 ROM Program Verification
The primary use for the on-chip ROM is to hold the customer’s application program. The customer
develops and debugs the application program and then submits the MCU order along with the application
program.
Freescale inputs the customer’s application program code into a computer program that generates a
listing verify file. The listing verify file represents the memory map of the MCU. The listing verify file
contains the user ROM code and may also contain non-user ROM code, such as self-check code.
Freescale sends the customer a computer printout of the listing verify file along with a listing verify form.
To aid the customer in checking the listing verify file, Freescale will program the listing verify file into
customer-supplied blank preformatted Macintosh or DOS disks. All original pattern media are filed for
contractual purposes and are not returned.
Check the listing verify file thoroughly, then complete and sign the listing verify form and return the listing
verify form to Freescale. The signed listing verify form constitutes the contractual agreement for the
creation of the custom mask.
14.5 ROM Verification Units (RVUs)
After receiving the signed listing verify form, Freescale manufactures a custom photographic mask. The
mask contains the customer’s application program and is used to process silicon wafers. The application
program cannot be changed after the manufacture of the mask begins. Freescale then produces 10
MCUs, called RVUs, and sends the RVUs to the customer. RVUs are usually packaged in unmarked
ceramic and tested to 5 Vdc at room temperature. RVUs are not tested to environmental extremes
because their sole purpose is to demonstrate that the customer’s user ROM pattern was properly
implemented. The 10 RVUs are free of charge with the minimum order quantity. These units are not to be
used for qualification or production. RVUs are not guaranteed by Freescale Quality Assurance.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
128
Freescale Semiconductor
MC Order Numbers
14.6 MC Order Numbers
Table 14-1 shows the MC order numbers for the available package types.
Table 14-1. MC Order Numbers
Package Type
80-pin plastic quad flat pack (QFP)
Operating
Temperature Range
MC Order Number
0°C to +70°C
MC68HC05L16FU
–40°C to +85°C
MC68HC05L16CFU
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
129
Ordering Information
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
130
Freescale Semiconductor
Appendix A
MC68HC705L16
A.1 Introduction
The MC68HC705L16 is similar to the MC68HC05L16 with the exception of the EPROM feature. The
program ROM on the MC68HC05L16 has been replaced by 16-K electrically programmable read-only
memory to allow modification of the program code for emulation. The entire data sheet of the
MC68HC05L16 applies to the EPROM part with the additions and exceptions explained in this appendix.
The additional features available on the MC68HC705L16 are:
• 16,384 bytes of EPROM
• On-chip bootstrap firmware for programming use
• Self-check mode replaced by bootstrap capability
A.2 Differences between MC68HC05L16 and MC68HC705L16
Table A-1. Differences Between MC68HC05L16 and MC68HC705L16
Item
MC68HC05L16
MC68HC705L16
ROM memory type
Mask ROM
EPROM
Internal test mode
Self-check mode
Bootstrap mode
LCD 1/2 duty 1/2 bias waveform
See Figure 10-2
See Figure A-6
Not applicable
Through VPP pin
and PCR
Customer specified
No mask option
Available by mask option
Not available
EPROM programming
Mask option
OSC, XOSC, and RESET pin
resistor option
A.3 MCU Structure
Figure A-1 shows the structure of the MC68HC705L16 MCU.
