MOTOROLA MC68HC705J1AVP

MC68HC705J1A
MC68HRC705J1A
MC68HSC705J1A
MC68HSR705J1A
Technical Data
M68HC05
Microcontrollers
MC68HC705J1A/D
Rev. 4, 5/2002
WWW.MOTOROLA.COM/SEMICONDUCTORS
MC68HC705J1A
MC68HRC705J1A
MC68HSC705J1A
MC68HSR705J1A
Technical Data
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MC68HC705J1A — Rev. 4.0
MOTOROLA
© Motorola, Inc., 2002
Technical Data
3
Technical Data
Revision History
Date
May, 2002
Technical Data
4
Revision
Level
4.0
Description
Page
Number(s)
Figure 2-2. I/O Register Summary — Corrected reset state for
last entry (Mask Option Register)
37
Figure 2-4. Mask Option Register (MOR) — Corrected reset
state
41
6.3.3 Pulldown Register A — Corrected note
91
6.4.3 Pulldown Register B — Corrected note
94
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data — MC68HC705J1A
List of Sections
Section 1. General Description . . . . . . . . . . . . . . . . . . . . 21
Section 2. Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Section 3. Central Processor Unit (CPU) . . . . . . . . . . . . 45
Section 4. Resets and Interrupts . . . . . . . . . . . . . . . . . . . 69
Section 5. Low-Power Modes. . . . . . . . . . . . . . . . . . . . . . 79
Section 6. Parallel Input/Output (I/O) Ports . . . . . . . . . . 87
Section 7. Computer Operating Properly
(COP) Module . . . . . . . . . . . . . . . . . . . . . . . . . 97
Section 8. External Interrupt Module (IRQ). . . . . . . . . . 101
Section 9. Multifunction Timer Module . . . . . . . . . . . . . 109
Section 10. Electrical Specifications. . . . . . . . . . . . . . . 117
Section 11. Mechanical Specifications . . . . . . . . . . . . . 131
Section 12. Ordering Information . . . . . . . . . . . . . . . . . 135
Appendix A. MC68HRC705J1A . . . . . . . . . . . . . . . . . . . 137
Appendix B. MC68HSC705J1A . . . . . . . . . . . . . . . . . . . 141
Appendix C. MC68HSR705J1A . . . . . . . . . . . . . . . . . . . 145
Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
List of Sections
5
List of Sections
Technical Data
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MC68HC705J1A — Rev. 4.0
List of Sections
MOTOROLA
Technical Data — MC68HC705J1A
Table of Contents
Section 1. General Description
1.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1.3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.4
Programmable Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1.5
Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1.5.1
VDD and VSS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1.5.2
OSC1 and OSC2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
1.5.2.1
Crystal Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
1.5.2.2
Ceramic Resonator Oscillator . . . . . . . . . . . . . . . . . . . . . 28
1.5.2.3
RC Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
1.5.2.4
External Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
1.6
RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
1.7
IRQ/VPP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.8
PA0–PA7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.9
PB0–PB5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Section 2. Memory
2.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.3
Memory Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.4
Input/Output Register Summary . . . . . . . . . . . . . . . . . . . . . . . .35
2.5
RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
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2.6
EPROM/OTPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.6.1
EPROM/OTPROM Programming . . . . . . . . . . . . . . . . . . . . . 38
2.6.2
EPROM Programming Register . . . . . . . . . . . . . . . . . . . . . 39
2.6.3
EPROM Erasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
2.7
Mask Option Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2.8
EPROM Programming Characteristics . . . . . . . . . . . . . . . . . . . 43
Section 3. Central Processor Unit (CPU)
3.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.3
CPU Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.4
Arithmetic/Logic Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.5
CPU Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.5.1
Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.5.2
Index Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.5.3
Stack Pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.5.4
Program Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
3.5.5
Condition Code Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
3.6
Instruction Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
3.6.1
Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3.6.1.1
Inherent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
3.6.1.2
Immediate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3.6.1.3
Direct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.6.1.4
Extended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.6.1.5
Indexed, No Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.6.1.6
Indexed, 8-Bit Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.6.1.7
Indexed, 16-Bit Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3.6.1.8
Relative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
3.6.2
Instruction Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
3.6.2.1
Register/Memory Instructions . . . . . . . . . . . . . . . . . . . . . 55
3.6.2.2
Read-Modify-Write Instructions . . . . . . . . . . . . . . . . . . . . 56
3.6.2.3
Jump/Branch Instructions . . . . . . . . . . . . . . . . . . . . . . . .57
3.6.2.4
Bit Manipulation Instructions . . . . . . . . . . . . . . . . . . . . . . 59
3.6.2.5
Control Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
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Table of Contents
3.7
Instruction Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
3.8
Opcode Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Section 4. Resets and Interrupts
4.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
4.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
4.3
Resets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4.3.1
Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
4.3.2
External Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.3.3
COP Watchdog Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.3.4
Illegal Address Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.4
Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.4.1
Software Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.4.2
External Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
4.4.3
Timer Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.4.3.1
Real-Time Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.4.3.2
Timer Overflow Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.4.4
Interrupt Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Section 5. Low-Power Modes
5.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
5.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
5.3
Exiting Stop and Wait Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 80
5.4
Effects of Stop and Wait Modes . . . . . . . . . . . . . . . . . . . . . . . .81
5.4.1
Clock Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
5.4.2
CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
5.4.3
COP Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
5.4.4
Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
5.4.5
EPROM/OTPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
5.4.6
Data-Retention Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
5.5
Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
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Section 6. Parallel Input/Output (I/O) Ports
6.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
6.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
6.3
Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
6.3.1
Port A Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
6.3.2
Data Direction Register A. . . . . . . . . . . . . . . . . . . . . . . . . . . 90
6.3.3
Pulldown Register A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
6.3.4
Port A LED Drive Capability . . . . . . . . . . . . . . . . . . . . . . . . . 92
6.3.5
Port A I/O Pin Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
6.4
Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
6.4.1
Port B Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
6.4.2
Data Direction Register B. . . . . . . . . . . . . . . . . . . . . . . . . . . 93
6.4.3
Pulldown Register B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
6.5
5.0-Volt I/O Port Electrical Characteristics . . . . . . . . . . . . . . . . 95
6.6
3.3-Volt I/O Port Electrical Characteristics . . . . . . . . . . . . . . . . 95
Section 7. Computer Operating Properly
(COP) Module
7.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
7.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
7.3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
7.3.1
COP Watchdog Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
7.3.2
COP Watchdog Timeout Period . . . . . . . . . . . . . . . . . . . . . . 98
7.3.3
Clearing the COP Watchdog . . . . . . . . . . . . . . . . . . . . . . . .98
7.4
Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
7.5
COP Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
7.6
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
7.6.1
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
7.6.2
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
Technical Data
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Table of Contents
Section 8. External Interrupt Module (IRQ)
8.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
8.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
8.3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
8.3.1
IRQ/VPP Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
8.3.2
Optional External Interrupts . . . . . . . . . . . . . . . . . . . . . . . . 104
8.4
IRQ Status and Control Register . . . . . . . . . . . . . . . . . . . . . . 106
8.5
External Interrupt Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
8.5.1
5.0-Volt External Interrupt Timing Characteristics . . . . . . . 107
8.5.2
3.3-Volt External Interrupt Timing Characteristics . . . . . . . 107
Section 9. Multifunction Timer Module
9.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
9.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
9.3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
9.4
Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
9.5
I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
9.5.1
Timer Status and Control Register . . . . . . . . . . . . . . . . . . .112
9.5.2
Timer Counter Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
9.6
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
9.6.1
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115
9.6.2
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115
Section 10. Electrical Specifications
10.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
10.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
10.3
Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
10.4
Operating Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . 119
10.5
Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
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10.6
Power Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
10.7
5.0-Volt DC Electrical Characteristics. . . . . . . . . . . . . . . . . . .121
10.8
3.3-Volt DC Electrical Characteristics . . . . . . . . . . . . . . . . . . 122
10.9
Driver Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
10.10 Typical Supply Currents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
10.11 EPROM Programming Characteristics . . . . . . . . . . . . . . . . . . 126
10.12 5.0-Volt Control Timing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
10.13 3.3-Volt Control Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Section 11. Mechanical Specifications
11.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
11.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
11.3
Plastic Dual In-Line Package (Case 738) . . . . . . . . . . . . . . . . 132
11.4
Small Outline Integrated Circuit (Case 751) . . . . . . . . . . . . . .132
11.5
Ceramic Dual In-Line Package (Case 732) . . . . . . . . . . . . . . 133
Section 12. Ordering Information
12.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
12.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
12.3
MCU Order Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Appendix A. MC68HRC705J1A
A.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
A.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
A.3
RC Oscillator Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
A.4
Typical Internal Operating Frequency
for RC Oscillator Option. . . . . . . . . . . . . . . . . . . . . . . . . . . 139
A.5
Package Types and Order Numbers . . . . . . . . . . . . . . . . . . . 140
Technical Data
12
MC68HC705J1A — Rev. 4.0
Table of Contents
MOTOROLA
Table of Contents
Appendix B. MC68HSC705J1A
B.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
B.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