A.4 Mask Options
There are no mask options available for the MC68HC705L16. For this reason, the address option map
shown in Chapter 2 Memory Map has no meaning.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
131
MC68HC705L16
XOSC1
XOSC2
÷2
XOSC
INTERNAL
PROCESSOR
CLOCK
PORT A
DIV
SEL
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PORT B
OSC
DATA A
DIR REG
OSC1
OSC2
PB0/KWI0
PB1/KWI1
PB2/KWI2
PB3/KWI3
PB4/KWI4
PB5/KWI5
PB6/KWI6
PB7/KWI7
SRAM
512 BYTES
DATA B
DIR REG
KEY WAKEUP
TIMEBASE
SYSTEM
BOOTSTRAP ROM
RESET
CPU
CONTROL
PORT C
EPROM
16,384 BYTES
+ 16 BYTES
DATA C
DIR REG
TIMER2
COP
SYSTEM
PC0/SDI
PC1/SDO
PC2/SCK
PC3/TCAP
PC4/EVI
PC5/EVO
PC6*/IRQ2
PC7*/IRQ1
SPI
496 BYTES
ALU
M68HC05 CPU
CPU REGISTERS
DD
LCD
DRIVERS
INDEX REGISTER
SS
STACK POINTER
V
PP
**
FP0–PF26
PROGRAM COUNTER
PORT E
V
ACCUMULATOR
FP27/PE7
FP28/PE6
FP29/PE5
FP30/PE4
FP31/PE3
FP32/PE2
FP33/PE1
FP34/PE0
PORT D
V
FP35/PD7
FP36/PD6
FP37/PD5
FP38/PD4
BP3/PD3
BP2/PD2
BP1/PD1
BP0
CONDITION CODE REG
VLCD3
VLCD2
VLCD1
* Open drain only when output
** The VPP pin should be connected to VDD in single-chip
Figure A-1. Block Diagram
NOTE
A line over a signal name indicates an active low signal. For example,
RESET is active low.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
132
Freescale Semiconductor
Functional Pin Description
A.5 Functional Pin Description
FP27/PE7
FP26
FP25
FP24
FP23
FP22
FP21
FP20
FP19
FP18
FP17
FP16
FP15
FP14
FP13
FP12
FP11
FP10
FP9
FP8
The MC68HC705L16 is available in the 80-pin quad flat pack (QFP). The pin assignment is shown in
Figure A-2.
80
61
1
20
60
21
40 41
VSS
FP7
FP6
FP5
FP4
FP3
FP2
FP1
FP0
BP0
BP1/PD1
BP2/PD2
BP3/PD3
VDD
PC7*/IRQ1
PC6*/IRQ2
PC5/EVO
PC4/EVI
PC3/TCAP
PC2/SCK
OSC1
OSC2
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PB0/KWI0
PB1/KWI1
PB2/KWI2
PB3/KWI3
PB4/KWI4
PB5/KWI5
PB6/KWI6
PB7/KWI7
PC0/SDI
PC1/SDO
VDD
FP28/PE6
FP29/PE5
FP30/PE4
FP31/PE3
FP32/PE2
FP33/PE1
FP34/PE0
FP35/PD7
FP36/PD6
FP37/PD5
FP38/PD4
VLCD3
VLCD2
VLCD1
VSS
VPP**
XOSC1
XOSC2
RESET
* Open drain only when output
**The VPP pin should be connect to VDD in single-chip mode.
Figure A-2. Pin Assignments for Single-Chip Mode
A.6 Programming Voltage (VPP)
In single-chip (user) mode, the VPP pin should be tied to VDD level.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
133
MC68HC705L16
Table A-2. Pin Configuration
Pin
Number
SCM,
Bootstrap
I/O
Pin
Number
SCM,
Bootstrap
I/O
23
24
25
26
27
28
29
30
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
52
53
54
55
56
57
58
59
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
FP0
FP1
FP2
FP3
FP4
FP5
FP6
FP7
FP8
FP9
FP10
FP11
FP12
FP13
FP14
FP15
FP16
FP17
FP18
FP19
FP20
FP21
FP22
FP23
FP24
FP25
FP26
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
31
32
33
34
35
36
37
38
PB0/KWI0
PB1/KWI1
PB2/KWI2
PB3/KWI3
PB4/KWI4
PB5/KWI5
PB6/KWI6
PB7/KWI7
I
I
I
I
I
I
I
I
39
40
41
42
43
44
45
46
PC0/SDI
PC1/SDO
PC2/SCK
PC3/TCAP
PC4/EVI
PC5/EVO
PC6*/IRQ2
PC7*/IRQ1
I/O
I/O
I/O
I/O
I/O
I/O
I
I
17
VPP**
I
47
1
60
16
21
22
18
19
VDD
VDD
VSS
VSS
OSC1
OSC2
XOSC1
XOSC2
I
I
O
O
I
O
I
O
80
2
3
4
5
6
7
8
FP27/PE7
FP28/PE6
FP29/PE5
FP30/PE4
FP31/PE3
FP32/PE2
FP33/PE1
FP34/PE0
O
O
O
O
O
O
O
O
15
14
13
48
49
50
51
VLCD1
VLCD2
VLCD3
BP3/PD3
BP2/PD2
BP1/PD1
BP0
I
I
I
O
O
O
O
9
10
11
12
FP35/PD7
FP36/PD6
FP37/PD5
FP38/PD4
O
O
O
O
*Open drain only when output
**The VPP pin should be connect to VDD in
single-chip mode.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
134
Freescale Semiconductor
Modes of Operation
A.7 Modes of Operation
The MC68HC705L16 has the following operating modes: single-chip mode (SCM) and bootstrap mode.