B.3
5.0-Volt DC Electrical Characteristics. . . . . . . . . . . . . . . . . . .142
B.4
3.3-Volt DC Electrical Characteristics. . . . . . . . . . . . . . . . . . .142
B.5
Typical Supply Currents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
B.6
Package Types and Order Numbers . . . . . . . . . . . . . . . . . . . 144
Appendix C. MC68HSR705J1A
C.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
C.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
C.3
RC Oscillator Connections (External Resistor). . . . . . . . . . . . 145
C.4
Typical Internal Operating Frequency at 25°C
for High-Speed RC Oscillator Option. . . . . . . . . . . . . . . . . 146
C.5
RC Oscillator Connections (No External Resistor) . . . . . . . . .147
C.6
Typical Internal Operating Frequency versus Temperature
(No External Resistor) . . . . . . . . . . . . . . . . . . . . . . . . . . . .148
C.7
Package Types and Order Numbers . . . . . . . . . . . . . . . . . . . 149
Index
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
MC68HC705J1A — Rev. 4.0
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Technical Data
Table of Contents
13
Table of Contents
Technical Data
14
MC68HC705J1A — Rev. 4.0
Table of Contents
MOTOROLA
Technical Data — MC68HC705J1A
List of Figures
Figure
1-1
1-2
1-3
1-4
Title
1-8
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Pin Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Bypassing Layout Recommendation . . . . . . . . . . . . . . . . . . 26
Crystal Connections with
Oscillator Internal Resistor Mask Option . . . . . . . . . . . . . 28
Crystal Connections without
Oscillator Internal Resistor Mask Option . . . . . . . . . . . . . 28
Ceramic Resonator Connections
with Oscillator Internal Resistor Mask Option . . . . . . . . . 29
Ceramic Resonator Connections
without Oscillator Internal Resistor Mask Option. . . . . . . 29
External Clock Connections . . . . . . . . . . . . . . . . . . . . . . . . . 30
2-1
2-2
2-3
2-4
Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
I/O Register Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
EPROM Programming Register (EPROG). . . . . . . . . . . . . . 39
Mask Option Register (MOR) . . . . . . . . . . . . . . . . . . . . . . . .41
3-1
3-2
3-3
3-4
3-5
3-6
Programming Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Accumulator (A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Index Register (X) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Stack Pointer (SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Program Counter (PC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Condition Code Register (CCR) . . . . . . . . . . . . . . . . . . . . . . 50
4-1
4-2
Reset Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Power-On Reset Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
1-5
1-6
1-7
MC68HC705J1A — Rev. 4.0
MOTOROLA
Page
Technical Data
List of Figures
15
List of Figures
Figure
Title
4-3
4-4
4-5
4-6
4-7
External Reset Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
External Interrupt Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
External Interrupt Timing . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Interrupt Stacking Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Interrupt Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
5-1
5-2
Stop Mode Recovery Timing . . . . . . . . . . . . . . . . . . . . . . . .85
Stop/Halt/Wait Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
6-1
6-2
6-3
6-4
6-5
6-6
6-7
6-8
6-9
Parallel I/O Port Register Summary . . . . . . . . . . . . . . . . . . . 88
Port A Data Register (PORTA). . . . . . . . . . . . . . . . . . . . . . . 89
Data Direction Register A (DDRA) . . . . . . . . . . . . . . . . . . . .90
Port A I/O Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Pulldown Register A (PDRA) . . . . . . . . . . . . . . . . . . . . . . . .91
Port B Data Register (PORTB). . . . . . . . . . . . . . . . . . . . . . . 92
Data Direction Register B (DDRB) . . . . . . . . . . . . . . . . . . . .93
Port B I/O Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Pulldown Register B (PDRB) . . . . . . . . . . . . . . . . . . . . . . . .94
7-1
COP Register (COPR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
8-1
8-2
8-3
8-4
IRQ Module Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . 102
Interrupt Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
IRQ Status and Control Register (ISCR) . . . . . . . . . . . . . . 106
External Interrupt Timing . . . . . . . . . . . . . . . . . . . . . . . . . . 107
9-1
9-2
9-3
9-4
Multifunction Timer Block Diagram. . . . . . . . . . . . . . . . . . .110
I/O Register Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Timer Status and Control Register (TSCR) . . . . . . . . . . . . 112
Timer Counter Register (TCR) . . . . . . . . . . . . . . . . . . . . . . 114
Technical Data
16
Page
MC68HC705J1A — Rev. 4.0
List of Figures
MOTOROLA
List of Figures
Figure
10-1
10-2
10-3
10-4
10-5
10-6
10-7
10-8
10-9
Title
PA0–PA7, PB0–PB5 Typical High-Side
Driver Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 123
PA0–PA3, PB0–PB5 Typical Low-Side
Driver Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 123
PA4–PA7 Typical Low-Side Driver Characteristics . . . . . . 124
Typical Operating IDD (25°C) . . . . . . . . . . . . . . . . . . . . . . .125
Typical Wait Mode IDD (25°C) . . . . . . . . . . . . . . . . . . . . . . 125
External Interrupt Timing . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Stop Mode Recovery Timing . . . . . . . . . . . . . . . . . . . . . . .128
Power-On Reset Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
External Reset Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
A-1
A-2
RC Oscillator Connections . . . . . . . . . . . . . . . . . . . . . . . . . 138
Typical Internal Operating Frequency
for Various VDD at 25°C — RC Oscillator
Option Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
B-1
B-2
Typical High-Speed Operating IDD (25°C) . . . . . . . . . . . . . 142
Typical High-Speed Wait Mode IDD (25°C) . . . . . . . . . . . . 143
C-1
Typical Internal Operating Frequency
at 25°C for High-Speed RC Oscillator Option . . . . . . . . 146
RC Oscillator Connections (No External Resistor) . . . . . . . 147
Typical Internal Operating Frequency
versus Temperature (OSCRES Bit = 1) . . . . . . . . . . . . 148
C-2
C-3
MC68HC705J1A — Rev. 4.0
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Technical Data
List of Figures
17
List of Figures
Technical Data
18
MC68HC705J1A — Rev. 4.0
List of Figures
MOTOROLA
Technical Data — MC68HC705J1A
List of Tables
Table
Title
1-1
Programmable Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3-1
3-2
3-3
3-4
3-5
3-6
3-7
Register/Memory Instructions. . . . . . . . . . . . . . . . . . . . . . . . . 55
Read-Modify-Write Instructions . . . . . . . . . . . . . . . . . . . . . . . 56
Jump and Branch Instructions . . . . . . . . . . . . . . . . . . . . . . . .58
Bit Manipulation Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . 59
Control Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Instruction Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Opcode Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
4-1
4-2
4-3
4-4
External Reset Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
External Interrupt Timing (VDD = 5.0 Vdc) . . . . . . . . . . . . . . . 75
External Interrupt Timing (VDD = 3.3 Vdc) . . . . . . . . . . . . . . . 75
Reset/Interrupt Vector Addresses . . . . . . . . . . . . . . . . . . . . . 77
6-1
6-2
Port A Pin Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Port B Pin Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
9-1
Real-Time Interrupt Rate Selection . . . . . . . . . . . . . . . . . . . 114
12-1
Order Numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
A-1
MC68HRC705J1A (RC Oscillator Option)
Order Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140
B-1
MC68HSC705J1A (High Speed) Order Numbers . . . . . . . . 144
C-1
MC68HSR705J1A (High-Speed RC Oscillator Option)
Order Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149
MC68HC705J1A — Rev. 4.0
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Technical Data
List of Tables
19
List of Tables
Technical Data
20
MC68HC705J1A — Rev. 4.0
List of Tables
MOTOROLA
Technical Data — MC68HC705J1A
Section 1. General Description
1.1 Contents
1.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1.3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.4
Programmable Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1.5
Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1.5.1
VDD and VSS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1.5.2
OSC1 and OSC2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
1.5.2.1
Crystal Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
1.5.2.2
Ceramic Resonator Oscillator . . . . . . . . . . . . . . . . . . . . . 28
1.5.2.3
RC Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
1.5.2.4
External Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
1.6
RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
1.7
IRQ/VPP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.8
PA0–PA7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.9
PB0–PB5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
MC68HC705J1A — Rev. 4.0
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Technical Data
General Description
21
General Description
1.2 Introduction
The MC68HC705J1A is a member of Motorola’s low-cost,
high-performance M68HC05 Family of 8-bit microcontroller units
(MCUs). The M68HC05 Family is based on the customer-specified
integrated circuit (CSIC) design strategy. All MCUs in the family use the
popular M68HC05 central processor unit (CPU) and are available with a
variety of subsystems, memory sizes and types, and package types.
On-chip memory of the MC68HC705J1A includes 1240 bytes of
erasable, programmable read-only memory (EPROM). In packages
without the transparent window for EPROM erasure, the 1240 EPROM
bytes serve as one-time programmable read-only memory (OTPROM).
The MC68HRC705J1A is a resistor-capacitor (RC) oscillator mask
option version of the MC68HC705J1A and is discussed in Appendix A.
MC68HRC705J1A.
A high-speed version of the MC68HC705J1A, the MC68HSC705J1A, is
discussed in Appendix B. MC68HSC705J1A.
The MC68HSR705J1A, discussed in Appendix C. MC68HSR705J1A,
is a high-speed version of the MC68HRC705J1A.
A functional block diagram of the MC68HC705J1A is shown in
Figure 1-1.
Technical Data
22
MC68HC705J1A — Rev. 4.0
General Description
MOTOROLA
General Description
Introduction
OSC1
OSC2
INTERNAL
OSCILLATOR
15-STAGE
MULTIFUNCTION
TIMER SYSTEM
DIVIDE
BY ³2
ALU
68HC05 CPU
IRQ/VPP
ACCUMULATOR
CPU REGISTERS
INDEX REGISTER
0 0 0 0 0 0 0 0 1 1 STK PTR
PB5
PB4
PORT B
CPU CONTROL
RESET
DATA DIRECTION REGISTER B
WATCHDOG AND
ILLEGAL ADDRESS
DETECT
PB3
PB2
PB1
PB0
STATIC RAM (SRAM) — 64 BYTES
USER EPROM — 1240 BYTES
PA7*
PA6*
PA5*
PORT A
CONDITION CODE
REGISTER 1 1 1 H I N Z C
DATA DIRECTION REGISTER A
PROGRAM COUNTER
PA4*
PA3**
PA2**
PA1**
PA0**
*10-mA sink capability
**External interrupt capability
MASK OPTION REGISTER (EPROM)
Figure 1-1. Block Diagram
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
General Description
23
General Description
1.3 Features
Features of the MC68HC705J1A include:
•
Peripheral modules:
– 15-stage multifunction timer
– Computer operating properly (COP) watchdog
•
14 bidirectional input/output (I/O) lines, including:
– 10-mA sink capability on four I/O pins
– Mask option register (MOR) and software programmable
pulldowns on all I/O pins
– MOR selectable interrupt on four I/O pins, a keyboard scan
feature
•
MOR selectable sensitivity on external interrupt (edge- and
level-sensitive or edge-sensitive only)
•
On-chip oscillator with connections for:
– Crystal
– Ceramic resonator
– Resistor-capacitor (RC) oscillator
– External clock
•
1240 bytes of EPROM/OTPROM, including eight bytes for user
vectors
•
64 bytes of user random-access memory (RAM)
•
Memory-mapped I/O registers
•
Fully static operation with no minimum clock speed
•
Power-saving stop, halt, wait, and data-retention modes
•
External interrupt mask bit and acknowledge bit
•
Illegal address reset
•
Internal steering diode and pullup resistor from RESET pin to VDD
Technical Data
24
MC68HC705J1A — Rev. 4.0
General Description
MOTOROLA
General Description
Programmable Options
1.4 Programmable Options
The options in Table 1-1 are programmable in the mask option register
(MOR).
Table 1-1. Programmable Options
Feature
Option
COP watchdog timer
Enabled or disabled
External interrupt triggering
Edge-sensitive only or edge- and level-sensitive
Port A IRQ pin interrupts
Enabled or disabled
Port pulldown resistors
Enabled or disabled
STOP instruction mode
Stop mode or halt mode
Crystal oscillator internal resistor
Enabled or disabled
EPROM security
Enabled or disabled
Short oscillator delay counter
Enabled or disabled
1.5 Pin Assignments
Figure 1-2 shows the MC68HC705J1A pin assignments.
1.5.1 VDD and VSS
VDD and VSS are the power supply and ground pins. The MCU operates
from a single power supply.
Very fast signal transitions occur on the MCU pins, placing high,
short-duration current demands on the power supply. To prevent noise
problems, take special care as Figure 1-3 shows, by placing the bypass
capacitors as close as possible to the MCU. C2 is an optional bulk
current bypass capacitor for use in applications that require the port pins
to source high current levels.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
General Description
25
General Description
OSC1
1
20
RESET
OSC2
2
19
IRQ/VPP
PB5
3
18
PA0
PB4
4
17
PA1
PB3
5
16
PA2
PB2
6
15
PA3
PB1
7
14
PA4
PB0
8
13
PA5
VDD
9
12
PA6
VSS
10
11
PA7
Figure 1-2. Pin Assignments
V+
VDD
VDD
MCU
C1
0.1 µF
C2
+
C2
C1
VSS
VSS
Figure 1-3. Bypassing Layout Recommendation
Technical Data
26
MC68HC705J1A — Rev. 4.0
General Description
MOTOROLA
General Description
Pin Assignments
1.5.2 OSC1 and OSC2
The OSC1 and OSC2 pins are the connections for the on-chip oscillator.
The oscillator can be driven by any of these:
1. Crystal (See Figure 1-4 and Figure 1-5.)
2. Ceramic resonator (See Figure 1-6 and Figure 1-7.)
3. Resistor/capacitor (RC) oscillator (Refer to Appendix A.
MC68HRC705J1A and Appendix C. MC68HSR705J1A.)
4. External clock signal (See Figure 1-8.)
The frequency, fosc, of the oscillator or external clock source is divided
by two to produce the internal operating frequency, fop.
1.5.2.1 Crystal Oscillator
Figure 1-4 and Figure 1-5 show a typical crystal oscillator circuit for an
AT-cut, parallel resonant crystal. Follow the crystal supplier’s
recommendations, as the crystal parameters determine the external
component values required to provide reliable startup and maximum
stability. The load capacitance values used in the oscillator circuit design
should include all stray layout capacitances.
To minimize output distortion, mount the crystal and capacitors as close
as possible to the pins. An internal startup resistor of approximately
2 MΩ is provided between OSC1 and OSC2 for the crystal oscillator as
a programmable mask option.
NOTE:
Use an AT-cut crystal and not an AT-strip crystal because the MCU can
overdrive an AT-strip crystal.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
General Description
27
General Description
VSS
MCU
C3
XTAL
OSC2
OSC1
OSC1
OSC2
C4
XTAL
C3
27 pF
C4
27 pF
VDD
C2
C1
VSS
Figure 1-4. Crystal Connections with
Oscillator Internal Resistor Mask Option
VSS
C3
MCU
R
10 M¾Ω
OSC2
OSC1
OSC1
XTAL
R
OSC2
C4
VDD
XTAL
C3
27 pF
C4
27 pF
C2
C1
VSS
Figure 1-5. Crystal Connections without
Oscillator Internal Resistor Mask Option
1.5.2.2 Ceramic Resonator Oscillator
To reduce cost, use a ceramic resonator instead of the crystal. The
circuits shown in Figure 1-6 and Figure 1-7 show ceramic resonator
circuits. Follow the resonator manufacturer’s recommendations, as the
resonator parameters determine the external component values
required for maximum stability and reliable starting. The load
capacitance values used in the oscillator circuit design should include all
stray capacitances.
Technical Data
28
MC68HC705J1A — Rev. 4.0
General Description
MOTOROLA
General Description
Pin Assignments
Mount the resonator and components as close as possible to the pins for
startup stabilization and to minimize output distortion. An internal startup
resistor of approximately 2 MΩ is provided between OSC1 and OSC2 as
a programmable mask option.
VSS
CERAMIC
RESONATOR
C3
27 pF
C3
OSC1
CERAMIC
RESONATOR
OSC2
OSC1
MCU
OSC2
C4
C4
27 pF
VDD
C2
C1
VSS
Figure 1-6. Ceramic Resonator Connections
with Oscillator Internal Resistor Mask Option
VSS
C3
CERAMIC
RESONATOR
R
10 M¾Ω
OSC2
OSC1
MCU
OSC1
R
OSC2
C4
C3
27 pF
CERAMIC
RESONATOR
VDD
C4
27 pF
C2
C1
VSS
Figure 1-7. Ceramic Resonator Connections
without Oscillator Internal Resistor Mask Option
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
General Description
29
General Description
1.5.2.3 RC Oscillator
Refer to Appendix A. MC68HRC705J1A and Appendix C.
MC68HSR705J1A.
1.5.2.4 External Clock
An external clock from another complementary metal-oxide
semiconductor (CMOS)-compatible device can be connected to the
OSC1 input, with the OSC2 input not connected, as shown in
Figure 1-8. This configuration is possible regardless of whether the
crystal/ceramic resonator or the RC oscillator is enabled.
OSC2
OSC1
MCU
EXTERNAL
CMOS CLOCK
Figure 1-8. External Clock Connections
1.6 RESET
Applying a logic 0 to the RESET pin forces the MCU to a known startup
state. An internal reset also pulls the RESET pin low. An internal resistor
to VDD pulls the RESET pin high. A steering diode between the RESET
and VDD pins discharges any RESET pin voltage when power is
removed from the MCU. The RESET pin contains an internal Schmitt
trigger to improve its noise immunity as an input. Refer to Section 4.
Resets and Interrupts for more information.
Technical Data
30
MC68HC705J1A — Rev. 4.0
General Description
MOTOROLA
General Description
IRQ/VPP
1.7 IRQ/VPP
The external interrupt/programming voltage pin (IRQ/VPP) drives the
asynchronous IRQ interrupt function of the CPU. Additionally, it is used
to program the user EPROM and mask option register. (See Section 2.
Memory and Section 8. External Interrupt Module (IRQ).)
The LEVEL bit in the mask option register provides negative
edge-sensitive triggering or both negative edge-sensitive and low
level-sensitive triggering for the interrupt function.
If level-sensitive triggering is selected, the IRQ/VPP input requires an
external resistor to VDD for wired-OR operation. If the IRQ/VPP pin is not
used, it must be tied to the VDD supply.
The IRQ/VPP pin contains an internal Schmitt trigger as part of its input
to improve noise immunity. The voltage on this pin should not exceed
VDD except when the pin is being used for programming the EPROM.
NOTE:
The mask option register can enable the PA0–PA3 pins to function as
external interrupt pins.
1.8 PA0–PA7
These eight input/output (I/O) lines comprise port A, a general-purpose,
bidirectional I/O port. See Section 8. External Interrupt Module (IRQ)
for information on PA0–PA3 external interrupts.
1.9 PB0–PB5
These six I/O lines comprise port B, a general-purpose, bidirectional I/O
port.
MC68HC705J1A — Rev. 4.0
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Technical Data
General Description
31
General Description
Technical Data
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MC68HC705J1A — Rev. 4.0
General Description
MOTOROLA
Technical Data — MC68HC705J1A
Section 2. Memory
2.1 Contents
2.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.3
Memory Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.4
Input/Output Register Summary . . . . . . . . . . . . . . . . . . . . . . . .35
2.5
RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.6
EPROM/OTPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.6.1
EPROM/OTPROM Programming . . . . . . . . . . . . . . . . . . . . . 38
2.6.2
EPROM Programming Register . . . . . . . . . . . . . . . . . . . . . 39
2.6.3
EPROM Erasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
2.7
Mask Option Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2.8
EPROM Programming Characteristics . . . . . . . . . . . . . . . . . . . 43
2.2 Introduction
This section describes the organization of the on-chip memory
consisting of:
•
1232 bytes of user erasable, programmable read-only memory
(EPROM), plus eight bytes for user vectors
•
64 bytes of user random-access memory (RAM)
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MOTOROLA
Technical Data
Memory
33
Memory
2.3 Memory Map
Port A Data Register (PORTA)
Port B Data Register (PORTB)
Unimplemented
Data Direction Register A (DDRA)
Data Direction Register B (DDRB)
Unimplemented
$0000
↓
$001F
$0020
↓
$00BF
$00C0
↓
$00FF
$0100
↓
$02FF
$0300
↓
$07CF
$07D0
↓
$07ED
$07EE
$07EF
$07F0
↓
$07FF
Timer Status and Control Register (TSCR)
Timer Control Register (TCR)
IRQ Status and Control Register (ISCR)
I/O Registers
32 Bytes
Unimplemented
Unimplemented
160 Bytes
Pulldown Register Port A (PDRA)
Pulldown Register Port B (PDRB)
RAM
64 Bytes
Unimplemented
EPROM Programming Register (EPROG)
Unimplemented
512 Bytes
Unimplemented
EPROM
1232 Bytes
Reserved
COP Register (COPR)(1)
Mask Option Register (MOR)
Unimplemented
30 Bytes
Reserved
Test ROM
2 Bytes
Timer Interrupt Vector High
Timer Interrupt Vector Low
External Interrupt Vector High
External Interrupt Vector Low
Software Interrupt Vector High
Software Interrupt Vector Low
Reset Vector High
Reset Vector Low
Registers and EPROM
16 Bytes
(1)
$0000
$0001
$0002
$0003
$0004
$0005
$0006
$0007
$0008
$0009
$000A
$000B
↓
$000F
$0010
$0011
$0012
↓
$0017
$0018
$0019
↓
$001E
$001F
$07F0
$07F1
$07F2
↓
$07F7
$07F8
$07F9
$07FA
$07FB
$07FC
$07FD
$07FE
$07FF
Writing to bit 0 of $07F0 clears the computer
operating properly (COP) watchdog.
Figure 2-1. Memory Map
Technical Data
34
MC68HC705J1A — Rev. 4.0
Memory
MOTOROLA
Memory
Input/Output Register Summary
2.4 Input/Output Register Summary
Addr.
$0000
$0001
Register Name
Read:
Port A Data Register
(PORTA) Write:
See page 89.
Reset:
Read:
Port B Data Register
(PORTB) Write:
See page 92.
Reset:
$0002
Unimplemented
$0003
Unimplemented
Bit 7
6
5
4
3
2
1
Bit 0
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
PB2
PB1
PB0
Unaffected by reset
0
PB5
$0006
Unimplemented
$0007
Unimplemented
$0008
Read:
Timer Status and Control
Register (TSCR) Write:
See page 112.
Reset:
PB4
PB3
Unaffected by reset
Read:
Data Direction Register A
DDRA7
$0004
(DDRA) Write:
See page 90.
Reset:
0
Read:
Data Direction Register B
$0005
(DDRB) Write:
See page 93.