Single-chip mode, also called user mode, allows maximum use of pins for on-chip peripheral functions.
The bootstrap mode is provided for EPROM programming, dumping EPROM contents, and loading
programs into the internal RAM and executing them. This is a versatile mode because there are
essentially no limitations on the special-purpose program that is boot-loaded into the internal RAM.
A.7.1 Mode Entry
Mode entry is done at the rising edge of the RESET pin. Once the device enters one of the modes, the
mode cannot be changed by software. Only an external reset can change the mode.
At the rising edge of the RESET pin, the device latches the states of IRQ1 and IRQ2 and places itself in
the specified mode. While the RESET pin is low, all pins are configured as single-chip mode. Table A-3
shows the states of IRQ1 and IRQ2 for each mode entry.
High voltage VTST = 2 x VDD is required to select modes other than single-chip mode.
Table A-3. Mode Select Summary
Modes
RESET
Single-chip (user) mode
Bootstrap mode
PC6/IRQ1
PC7/IRQ2
VSS or VDD
VSS or VDD
VTST
VDD
SINGLE-CHIP MODE
VDD
RESET
VSS
VTST
VDD
IRQ1
VSS
VDD
IRQ2
VSS
VTST = 2 x VDD
Figure A-3. Mode Entry Diagram
A.7.2 Single-Chip Mode (SCM)
In this mode, all address and data bus activity occurs within the MCU. Thus, no external pins are required
for these functions. The single-chip mode allows the maximum number of I/O pins for on-chip peripheral
functions, for example, ports A through E, and LCD drivers.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
135
MC68HC705L16
A.7.3 Bootstrap Mode
In this mode, the reset vector is fetched from a 496-byte internal bootstrap ROM at $FE00–$FFEF. The
bootstrap ROM contains a small program which loads a program into the internal RAM and then passes
control to that program at location $0040 or executes the EPROM programming sequence and dumps
EPROM contents.
Since these modes are not normal user modes, all of the privileged control bits are accessible. This allows
the bootstrap mode to be used for self test of the device.
A.8 Memory Map
The MC68HC705L16 contains a 16,384-byte EPROM, 496 bytes of bootstrap ROM, and 512 bytes of
RAM. An additional 16 bytes of EPROM are provided for user vectors at $FFF0–$FFFF.
The MCU’s memory map is shown in Figure A-4.
0
$0000
RAM
512 BYTES
$00C0
$00FF
DUAL-MAPPED
I/O REGISTERS
16 BYTES
63
64
$003F
$0040
STACK 64 BYTES
$023F
$0240
191
192
255
256
575
576
0000
$0000
I/O
64 BYTES
$000F
$0010
0015
0016
I/O
48 BYTES
UNUSED
4095
4096
$0FFF
$1000
$003F
EPROM
16 KBYTES
0063
20479
20480
$4FFF
$5000
UNUSED
65023
65024
$FDFF
$FE00
BOOTSTRAP ROM
496 BYTES
$FFDF
$FFE0
$FFEF
$FFF0
$FFFF
TEST VECTORS
USER VECTORS
65503
65504
65519
65520
65535
Figure A-4. Memory Map
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
136
Freescale Semiconductor
Boot ROM
A.9 Boot ROM
Boot ROM is 496 bytes of mask ROM positioned at $FE00–$FFEF. This ROM contains bootstrap loader
programs and reset/interrupt vectors in the bootstrap mode. The bootstrap loader programs include:
• EPROM programming and verification
• Dumping EPROM contents
• Loading programs into the internal RAM
• Executing programs in the internal RAM
A.10 EPROM
The 16-Kbyte EPROM is positioned at $1000–$4FFF, and the additional 16 bytes of EPROM are located
at $FFF0–$FFFF for user vectors. The erased state of EPROM is read as $FF and EPROM power is
supplied from the VPP pin and the VDD pin.
The program control register (PCR) is provided for EPROM programming and testing. The functions of
EPROM depend on the device mode.
In user mode, ELAT and PGM bits in the PCR are available for user programming, and the remaining test
bits become read-only bits. The VPP pin should be tied to 5 volts or programming voltage.
A.10.1 Programming Sequence
To program the MC68HC705L16, execute this sequence:
• Set the ELAT bit
• Write the data to the address to be programmed
• Set the PGM bit
• Delay for an appropriate amount of time
• Clear the PGM bit and the ELAT bit
Clearing the PGM bit and the ELAT bit may be done on a single CPU write.