Reset:
0
0
DDRA6
DDRA5
DDRA4
DDRA3
DDRA2
DDRA1
DDRA0
0
0
0
0
0
0
0
DDRB5
DDRB4
DDRB3
DDRB2
DDRB1
DDRB0
0
0
0
0
0
0
0
0
TOIE
RTIE
RT1
RT0
TOFR
RTIFR
0
0
1
1
0
0
0
TOF
RTIF
0
0
0
= Unimplemented
0
R = Reserved
Figure 2-2. I/O Register Summary (Sheet 1 of 3)
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Technical Data
Memory
35
Memory
Addr.
$0009
$000A
Register Name
Read:
Timer Counter Register
(TCR) Write:
See page 114.
Reset:
Read:
IRQ Status and Control
Register (ISCR) Write:
See page 106.
Reset:
$000B
Bit 7
6
5
4
3
2
1
Bit 0
TMR7
TMR6
TMR5
TMR4
TMR3
TMR2
TMR1
TMR0
0
0
0
0
0
0
0
0
0
0
0
IRQF
0
0
0
IRQE
R
IRQR
1
0
0
0
0
0
0
0
PDIA7
PDIA6
PDIA5
PDIA4
PDIA3
PDIA2
PDIA1
PDIA0
0
0
0
0
0
0
0
0
PDIB5
PDIB4
PDIB3
PDIB2
PDIB1
PDIB0
0
0
0
ELAT
MPGM
EPGM
0
0
0
Unimplemented
↓
$000F
$0010
$0011
Unimplemented
Read:
Pulldown Register A
(PDRA) Write:
See page 91.
Reset:
Read:
Pulldown Register B
(PDRB) Write:
See page 94.
Reset:
$0012
0
0
0
0
0
0
0
0
0
0
R
R
R
R
0
0
0
0
Unimplemented
↓
$0017
Unimplemented
$0018
Read:
EPROM Programming
Register (EPROG) Write:
See page 39.
Reset:
0
= Unimplemented
R = Reserved
Figure 2-2. I/O Register Summary (Sheet 2 of 3)
Technical Data
36
MC68HC705J1A — Rev. 4.0
Memory
MOTOROLA
Memory
RAM
Addr.
Register Name
$0019
Unimplemented
Bit 7
6
5
4
3
2
1
Bit 0
R
R
R
R
R
R
R
R
↓
$001E
Unimplemented
$001F
Reserved
Read:
COP Register
(COPR) Write:
See page 99.
Reset:
$07F0
$07F1
Read:
Mask Option Register
SOSCD
(MOR) Write:
See page 41.
Reset:
COPC
0
EPMSEC OSCRES
SWAIT
SWPDI
PIRQ
LEVEL
COPEN
Unaffected by reset
= Unimplemented
R = Reserved
Figure 2-2. I/O Register Summary (Sheet 3 of 3)
2.5 RAM
The 64 addresses from $00C0 to $00FF serve as both the user RAM and
the stack RAM. Before processing an interrupt, the central processor
unit (CPU) uses five bytes of the stack to save the contents of the CPU
registers. During a subroutine call, the CPU uses two bytes of the stack
to store the return address. The stack pointer decrements when the CPU
stores a byte on the stack and increments when the CPU retrieves a byte
from the stack.
NOTE:
Be careful when using nested subroutines or multiple interrupt levels.
The CPU may overwrite data in the RAM during a subroutine or during
the interrupt stacking operation.
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Technical Data
Memory
37
Memory
2.6 EPROM/OTPROM
A microcontroller unit (MCU) with a quartz window has 1240 bytes of
erasable, programmable ROM (EPROM). The quartz window allows
EPROM erasure with ultraviolet light.
NOTE:
Keep the quartz window covered with an opaque material except when
programming the MCU. Ambient light can affect MCU operation.
In an MCU without the quartz window, the EPROM cannot be erased
and serves as 1240 bytes of one-time programmable ROM (OTPROM).
These addresses are user EPROM/OTPROM locations:
•
$0300–$07CF
•
$07F8–$07FF, used for user-defined interrupt and reset vectors
The computer operating properly (COP) register (COPR) is an
EPROM/OTPROM location at address $07F0.
The mask option register (MOR) is an EPROM/OTPROM location at
address $07F1.
2.6.1 EPROM/OTPROM Programming
The two ways to program the EPROM/OTPROM are:
1. Manipulating the control bits in the EPROM programming register
to program the EPROM/OTPROM on a byte-by-byte basis
2. Programming the EPROM/OTPROM with the M68HC705J
in-circuit simulator (M68HC705JICS) available from Motorola
Technical Data
38
MC68HC705J1A — Rev. 4.0
Memory
MOTOROLA
Memory
EPROM/OTPROM
2.6.2 EPROM Programming Register
The EPROM programming register (EPROG) contains the control bits
for programming the EPROM/OTPROM.
Address:
Read:
$0018
Bit 7
6
5
4
3
0
0
0
0
0
R
R
R
R
0
0
0
0
Write:
Reset:
0
= Unimplemented
2
1
Bit 0
ELAT
MPGM
EPGM
0
0
0
R = Reserved
Figure 2-3. EPROM Programming Register (EPROG)
ELAT — EPROM Bus Latch Bit
This read/write bit latches the address and data buses for
EPROM/OTPROM programming. Clearing the ELAT bit automatically
clears the EPGM bit. EPROM/OTPROM data cannot be read while
the ELAT bit is set. Reset clears the ELAT bit.
1 = Address and data buses configured for EPROM/OTPROM
programming the EPROM
0 = Address and data buses configured for normal operation
MPGM — MOR Programming Bit
This read/write bit applies programming power from the IRQ/VPP pin
to the mask option register. Reset clears MPGM.
1 = Programming voltage applied to MOR
0 = Programming voltage not applied to MOR
EPGM — EPROM Programming Bit
This read/write bit applies the voltage from the IRQ/VPP pin to the
EPROM. To write the EPGM bit, the ELAT bit must be set already.
Reset clears EPGM.
1 = Programming voltage (IRQ/VPP pin) applied to EPROM
0 = Programming voltage (IRQ/VPP pin) not applied to EPROM
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Technical Data
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Memory
NOTE:
Writing logic 1s to both the ELAT and EPGM bits with a single instruction
sets ELAT and clears EPGM. ELAT must be set first by a separate
instruction.
Bits [7:3] — Reserved
Take these steps to program a byte of EPROM/OTPROM:
1. Apply the programming voltage, VPP, to the IRQ/VPP pin.
2. Set the ELAT bit.
3. Write to any EPROM/OTPROM address.
4. Set the EPGM bit and wait for a time, tEPGM.
5. Clear the ELAT bit.
2.6.3 EPROM Erasing
The erased state of an EPROM bit is logic 0. Erase the EPROM by
exposing it to 15 Ws/cm2 of ultraviolet light with a wave length of
2537 angstroms. Position the ultraviolet light source one inch from the
EPROM. Do not use a shortwave filter.
2.7 Mask Option Register
The mask option register (MOR) is an EPROM/OTPROM byte that
controls these options:
•
COP watchdog (enable or disable)
•
External interrupt pin triggering (edge-sensitive only or edge- and
level-sensitive)
•
Port A external interrupts (enable or disable)
•
Port pulldown resistors (enable or disable)
•
STOP instruction (stop mode or halt mode)
•
Crystal oscillator internal resistor (enable or disable)
•
EPROM security (enable or disable)
•
Short oscillator delay (enable or disable)
Technical Data
40
MC68HC705J1A — Rev. 4.0
Memory
MOTOROLA
Memory
Mask Option Register
Take these steps to program the mask option register:
1. Apply the programming voltage, VPP, to the IRQ/VPP pin.
2. Write to the MOR.
3. Set the MPGM bit and wait for a time, tMPGM.
4. Clear the MPGM bit.
5. Reset the MCU.
Address:
$07F1
Bit 7
6
5
4
3
2
1
Bit 0
SWAIT
SWPDI
PIRQ
LEVEL
COPEN
Read:
SOSCD
EPMSEC OSCRES
Write:
Reset:
Unaffected by reset
Figure 2-4. Mask Option Register (MOR)
SOSCD — Short Oscillator Delay Bit
The SOSCD bit controls the oscillator stabilization counter. The
normal stabilization delay following reset or exit from stop mode is
4064 tcyc. Setting SOSCD enables a short oscillator stabilization
delay.
1 = Short oscillator delay enabled
0 = Short oscillator delay disabled
EPMSEC — EPROM Security Bit
The EPMSEC bit controls access to the EPROM/OTPROM.
1 = External access to EPROM/OTPROM denied
0 = External access to EPROM/OTPROM not denied
OSCRES — Oscillator Internal Resistor Bit
The OSCRES bit enables a 2-MΩ internal resistor in the oscillator
circuit.
1 = Oscillator internal resistor enabled
0 = Oscillator internal resistor disabled
NOTE:
Program the OSCRES bit to logic 0 in devices using RC oscillators.
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Technical Data
Memory
41
Memory
SWAIT — Stop-to-Wait Conversion Bit
The SWAIT bit enables halt mode. When the SWAIT bit is set, the
CPU interprets the STOP instruction as a WAIT instruction, and the
MCU enters halt mode. Halt mode is the same as wait mode, except
that an oscillator stabilization delay of 1 to 4064 tcyc occurs after
exiting halt mode.
1 = Halt mode enabled
0 = Halt mode not enabled
SWPDI — Software Pulldown Inhibit Bit
The SWPDI bit inhibits software control of the I/O port pulldown
devices. The SWPDI bit overrides the pulldown inhibit bits in the port
pulldown inhibit registers.
1 = Software pulldown control inhibited
0 = Software pulldown control not inhibited
PIRQ — Port A External Interrupt Bit
The PIRQ bit enables the PA0–PA3 pins to function as external
interrupt pins.
1 = PA0–PA3 enabled as external interrupt pins
0 = PA0–PA3 not enabled as external interrupt pins
LEVEL —External Interrupt Sensitivity Bit
The LEVEL bit controls external interrupt triggering sensitivity.
1 = External interrupts triggered by active edges and active levels
0 = External interrupts triggered only by active edges
COPEN — COP Enable Bit
The COPEN bit enables the COP watchdog.
1 = COP watchdog enabled
0 = COP watchdog disabled
Technical Data
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Memory
MOTOROLA
Memory
EPROM Programming Characteristics
2.8 EPROM Programming Characteristics
Characteristic(1)
Symbol
Min
Typ
Max
Unit
Programming voltage
IRQ/VPP
VPP
16.0
16.5
17.0
V
Programming current
IRQ/VPP
IPP
—¦
3.0
10.0
mA
tEPGM
4
4
—
—
—
—
ms
Programming time
Per array byte
MOR
tMPGM
1. V DD = 5.0 Vdc ± 10%, V SS = 0 Vdc, TA = –40°C to +105°C
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Technical Data
Memory
43
Memory
Technical Data
44
MC68HC705J1A — Rev. 4.0
Memory
MOTOROLA
Technical Data — MC68HC705J1A
Section 3. Central Processor Unit (CPU)
3.1 Contents
3.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.3
CPU Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.4
Arithmetic/Logic Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.5
CPU Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.5.1
Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.5.2
Index Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.5.3
Stack Pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.5.4
Program Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
3.5.5
Condition Code Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
3.6
Instruction Set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
3.6.1
Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3.6.1.1
Inherent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
3.6.1.2
Immediate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3.6.1.3
Direct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.6.1.4
Extended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.6.1.5
Indexed, No Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.6.1.6
Indexed, 8-Bit Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.6.1.7
Indexed, 16-Bit Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3.6.1.8
Relative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
3.6.2
Instruction Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
3.6.2.1
Register/Memory Instructions . . . . . . . . . . . . . . . . . . . . . 55
3.6.2.2
Read-Modify-Write Instructions . . . . . . . . . . . . . . . . . . . . 56
3.6.2.3
Jump/Branch Instructions . . . . . . . . . . . . . . . . . . . . . . . .57
3.6.2.4
Bit Manipulation Instructions . . . . . . . . . . . . . . . . . . . . . . 59
3.6.2.5
Control Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
3.7
Instruction Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
3.8
Opcode Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
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Technical Data
Central Processor Unit (CPU)
45
Central Processor Unit (CPU)
3.2 Introduction
The central processor unit (CPU) consists of a CPU control unit, an
arithmetic/logic unit (ALU), and five CPU registers. The CPU control unit
fetches and decodes instructions. The ALU executes the instructions.
The CPU registers contain data, addresses, and status bits that reflect
the results of CPU operations. See Figure 3-1.
Features include:
•
2.1-MHz bus frequency
•
8-bit accumulator
•
8-bit index register
•
11-bit program counter
•
6-bit stack pointer
•
Condition code register (CCR) with five status flags
•
62 instructions
•
Eight addressing modes
•
Power-saving stop, wait, halt, and data-retention modes
3.3 CPU Control Unit
The CPU control unit fetches and decodes instructions during program
operation. The control unit selects the memory locations to read and
write and coordinates the timing of all CPU operations.
3.4 Arithmetic/Logic Unit
The arithmetic/logic unit (ALU) performs the arithmetic, logic, and
manipulation operations decoded from the instruction set by the CPU
control unit. The ALU produces the results called for by the program and
sets or clears status and control bits in the condition code register
(CCR).
Technical Data
46
MC68HC705J1A — Rev. 4.0
Central Processor Unit (CPU)
MOTOROLA
Central Processor Unit (CPU)
Arithmetic/Logic Unit
ARITHMETIC/LOGIC UNIT
CPU CONTROL UNIT
7
6
5
4
3
2
1
0
ACCUMULATOR (A)
7
6
5
4
3
2
1
0
INDEX REGISTER (X)
15 14 13 12 11 10
9
8
7
6
0
0
0
0
1
1
15 14 13 12 11 10
9
8
7
6
0
0
0
0
0
0
0
0
5
4
3
2
1
0
STACK POINTER (SP)
5
4
3
2
1
0
0
PROGRAM COUNTER (PC)
7
6
5
4
3
2
1
0
1
1
1
H
I
N
Z
C
CONDITION CODE REGISTER (CCR)
HALF-CARRY FLAG
INTERRUPT MASK
NEGATIVE FLAG
ZERO FLAG
CARRY/BORROW FLAG
Figure 3-1. Programming Model
MC68HC705J1A — Rev. 4.0
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Technical Data
Central Processor Unit (CPU)
47
Central Processor Unit (CPU)
3.5 CPU Registers
The M68HC05 CPU contains five registers that control and monitor
microcontroller unit (MCU) operation:
•
Accumulator
•
Index register
•
Stack pointer
•
Program counter
•
Condition code register
CPU registers are not memory mapped.
3.5.1 Accumulator
The accumulator (A) is a general-purpose 8-bit register. The CPU uses
the accumulator to hold operands and results of ALU operations.
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Figure 3-2. Accumulator (A)
3.5.2 Index Register
In the indexed addressing (X) modes, the CPU uses the byte in the index
register to determine the conditional address of the operand. The index
register also can serve as a temporary storage location or a counter.
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Figure 3-3. Index Register (X)
Technical Data
48
MC68HC705J1A — Rev. 4.0
Central Processor Unit (CPU)
MOTOROLA
Central Processor Unit (CPU)
CPU Registers
3.5.3 Stack Pointer
The stack pointer (SP) is a 16-bit register that contains the address of
the next location on the stack. During a reset or after the reset stack
pointer instruction (RSP), the stack pointer is preset to $00FF. The
address in the stack pointer decrements after a byte is stacked and
increments before a byte is unstacked.
Read:
Bit
15
14
13
12
11
10
9
8
7
6
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
1
1
5
4
3
2
1
Bit
0
1
1
1
1
1
1
Write:
Reset:
= Unimplemented
Figure 3-4. Stack Pointer (SP)
The 10 most significant bits of the stack pointer are permanently fixed at
0000000011, so the stack pointer produces addresses from $00C0 to
$00FF. If subroutines and interrupts use more than 64 stack locations,
the stack pointer wraps around to address $00FF and begins writing
over the previously stored data. A subroutine uses two stack locations;
an interrupt uses five locations.
MC68HC705J1A — Rev. 4.0
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Technical Data
Central Processor Unit (CPU)
49
Central Processor Unit (CPU)
3.5.4 Program Counter
The program counter (PC) is a 16-bit register that contains the address
of the next instruction or operand to be fetched. The five most significant
bits of the program counter are ignored and appear as 00000.
Normally, the address in the program counter automatically increments
to the next sequential memory location every time an instruction or
operand is fetched. Jump, branch, and interrupt operations load the
program counter with an address other than that of the next sequential
location.
Bit
15
14
13
12
11
0
0
0
0
0
10
9
8
7
6
5
4
3
2
Bit
0
1
Read:
Write:
Reset:
Loaded with vector from $07FE and $07FF
Figure 3-5. Program Counter (PC)
3.5.5 Condition Code Register
The condition code register (CCR) is an 8-bit register whose three most
significant bits are permanently fixed at 111. The condition code register
contains the interrupt mask and four flags that indicate the results of the
instruction just executed.
Read:
Bit 7
6
5
1
1
1
4
3
2
1
Bit 0
H
I
N
Z
C
U
1
U
U
U
Write:
Reset:
1
1
1
= Unimplemented
U = Unaffected
Figure 3-6. Condition Code Register (CCR)
Technical Data
50
MC68HC705J1A — Rev. 4.0
Central Processor Unit (CPU)
MOTOROLA
Central Processor Unit (CPU)
CPU Registers
H — Half-Carry Flag
The CPU sets the half-carry flag when a carry occurs between bits 3
and 4 of the accumulator during an ADD (add without carry) or ADC
(add with carry) operation. The half-carry flag is required for
binary-coded decimal (BCD) arithmetic operations.
I — Interrupt Mask Bit
Setting the interrupt mask disables interrupts. If an interrupt request
occurs while the interrupt mask is logic 0, the CPU saves the CPU
registers on the stack, sets the interrupt mask, and then fetches the
interrupt vector. If an interrupt request occurs while the interrupt mask
is logic 1, the interrupt request is latched. Normally, the CPU
processes the latched interrupt request as soon as the interrupt mask
is cleared again.
A return-from-interrupt instruction (RTI) unstacks the CPU registers,
restoring the interrupt mask to its cleared state. After any reset, the
interrupt mask is set and can be cleared only by a software
instruction.
N — Negative Flag
The CPU sets the negative flag when an ALU operation produces a
negative result.
Z — Zero Flag
The CPU sets the zero flag when an ALU operation produces a result
of $00.
C — Carry/Borrow Flag
The CPU sets the carry/borrow flag when an addition operation
produces a carry out of bit 7 of the accumulator or when a subtraction
operation requires a borrow. Some logical operations and data
manipulation instructions also clear or set the carry/borrow flag.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Central Processor Unit (CPU)
51
Central Processor Unit (CPU)
3.6 Instruction Set
The MCU instruction set has 62 instructions and uses eight addressing
modes.
3.6.1 Addressing Modes
The 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
3.6.1.1 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.
3.6.1.2 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.
Technical Data
52
MC68HC705J1A — Rev. 4.0
Central Processor Unit (CPU)
MOTOROLA
Central Processor Unit (CPU)
Instruction Set
3.6.1.3 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.
3.6.1.4 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 Motorola 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.
3.6.1.5 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 RAM or input/output
(I/O) location.
3.6.1.6 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).
MC68HC705J1A — Rev. 4.0
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Technical Data
Central Processor Unit (CPU)
53
Central Processor Unit (CPU)
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.
3.6.1.7 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 Motorola assembler
determines the shortest form of indexed addressing.
3.6.1.8 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 Motorola 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.
Technical Data
54
MC68HC705J1A — Rev. 4.0
Central Processor Unit (CPU)
MOTOROLA
Central Processor Unit (CPU)
Instruction Set
3.6.2 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
3.6.2.1 Register/Memory Instructions
These instructions operate on 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 3-1. Register/Memory Instructions
Instruction
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
MC68HC705J1A — Rev. 4.0
MOTOROLA
Mnemonic
Technical Data
Central Processor Unit (CPU)
55
Central Processor Unit (CPU)
3.6.2.2 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 instructions on registers with write-only
bits.
Table 3-2. 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.
Technical Data
56
MC68HC705J1A — Rev. 4.0
Central Processor Unit (CPU)
MOTOROLA
Central Processor Unit (CPU)
Instruction Set
3.6.2.3 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.
NOTE:
Do not use BRCLR or BRSET instructions on registers with write-only
bits.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Central Processor Unit (CPU)
57
Central Processor Unit (CPU)
Table 3-3. Jump and Branch Instructions
Instruction
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
Technical Data
58
Mnemonic
MC68HC705J1A — Rev. 4.0
Central Processor Unit (CPU)
MOTOROLA
Central Processor Unit (CPU)
Instruction Set
3.6.2.4 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 3-4. Bit Manipulation Instructions
Instruction
Bit clear
BRCLR
Branch if bit set
BRSET
BSET
Do not use bit manipulation instructions on registers with write-only bits.
MC68HC705J1A — Rev. 4.0
MOTOROLA
BCLR
Branch if bit clear
Bit set
NOTE:
Mnemonic
Technical Data
Central Processor Unit (CPU)
59
Central Processor Unit (CPU)
3.6.2.5 Control Instructions
These instructions act on CPU registers and control CPU operation
during program execution.