NOTE
It is important to remember that an external programming voltage must be
applied to the VPP pin while programming, but it should be equal to VDD
during normal operations.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
137
MC68HC705L16
A.10.2 Program Control Register
A program control register is provided for EPROM programming.
Address:
Read:
Write:
Reset:
$000D
Bit 7
6
5
4
3
2
1
Bit 0
R
R
R
R
R
R
ELAT
PGM
0
0
0
0
0
0
0
0
R
= Reserved
Figure A-5. Program Control Register (PCR)
Bits 7–3 — Reserved
These bits are reserved and read as logic 0 in user mode.
Bit 2 — Reserved
This bit is not used and always reads as logic 0.
ELAT — EPROM LATch control
0 = EPROM address and data bus configured for normal reads
1 = EPROM address and data bus configured for programming (Writes to EPROM cause address
and data to be latched.) EPROM is in programming mode and cannot be read if ELAT is logic
1. This bit should not be set when no programming voltage is applied to the VPP pin.
PGM — EPROM ProGraM command
0 = Programming power switched off from EPROM array
1 = Programming power switched on to EPROM array
If ELAT ≠ 1, then PGM = 0.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
138
Freescale Semiconductor
LCD 1/2 Duty and 1/2 Bias Timing Diagram
A.11 LCD 1/2 Duty and 1/2 Bias Timing Diagram
DUTY = 1/2
BIAS = 1/2 (VLCD1 = VLCD2 = VDD–VLCD/2, VLCD3 = VDD–VLCD)
1FRAME
BP0
VDD
VLCD1, 2
VLCD3
BP1
VDD
VLCD1, 2
VLCD3
FPx
(XX10)
VDD
VLCD1, 2
VLCD3
FPy
(XX00)
VDD
VLCD1, 2
VLCD3
+VLCD
+VLCD/2
0
–VLCD/2
BP0–FPx
(OFF)
–VLCD
+VLCD
+VLCD/2
0
–VLCD/2
–VLCD
BP1–FPx
(ON)
BP0–FPy
(OFF)
+VLCD
+VLCD/2
0
–VLCD/2
–VLCD
BP1–FPy
(OFF)
+VLCD
+VLCD/2
0
–VLCD/2
–VLCD
Figure A-6. CD 1/2 Duty and 1/2 Bias Timing Diagram
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
139
MC68HC705L16
A.12 Electrical Specifications
This section contains parametric and timing information for the MC68HC705L16.
A.12.1 Maximum Ratings
Maximum ratings are the extreme limits to which the microcontroller unit (MCU) can be exposed without
permanently damaging it.
The MCU contains circuitry to protect the inputs against damage from high static voltages; however, do
not apply voltages higher than those shown in this table. Keep VIn and VOut within the range
VSS ≤ (VIn or VOut) ≤ VDD. Connect unused inputs to the appropriate voltage level, either VSS or VDD.
Rating
Symbol
Value
Unit
VDD
VLCD1
VLCD2
VLCD3
–0.3 to +7.0
VSS –0.3 to VDD +0.3
VSS –0.3 to VDD +0.3
VSS –0.3 to VDD +0.3
V
Input voltage
VIn
VSS –0.3 to VDD + 0.3
V
Bootstrap mode
(IRQ1 pin only)
VIn
VSS –0.3 to
2 x VDD + 0.3
V
Output voltage
VOut
VSS –0.3 to VDD + 0.3
V
I
12.5
mA
TJ
+150
°C
Tstg
–55 to +150
°C
Supply voltage
Current drain per pin
excluding VDD and VSS
Operating junction temperature
Storage temperature range
NOTE
This device is not guaranteed to operate properly at the maximum ratings.