Table 3-5. Control Instructions
Instruction
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
Technical Data
60
Mnemonic
MC68HC705J1A — Rev. 4.0
Central Processor Unit (CPU)
MOTOROLA
Central Processor Unit (CPU)
Instruction Set Summary
3.7 Instruction Set Summary
IMM
DIR
EXT
IX2
IX1
IX
ii
A9
2
B9 dd 3
C9 hh ll 4
D9 ee ff 5
E9 ff
4
F9
3
IMM
DIR
EXT
IX2
IX1
IX
AB ii
2
BB dd 3
CB hh ll 4
DB ee ff 5
EB ff
4
FB
3
—
IMM
DIR
EXT
IX2
IX1
IX
ii
A4
2
B4 dd 3
C4 hh ll 4
D4 ee ff 5
E4 ff
4
F4
3
38
48
58
68
78
dd
DIR
INH
INH
IX1
IX
DIR
INH
INH
IX1
IX
37
47
57
67
77
dd
REL
24
rr
3
11
13
15
17
19
1B
1D
1F
dd
dd
dd
dd
dd
dd
dd
dd
5
5
5
5
5
5
5
5
Effect
on CCR
Description
H I N Z C
ADC #opr
ADC opr
ADC opr
ADC opr,X
ADC opr,X
ADC ,X
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
A ← (A) ∧ (M)
Logical AND
Arithmetic Shift Left (Same as LSL)
C
BCC rel
Branch if Carry Bit Clear
—
—
— —
0
b7
Arithmetic Shift Right
A ← (A) + (M)
Add without Carry
ASR opr
ASRA
ASRX
ASR opr,X
ASR ,X
A ← (A) + (M) + (C)
Add with Carry
— —
b0
C
b7
— —
b0
PC ← (PC) + 2 + rel ? C = 0
Mn ← 0
— — — — —
DIR
DIR
DIR
DIR
— — — — —
DIR
DIR
DIR
DIR
(b0)
(b1)
(b2)
(b3)
(b4)
(b5)
(b6)
(b7)
ff
ff
Cycles
Opcode
Operation
Address
Mode
Source
Form
Operand
Table 3-6. Instruction Set Summary (Sheet 1 of 6)
5
3
3
6
5
5
3
3
6
5
BCLR n opr
Clear Bit n
BCS rel
Branch if Carry Bit Set (Same as BLO)
PC ← (PC) + 2 + rel ? C = 1
— — — — —
REL
25
rr
3
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
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Central Processor Unit (CPU)
61
Central Processor Unit (CPU)
Branch if Higher
BHS rel
Branch if Higher or Same
BIH rel
BIL rel
Cycles
BHI rel
H I N Z C
Operand
Operation
Opcode
Source
Form
Address
Mode
Table 3-6. Instruction Set Summary (Sheet 2 of 6)
PC ← (PC) + 2 + rel ? C ∨ Z = 0 — — — — —
REL
22
rr
3
Description
Effect
on CCR
PC ← (PC) + 2 + rel ? C = 0
— — — — —
REL
24
rr
3
Branch if IRQ Pin High
PC ← (PC) + 2 + rel ? IRQ = 1
— — — — —
REL
2F
rr
3
Branch if IRQ Pin Low
PC ← (PC) + 2 + rel ? IRQ = 0
— — — — —
REL
2E
rr
3
—
IMM
DIR
EXT
IX2
IX1
IX
ii
A5
2
B5 dd 3
C5 hh ll 4
D5 ee ff 5
E5 ff
4
F5
3
— — — — —
REL
25
rr
3
PC ← (PC) + 2 + rel ? C ∨ Z = 1 — — — — —
REL
23
rr
3
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
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
21
rr
3
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
(A) ∧ (M)
PC ← (PC) + 2 + rel ? C = 1
PC ← (PC) + 2 + rel ? Mn = 0
PC ← (PC) + 2 + rel ? 1 = 0
PC ← (PC) + 2 + rel ? Mn = 1
Mn ← 1
Technical Data
62
— —
— — — —
— — — — —
DIR
DIR
DIR
DIR
DIR
DIR
DIR
DIR
(b0)
(b1)
(b2)
(b3)
(b4)
(b5)
(b6)
(b7)
REL
DIR
DIR
DIR
DIR
DIR
DIR
DIR
DIR
(b0)
(b1)
(b2)
(b3)
(b4)
(b5)
(b6)
(b7)
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
DIR
DIR
DIR
DIR
— — — — —
DIR
DIR
DIR
DIR
(b0)
(b1)
(b2)
(b3)
(b4)
(b5)
(b6)
(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
— — — —
MC68HC705J1A — Rev. 4.0
Central Processor Unit (CPU)
MOTOROLA
Central Processor Unit (CPU)
Instruction Set Summary
H I N Z C
Operand
Cycles
Operation
Opcode
Source
Form
Address
Mode
Table 3-6. Instruction Set Summary (Sheet 3 of 6)
PC ← (PC) + 2; push (PCL)
SP ← (SP) – 1; push (PCH)
SP ← (SP) – 1
PC ← (PC) + rel
— — — — —
REL
AD
rr
6
Description
Effect
on CCR
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
— — 0 1 —
DIR
INH
INH
IX1
IX
3F
4F
5F
6F
7F
IMM
DIR
EXT
IX2
IX1
IX
ii
A1
2
B1 dd 3
C1 hh ll 4
D1 ee ff 5
E1 ff
4
F1
3
DIR
INH
INH
IX1
IX
33
43
53
63
73
IMM
DIR
EXT
IX2
IX1
IX
ii
A3
2
B3 dd 3
C3 hh ll 4
D3 ee ff 5
E3 ff
4
F3
3
DIR
INH
INH
IX1
IX
3A
4A
5A
6A
7A
—
IMM
DIR
EXT
IX2
IX1
IX
ii
A8
2
B8 dd 3
C8 hh ll 4
D8 ee ff 5
E8 ff
4
F8
3
—
DIR
INH
INH
IX1
IX
3C
4C
5C
6C
7C
CLR opr
CLRA
CLRX
CLR opr,X
CLR ,X
CMP
CMP
CMP
CMP
CMP
CMP
#opr
opr
opr
opr,X
opr,X
,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
M ← $00
A ← $00
X ← $00
M ← $00
M ← $00
Clear Byte
Compare Accumulator with Memory Byte
(A) – (M)
M ← (M) = $FF – (M)
A ← (A) = $FF – (A)
Complement Byte (One’s Complement)
X ← (X) = $FF – (X)
— —
1
M ← (M) = $FF – (M)
M ← (M) = $FF – (M)
Compare Index Register with Memory Byte
M
A
X
M
M
Decrement Byte
EXCLUSIVE OR Accumulator with Memory Byte
Increment Byte
(X) – (M)
← (M) – 1
← (A) – 1
← (X) – 1
← (M) – 1
← (M) – 1
A ← (A) ⊕ (M)
M ← (M) + 1
A ← (A) + 1
X ← (X) + 1
M ← (M) + 1
M ← (M) + 1
MC68HC705J1A — Rev. 4.0
MOTOROLA
— —
— —
— —
— —
— —
—
dd
ff
dd
ff
dd
ff
dd
ff
5
3
3
6
5
5
3
3
6
5
5
3
3
6
5
5
3
3
6
5
Technical Data
Central Processor Unit (CPU)
63
Central Processor Unit (CPU)
JMP
JMP
JMP
JMP
JMP
opr
opr
opr,X
opr,X
,X
JSR opr
JSR opr
JSR opr,X
JSR opr,X
JSR ,X
LDA
LDA
LDA
LDA
LDA
LDA
#opr
opr
opr
opr,X
opr,X
,X
LDX
LDX
LDX
LDX
LDX
LDX
#opr
opr
opr
opr,X
opr,X
,X
LSL opr
LSLA
LSLX
LSL opr,X
LSL ,X
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
A ← (M)
Load Accumulator with Memory Byte
0
b7
Logical Shift Right
MUL
Unsigned Multiply
NEG opr
NEGA
NEGX
NEG opr,X
NEG ,X
Negate Byte (Two’s Complement)
NOP
No Operation
C
BD dd 5
CD hh ll 6
DD ee ff 7
ED ff
6
FD
5
—
IMM
DIR
EXT
IX2
IX1
IX
ii
A6
2
B6 dd 3
C6 hh ll 4
D6 ee ff 5
E6 ff
4
F6
3
—
IMM
DIR
EXT
IX2
IX1
IX
AE ii
2
BE dd 3
CE hh ll 4
DE ee ff 5
EE ff
4
FE
3
38
48
58
68
78
dd
DIR
INH
INH
IX1
IX
DIR
INH
INH
IX1
IX
34
44
54
64
74
dd
0 — — — 0
INH
42
DIR
INH
INH
IX1
IX
30
40
50
60
70
INH
9D
IMM
DIR
EXT
IX2
IX1
IX
AA ii
2
BA dd 3
CA hh ll 4
DA ee ff 5
EA ff
4
FA
3
— —
— — 0
b0
X : A ← (X) × (A)
M ← –(M) = $00 – (M)
A ← –(A) = $00 – (A)
X ← –(X) = $00 – (X)
M ← –(M) = $00 – (M)
M ← –(M) = $00 – (M)
— —
— — — — —
Logical OR Accumulator with Memory
A ← (A) ∨ (M)
Technical Data
64
— — — — —
DIR
EXT
IX2
IX1
IX
b0
0
b7
BC dd 2
CC hh ll 3
DC ee ff 4
EC ff
3
FC
2
— —
C
Logical Shift Left (Same as ASL)
— — — — —
DIR
EXT
IX2
IX1
IX
— —
X ← (M)
Load Index Register with Memory Byte
Cycles
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
Description
Operand
Operation
Effect
on CCR
Opcode
Source
Form
Address
Mode
Table 3-6. Instruction Set Summary (Sheet 4 of 6)
— —
—
ff
ff
5
3
3
6
5
5
3
3
6
5
11
dd
ff
5
3
3
6
5
2
MC68HC705J1A — Rev. 4.0
Central Processor Unit (CPU)
MOTOROLA
Central Processor Unit (CPU)
Instruction Set Summary
H I N Z C
C
Rotate Byte Left through Carry Bit
— —
b7
b0
DIR
INH
INH
IX1
IX
39
49
59
69
79
dd
DIR
INH
INH
IX1
IX
36
46
56
66
76
dd
ff
Cycles
Description
Operand
ROL opr
ROLA
ROLX
ROL opr,X
ROL ,X
Operation
Effect
on CCR
Opcode
Source
Form
Address
Mode
Table 3-6. Instruction Set Summary (Sheet 5 of 6)
5
3
3
6
5
5
3
3
6
5
ROR opr
RORA
RORX
ROR opr,X
ROR ,X
Rotate Byte Right through Carry Bit
RSP
Reset Stack Pointer
SP ← $00FF
— — — — —
INH
9C
2
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)
INH
80
9
RTS
Return from Subroutine
SP ← (SP) + 1; Pull (PCH)
SP ← (SP) + 1; Pull (PCL)
— — — — —
INH
81
6
IMM
DIR
EXT
IX2
IX1
IX
ii
A2
2
B2 dd 3
C2 hh ll 4
D2 ee ff 5
E2 ff
4
F2
3
C
b7
— —
b0
ff
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
2
SEI
Set Interrupt Mask
I←1
— 1 — — —
INH
9B
2
—
DIR
EXT
IX2
IX1
IX
B7 dd 4
C7 hh ll 5
D7 ee ff 6
E7 ff
5
F7
4
— 0 — — —
INH
8E
—
DIR
EXT
IX2
IX1
IX
BF dd 4
CF hh ll 5
DF ee ff 6
EF ff
5
FF
4
IMM
DIR
EXT
IX2
IX1
IX
ii
A0
2
B0 dd 3
C0 hh ll 4
D0 ee ff 5
E0 ff
4
F0
3
STA opr
STA opr
STA opr,X
STA opr,X
STA ,X
Store Accumulator in Memory
STOP
Stop Oscillator and Enable IRQ Pin
STX
STX
STX
STX
STX
opr
opr
opr,X
opr,X
,X
SUB #opr
SUB opr
SUB opr
SUB opr,X
SUB opr,X
SUB ,X
A ← (A) – (M) – (C)
M ← (A)
M ← (X)
Store Index Register In Memory
Subtract Memory Byte from Accumulator
A ← (A) – (M)
MC68HC705J1A — Rev. 4.0
MOTOROLA
— —
— —
— —
— —
2
Technical Data
Central Processor Unit (CPU)
65
Central Processor Unit (CPU)
H I N Z C
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
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
TXA
Transfer Index Register to Accumulator
WAIT
Stop CPU Clock and Enable Interrupts
A
C
CCR
dd
dd rr
DIR
ee ff
EXT
ff
H
hh ll
I
ii
IMM
INH
IX
IX1
IX2
M
N
n
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
X ← (A)
(M) – $00
A ← (X)
— — — — —
— —
—
—
— — — — —
—
opr
PC
PCH
PCL
REL
rel
rr
SP
X
Z
#
∧
∨
⊕
()
–( )
←
?
:
— — —
INH
83
10
INH
97
2
DIR
INH
INH
IX1
IX
3D
4D
5D
6D
7D
INH
9F
2
INH
8F
2
dd
ff
Cycles
Description
Opcode
Operation
Effect
on CCR
Address
Mode
Source
Form
Operand
Table 3-6. Instruction Set Summary (Sheet 6 of 6)
4
3
3
5
4
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
3.8 Opcode Map
See Table 3-7.
Technical Data
66
MC68HC705J1A — Rev. 4.0
Central Processor Unit (CPU)
MOTOROLA
MC68HC705J1A — Rev. 4.0
MOTOROLA
Table 3-7. Opcode Map
Bit Manipulation
MSB
LSB
0
1
2
3
4
Central Processor Unit (CPU)
5
6
7
8
9
A
B
C
E
F
Read-Modify-Write
Control
Register/Memory
DIR
REL
DIR
INH
INH
IX1
IX
INH
INH
IMM
DIR
EXT
IX2
IX1
IX
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
67
Technical Data
5
BRSET0
3
DIR
5
BRCLR0
3
DIR
5
BRSET1
3
DIR
5
BRCLR1
3
DIR
5
BRSET2
3
DIR
5
BRCLR2
3
DIR
5
BRSET3
3
DIR
5
BRCLR3
3
DIR
5
BRSET4
3
DIR
5
BRCLR4
3
DIR
5
BRSET5
3
DIR
5
BRCLR5
3
DIR
5
BRSET6
3
DIR
5
BRCLR6
3
DIR
5
BRSET7
3
DIR
5
BRCLR7
3
DIR
5
BSET0
DIR
5
BCLR0
2
DIR
5
BSET1
2
DIR
5
BCLR1
2
DIR
5
BSET2
2
DIR
5
BCLR2
2
DIR
5
BSET3
2
DIR
5
BCLR3
2
DIR
5
BSET4
2
DIR
5
BCLR4
2
DIR
5
BSET5
2
DIR
5
BCLR5
2
DIR
5
BSET6
2
DIR
5
BCLR6
2
DIR
5
BSET7
2
DIR
5
BCLR7
2
DIR
2
INH = Inherent
IMM = Immediate
DIR = Direct
EXT = Extended
5
3
NEG
BRA
DIR
REL 2
3
BRN
2
REL
3
BHI
2
REL
5
3
COM
BLS
DIR
2
REL 2
5
3
LSR
BCC
DIR
2
REL 2
3
BCS/BLO
2
REL
5
3
ROR
BNE
DIR
2
REL 2
5
3
ASR
BEQ
DIR
2
REL 2
5
3
ASL/LSL
BHCC
DIR
2
REL 2
5
3
ROL
BHCS
DIR
2
REL 2
5
3
DEC
BPL
DIR
2
REL 2
3
BMI
2
REL
5
3
INC
BMC
DIR
2
REL 2
4
3
TST
BMS
DIR
2
REL 2
3
BIL
2
REL
5
3
CLR
BIH
DIR
2
REL 2
2
1
9
RTI
INH
6
RTS
1
INH
5
6
3
3
NEG
NEG
NEGX
NEGA
IX 1
IX1 1
INH 2
INH 1
2
2
11
MUL
1
INH
10
5
6
3
3
SWI
COM
COM
COMX
COMA
INH
IX 1
IX1 1
INH 2
1
INH 1
5
6
3
3
LSR
LSR
LSRX
LSRA
IX
IX1 1
INH 2
1
INH 1
2
2
2
2
6
3
3
ROR
RORX
RORA
IX1
INH 2
1
INH 1
6
3
3
ASR
ASRX
ASRA
IX1
INH 2
1
INH 1
6
3
3
ASLA/LSLA ASLX/LSLX ASL/LSL
IX1
INH 2
1
INH 1
6
3
3
ROL
ROLX
ROLA
IX1
INH 2
1
INH 1
6
3
3
DEC
DECX
DECA
IX1
INH 2
1
INH 1
5
ROR
1
2
IX
5
ASR
1
IX
5
ASL/LSL
1
IX
5
ROL
1
IX
5
DEC
1
IX
1
1
1
1
1
5
6
3
3
INC
INC
INCX
INCA
IX
IX1 1
INH 2
INH 1
4
5
3
3
TST
TST
TSTX
TSTA
IX
IX1 1
INH 2
1
INH 1
1
1
1
2
TAX
INH
2
CLC
INH
2
SEC
INH
2
CLI
INH
2
SEI
INH
2
RSP
INH
2
NOP
INH
2
STOP
1
INH
2
2
5
6
3
3
TXA
WAIT
CLR
CLR
CLRX
CLRA
INH
INH 1
IX 1
IX1 1
INH 2
1
INH 1
REL = Relative
IX = Indexed, No Offset
IX1 = Indexed, 8-Bit Offset
IX2 = Indexed, 16-Bit Offset
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
2
IMM 2
2
ORA
2
IMM 2
2
ADD
2
IMM 2
2
2
6
BSR
2
REL 2
2
LDX
2
IMM 2
2
MSB
LSB
LSB of Opcode in Hexadecimal
0
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
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
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
4
SUB
IX1
4
CMP
IX1
4
SBC
IX1
4
CPX
IX1
4
AND
IX1
4
BIT
IX1
4
LDA
IX1
5
STA
IX1
4
EOR
IX1
4
ADC
IX1
4
ORA
IX1
4
ADD
IX1
3
JMP
IX1
6
JSR
IX1
4
LDX
IX1
5
STX
IX1
MSB
LSB
3
SUB
1
1
CMP
1
IX
3
2
SBC
1
IX
3
3
CPX
1
IX
3
4
AND
1
IX
3
5
BIT
1
IX
3
LDA
1
6
IX
4
7
STA
1
IX
3
8
EOR
1
IX
3
9
ADC
1
IX
3
A
ORA
1
IX
3
B
ADD
1
IX
2
JMP
1
C
IX
5
D
JSR
1
IX
3
E
LDX
1
IX
4
F
STX
1
MSB of Opcode in Hexadecimal
5 Number of Cycles
BRSET0 Opcode Mnemonic
3
DIR Number of Bytes/Addressing Mode
0
IX
3
IX
Central Processor Unit (CPU)
Opcode Map
D
Branch
DIR
Central Processor Unit (CPU)
Technical Data
68
MC68HC705J1A — Rev. 4.0
Central Processor Unit (CPU)
MOTOROLA
Technical Data — MC68HC705J1A
Section 4. Resets and Interrupts
4.1 Contents
4.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
4.3
Resets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4.3.1
Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
4.3.2
External Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.3.3
COP Watchdog Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.3.4
Illegal Address Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
4.4
Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.4.1
Software Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.4.2
External Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
4.4.3
Timer Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.4.3.1
Real-Time Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.4.3.2
Timer Overflow Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.4.4
Interrupt Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.2 Introduction
Reset initializes the microcontroller unit (MCU) by returning the program
counter to a known address and by forcing control and status bits to
known states.
Interrupts temporarily change the sequence of program execution to
respond to events that occur during processing.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Resets and Interrupts
69
Resets and Interrupts
4.3 Resets
A reset immediately stops the operation of the instruction being
executed, initializes certain control and status bits, and loads the
program counter with a user-defined reset vector address. These
sources can generate a reset:
•
Power-on reset (POR) circuit
•
RESET pin
•
Computer operating properly (COP) watchdog
•
Illegal address
ILLEGAL ADDRESS
COP WATCHDOG
VDD
POWER-ON RESET
S
D
RESET PIN
INTERNAL CLOCK
Q
RST
TO CPU AND
PERIPHERAL
MODULES
CK
RESET
LATCH
Figure 4-1. Reset Sources
Technical Data
70
MC68HC705J1A — Rev. 4.0
Resets and Interrupts
MOTOROLA
Resets and Interrupts
Resets
4.3.1 Power-On Reset
A positive transition on the VDD pin generates a power-on reset.
NOTE:
The power-on reset is strictly for power-up conditions and cannot be
used to detect drops in power supply voltage.
A 4064-tcyc (internal clock cycle) delay after the oscillator becomes
active allows the clock generator to stabilize. If any reset source is active
at the end of this delay, the MCU remains in the reset condition until all
reset sources are inactive.