Refer to A.13.2 5.0-Volt DC Electrical Characteristics and A.13.3 3.3-Volt
DC Electrical Characteristics for guaranteed operating conditions.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
140
Freescale Semiconductor
Recommended Operating Conditions
A.12.2 Operating Temperature Range
Characteristic
Symbol
Value
Unit
TA
TL to TH
0 to +70
–40 to +85
°C
Symbol
Value
Unit
θJA
120
°C/W
Operating temperature range
MC68HC705L16 (standard)
MC68HC705L16C (extended)
A.12.3 Thermal Characteristics
Characteristic
Thermal resistance
80-pin plastic quad flat pack
A.13 Recommended Operating Conditions
Rating(1)
Symbol
Min
Typ
Max
Unit
(fOP = 2.1 MHz)
VDD
4.5
5.0
5.5
V
(fOP = 1.0 MHz)
VDD
3.0
—
5.5
V
Supply voltage
VLCD1
VDD – 1/3 VLCD
V
VLCD2
VDD – 2/3 VLCD
V
VLCD3
VDD – 3/3 VLCD
V
fOSC
—
3.52
4.2
MHz
C1
C2
—
—
33
33
—
—
pF
Slow clock oscillation frequency
fXOSC
—
32.768
—
MHz
External capacitance
(fXOSC = 32.768 kHz)
CX1
CX2
—
—
18
22
—
—
pF
Symbol
Min
Typ
Max
Unit
VPP
12.0
12.5
13.0
V
Fast clock oscillation frequency
External capacitance
(fOSC = 3.52 MHz)
1. +3.0 ≤ VDD ≤ +5.5 Vdc, VSS = 0 Vdc, TL ≤ TA ≤ TH, unless otherwise noted
A.13.1 EPROM Programming Voltage
Characteristics(1)
EPROM programming voltage
1. VDD = 5.0 Vdc, VSS = 0 Vdc, TA = 25 oC
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
141
MC68HC705L16
A.13.2 5.0-Volt DC Electrical Characteristics
Characteristic(1)
Symbol
Min
Typ
Max
Unit
VOL
VOH
—
VDD –0.1
—
—
0.1
—
V
Output high voltage (VDD = 5.0 V)
(ILoad = –0.4 mA) PA0–PA7, PC0–PC5, PD1–PD7, PE0–PE7
VOH
VDD –0.8
—
—
V
Output low voltage (VDD = 5.0 V)
(ILoad = 0.8 mA) PA0–PA7, PC0–PC7, PD1–PD7, PE0–PE7
VOL
—
—
0.4
V
Input high voltage
PA0–PA7, PB0–PB7, PC0–PC7, RESET, OSC1, XOSC1
VIH
0.8 x VDD
—
VDD
V
Input low voltage
PA0–PA7, PB0–PB7, PC0–PC7, RESET, OSC1, XOSC1
VIL
VSS
—
0.2 x VDD
V
—
—
6.0
3.0
12.0
6.0
mA
mA
—
—
3.0
17.0
10.0
—
µA
µA
—
—
± 1.0
µA
40
40
160
150
150
500
340
340
1000
µA
µA
µA
—
—
10
5
20
18
kΩ
kΩ
Output voltage
ILoad = 10.0 µA
ILoad = –10.0 µA
Supply current(2), (3), (4), (5)
Run (fOP = 2.1 MHz)
Wait (fOP = 2.1 MHz)
Stop
No clock
XOSC = 32.768 kHz, VDD = 5.0 V, TA = +25 oC
IDD
Input current(6) (with pullups disabled)
PA0–PA7, PB0–PB7, PC0–PC7, RESET, OSC1, XOSC1
IIn
Input current(6) (with pullups enabled, VDD = 5.0 V)
PA0–PA7
PB0–PB7
PC0–PC7
IIn
LCD pin output impedance
FP0–FP26
BP0–BP3
Zo, FP
Zo, BP
1. +4.5 ≤ VDD ≤ +5.5 Vdc, VSS = 0 Vdc, TL ≤ TA ≤ TH, unless otherwise noted. All values shown reflect average measurements.
Typical values at midpoint of voltage range, 25 °C only.
2. Run (Operating) IDD, wait IDD; measured using external square wave clock source (fOSC = 4.2 MHz); all inputs 0.2 V from
rail (VSS or VDD); no dc loads; less than 50 pF on all outputs; CL = 20 pF on OSC2
3. Wait, atop IDD; all ports configured as inputs; VIL = 0.2 V; VIH = VDD –0.2 V
4. Stop IDD measured with OSC1 = VSS.
5. Wait IDD is affected linearly by the OSC2 capacitance.
6. Input current measured with output transistor turned off and VIn = 0 V.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
142
Freescale Semiconductor
Recommended Operating Conditions
A.13.3 3.3-Volt DC Electrical Characteristics
Characteristic(1)
Symbol
Min
Typ
Max
Unit
VOL
VOH
—
VDD –0.1
—
—
0.1
—
V
Output high voltage (VDD = 3.5 V)
(ILoad = –0.4 mA) PA0–PA7, PC0–PC5, PD1–PD7, PE0–PE7
VOH
VDD –0.8
—
—
V
Output low voltage (VDD = 3.5 V)
(ILoad = 0.8 mA) PA0–PA7, PC0–PC7, PD1–PD7, PE0–PE7
VOL
—
—
0.4
V
Input high voltage
PA0–PA7, PB0–PB7, PC0–PC7, RESET, OSC1, XOSC1
VIH
0.8 x VDD
—
VDD
V
Input low voltage
PA0–PA7, PB0–PB7, PC0–PC7, RESET, OSC1, XOSC1
VIL
VSS
—
0.2 x VDD
V
—
—
1.8
0.8
8.0
5.0
mA
mA
—
—
2.0
8.0
10.0
—
µA
µA
—
—
± 1.0
µA
20
20
60
80
80
300
230
230
760
µA
µA
µA
—
—
10
5
20
18
kΩ
kΩ
Output voltage
ILoad = 10.0 µA
ILoad = –10.0 µA
Supply current(2), (3), (4), (5)
Run (fOP = 1.0 MHz)
Wait (fOP = 1.0 MHz)
Stop
No clock
XOSC = 32.768 kHz, VDD = 3.0 V, TA= +25 oC
IDD
Input current(6) (with pullups disabled)
PA0–PA7, PB0–PB7, PC0–PC7, RESET, OSC1, XOSC1
IIn
Input current(6) (with pullups enabled, VDD = 3.3 V)
PA0–PA7
PB0–PB7
PC0–PC7
IIn
LCD pin output impedance
FP0–FP26
BP0–BP3
Zo, FP
Zo, BP
1. +3.0 ≤ VDD < +4.5 Vdc, VSS = 0 Vdc, TL ≤ TA ≤ TH, unless otherwise noted. All values shown reflect average measurements.
Typical values at midpoint of voltage range, 25 °C only.
2. Run (Operating) IDD, wait IDD; measured using external square wave clock source (fOSC = 2.0 MHz); all inputs 0.2 V from
rail (VSS or VDD); no dc loads; less than 50 pF on all outputs; CL = 20 pF on OSC2
3. Wait, stop IDD; all ports configured as inputs; VIL = 0.2 V; VIH = VDD –0.2 V
4. Stop IDD measured with OSC1 = VSS.
5. Wait IDD is affected linearly by the OSC2 capacitance.
6. Input current measured with output transistor turned off and VIn = 0 V.
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
143
MC68HC705L16
A.13.4 3.3-Volt and 5.0-Volt Control Timing
Characteristic(1)
Symbol
Min
Max
Unit
Frequency of oscillation (OSC)
Crystal
External clock
fOSC
—
dc
4.2
4.2
MHz
Internal operating frequency(2), crystal or external
clock (fOSC/2)
VDD = 4.5 V to 5.5 V
VDD = 3.0 V to 5.5 V
fOP
—
—
2.1
1.0
MHz
Cycle time (fast OSC selected)
VDD = 4.5 V to 5.5 V
VDD = 3.0 V to 5.5 V
tcyc
480
1.0
—
—
ns
µs
RESET pulse width (when bus clock active)
tRL
1.5
—
tcyc
tRESL
tTH, tTL
4.0
284
—
—
tcyc
ns
Interrupt pulse width low (edge-triggered)
tILIH
284
—
ns
Interrupt pulse period(3)
tILIL
see note
—
tcyc
tOH, tOL
110
—
ns
Timer
Resolution
Input capture (TCAP) pulse width
OSC1 pulse width (external clock input)
1. +3.0 ≤ VDD ≤ +5.5 Vdc, VSS = 0 Vdc,TL ≤ TA ≤ TH, unless otherwise noted.
2. The system clock divider configuration (SYS1–SYS0 bits) should be selected such that the internal operating frequency
(fOP) does not exceed value specified in fOP for a given fOSC.
3. The minimum period, tILIL, should not be less than the number of cycle times it takes to execute the interrupt service routine
plus 21 tcyc.
A.14 MC Order Numbers
Table A-4 shows the MC order numbers for the available package types.
Table A-4. MC Order Numbers
Package Type
Operating
Temperature Range
MC Order Number
0°C to +70°C
MC68HC705L16FU
–40°C to +85°C
MC68HC705L16CFU
80-pin plastic quad flat pack (QFP)
MC68HC05L16 • MC68HC705L16 Data Sheet, Rev. 4.1
144
Freescale Semiconductor
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MC68HC05L16
Rev. 4.1, 9/2005
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