VDD
OSCILLATOR STABILIZATION DELAY
(NOTE 1)
OSC1 PIN
INTERNAL
CLOCK
INTERNAL
ADDRESS BUS
$07FE
$07FE
$07FE
$07FE
$07FE
INTERNAL
DATA BUS
$07FE
NEW PCH
$07FF
NEW PCL
Notes:
1. Power-on reset threshold is typically between 1 V and 2 V.
2. Internal clock, internal address bus, and internal data bus are not available externally.
Figure 4-2. Power-On Reset Timing
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Resets and Interrupts
71
Resets and Interrupts
4.3.2 External Reset
A logic 0 applied to the RESET pin for 1 1/2 tcyc generates an external
reset. A Schmitt trigger senses the logic level at the RESET pin.
INTERNAL
CLOCK
INTERNAL
ADDRESS BUS
$07FE
$07FE
$07FE
$07FE
NEW
PCH
INTERNAL
DATA BUS
$07FF
NEW PC
NEW
PCL
NEW PC
OP
CODE
DUMMY
tRL
RESET
Notes:
1. Internal clock, internal address bus, and internal data bus are not available externally.
2. The next rising edge of the internal clock after the rising edge of RESET initiates the reset sequence.
Figure 4-3. External Reset Timing
Table 4-1. External Reset Timing
Characteristic
RESET pulse width
Symbol
Min
Max
Unit
tRL
1.5
—
tcyc
4.3.3 COP Watchdog Reset
A timeout of the COP watchdog generates a COP reset. The COP
watchdog is part of a software error detection system and must be
cleared periodically to start a new timeout period. To clear the COP
watchdog and prevent a COP reset, write a logic 0 to bit 0 (COPC) of the
COP register at location $07F0.
4.3.4 Illegal Address Reset
An opcode fetch from an address not in random-access memory (RAM)
or erasable, programmable read-only memory (EPROM) generates a
reset.
Technical Data
72
MC68HC705J1A — Rev. 4.0
Resets and Interrupts
MOTOROLA
Resets and Interrupts
Interrupts
4.4 Interrupts
These sources can generate interrupts:
•
Software interrupt (SWI) instruction
•
External interrupt pins:
– IRQ/VPP
– PA0–PA3
•
Timer:
– Real-time interrupt flag (RTIF)
– Timer overflow flag (TOF)
An interrupt temporarily stops the program sequence to process a
particular event. An interrupt does not stop the operation of the
instruction being executed, but takes effect when the current instruction
completes its execution. Interrupt processing automatically saves the
CPU registers on the stack and loads the program counter with a
user-defined interrupt vector address.
4.4.1 Software Interrupt
The software interrupt (SWI) instruction causes a non-maskable
interrupt.
4.4.2 External Interrupt
An interrupt signal on the IRQ/VPP pin latches an external interrupt
request. When the CPU completes its current instruction, it tests the IRQ
latch. If the IRQ latch is set, the CPU then tests the I bit in the condition
code register. If the I bit is clear, the CPU then begins the interrupt
sequence.
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Technical Data
Resets and Interrupts
73
Resets and Interrupts
The CPU clears the IRQ latch during interrupt processing, so that
another interrupt signal on the IRQ/VPP pin can latch another interrupt
request during the interrupt service routine. As soon as the I bit is cleared
during the return from interrupt, the CPU can recognize the new interrupt
request. Figure 4-4 shows the IRQ/VPP pin interrupt logic.
TO BIH & BIL
INSTRUCTION
PROCESSING
IRQ
LEVEL-SENSITIVE TRIGGER
(MOR LEVEL BIT)
IRQF
VDD
EXTERNAL
INTERRUPT
REQUEST
D IRQ Q
LATCH
CK
PA3
PA2
PA1
PA0
IRQE
CLR
PIRQ
(MOR)
RESET
IRQ VECTOR FETCH
IRQR
Figure 4-4. External Interrupt Logic
Setting the I bit in the condition code register disables external interrupts.
The port A external interrupt bit (PIRQ) in the mask option register
enables pins PA0–PA3 to function as external interrupt pins.
The external interrupt sensitivity bit (LEVEL) in the mask option register
controls interrupt triggering sensitivity of external interrupt pins. The
IRQ/VPP pin can be negative-edge triggered only or negative-edge and
low-level triggered. Port A external interrupt pins can be positive-edge
triggered only or both positive-edge and high-level triggered. The
level-sensitive triggering option allows multiple external interrupt
sources to be wire-ORed to an external interrupt pin. An external
interrupt request, shown in Figure 4-5, is latched as long as any source
is holding an external interrupt pin low.
Technical Data
74
MC68HC705J1A — Rev. 4.0
Resets and Interrupts
MOTOROLA
Resets and Interrupts
Interrupts
tILIL
IRQ PIN
IRQ1
.
tILIH
tILIH
.
.
IRQn
IRQ (INTERNAL)
Figure 4-5. External Interrupt Timing
Table 4-2. External Interrupt Timing (VDD = 5.0 Vdc)(1)
Characteristic
Symbol
Min
Max
Unit
Interrupt pulse width low (edge-triggered)
tILIH
125
—
ns
Interrupt pulse period
tILIL
Note(2)
—
tcyc
1. V DD = 5.0 Vdc ±10%, VSS = 0 Vdc, TA = –40°C to +105°C, unless otherwise noted
2. The minimum, tILIL, should not be less than the number of interrupt service routine cycles
plus 19 tcyc.
Table 4-3. External Interrupt Timing (VDD = 3.3 Vdc)(1)
Characteristic
Symbol
Min
Max
Unit
Interrupt pulse width low (edge-triggered)
tILIH
250
—
ns
Interrupt pulse period
tILIL
Note(2)
—
tcyc
1. V DD = 3.3 Vdc ±10%, VSS = 0 Vdc, TA = –40°C to +105°C, unless otherwise noted
2. The minimum, tILIL, should not be less than the number of interrupt service routine cycles
plus 19 tcyc.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Resets and Interrupts
75
Resets and Interrupts
4.4.3 Timer Interrupts
The timer can generate these interrupt requests:
•
Real time
•
Timer overflow
Setting the I bit in the condition code register disables timer interrupts.
4.4.3.1 Real-Time Interrupt
A real-time interrupt occurs if the real-time interrupt flag, RTIF, becomes
set while the real-time interrupt enable bit, RTIE, is also set. RTIF and
RTIE are in the timer status and control register.
4.4.3.2 Timer Overflow Interrupt
A timer overflow interrupt request occurs if the timer overflow flag, TOF,
becomes set while the timer overflow interrupt enable bit, TOIE, is also
set. TOF and TOIE are in the timer status and control register.
4.4.4 Interrupt Processing
The CPU takes these actions to begin servicing an interrupt:
•
Stores the CPU registers on the stack in the order shown in
Figure 4-6
•
Sets the I bit in the condition code register to prevent further
interrupts
•
Loads the program counter with the contents of the appropriate
interrupt vector locations:
– $07FC and $07FD (software interrupt vector)
– $07FA and $07FB (external interrupt vector)
– $07F8 and $07F9 (timer interrupt vector)
The return-from-interrupt (RTI) instruction causes the CPU to recover
the CPU registers from the stack as shown in Figure 4-6.
Technical Data
76
MC68HC705J1A — Rev. 4.0
Resets and Interrupts
MOTOROLA
Resets and Interrupts
Interrupts
$00C0 (BOTTOM OF STACK)
$00C1
$00C2
UNSTACKING
ORDER
•
•
•
•
•
•
5
1
4
2
ACCUMULATOR
3
3
INDEX REGISTER
2
4
PROGRAM COUNTER (HIGH BYTE)
1
5
PROGRAM COUNTER (LOW BYTE)
CONDITION CODE REGISTER
STACKING
ORDER
•
•
•
•
•
•
$00FD
$00FE
$00FF (TOP OF STACK)
Figure 4-6. Interrupt Stacking Order
Table 4-4. Reset/Interrupt Vector Addresses
Function
Source
Local
Mask
Global
Mask
Priority
(1 = Highest)
Vector
Address
Reset
Power-on
RESET pin
COP
watchdog(1)
illegal address
None
None
1
$07FE–$07FF
Software
interrupt
(SWI)
User code
None
None
Same priority
as instruction
$07FC–$07FD
External
interrupt
IRQ/VPP pin
IRQE
I bit
2
$07FA–$07FB
Timer
interrupts
RTIF bit
TOF bit
RTIE bit
TOIE bit
I bit
3
$07F8–$07F9
1. The COP watchdog is programmable in the mask option register.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Resets and Interrupts
77
Resets and Interrupts
FROM RESET
YES
I BIT SET?
NO
EXTERNAL
INTERRUPT?
YES
CLEAR IRQ LATCH
NO
TIMER
INTERRUPT?
YES
STACK PC, X, A, CCR
SET I BIT
LOAD PC WITH INTERRUPT VECTOR
NO
FETCH NEXT
INSTRUCTION
SWI
INSTRUCTION?
YES
NO
RTI
INSTRUCTION?
YES
NO
UNSTACK CCR, A, X, PC
EXECUTE INSTRUCTION
Figure 4-7. Interrupt Flowchart
Technical Data
78
MC68HC705J1A — Rev. 4.0
Resets and Interrupts
MOTOROLA
Technical Data — MC68HC705J1A
Section 5. Low-Power Modes
5.1 Contents
5.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
5.3
Exiting Stop and Wait Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 80
5.4
Effects of Stop and Wait Modes . . . . . . . . . . . . . . . . . . . . . . . .81
5.4.1
Clock Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
5.4.2
CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
5.4.3
COP Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
5.4.4
Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
5.4.5
EPROM/OTPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
5.4.6
Data-Retention Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
5.5
Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
5.2 Introduction
The microcontroller unit (MCU) can enter these low-power standby
modes:
•
Stop mode — The STOP instruction puts the MCU in its lowest
power-consumption mode.
•
Wait mode — The WAIT instruction puts the MCU in an
intermediate power-consumption mode.
•
Halt mode — Halt mode is identical to wait mode, except that an
oscillator stabilization delay of 1 to 4064 internal clock cycles
occurs when the MCU exits halt mode. The stop-to-wait
conversion bit, SWAIT, in the mask option register, enables halt
mode.
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Technical Data
Low-Power Modes
79
Low-Power Modes
Enabling halt mode prevents the computer operating properly
(COP) watchdog from being inadvertently turned off by a STOP
instruction.
•
Data-retention mode — In data-retention mode, the MCU retains
RAM contents and CPU register contents at VDD voltages as low
as 2.0 Vdc. The data-retention feature allows the MCU to remain
in a low power-consumption state during which it retains data, but
the CPU cannot execute instructions.
5.3 Exiting Stop and Wait Modes
The events described in this subsection bring the MCU out of stop mode
and load the program counter with the reset vector or with an interrupt
vector.
Exiting stop mode:
•
External reset — A logic 0 on the RESET pin resets the MCU,
starts the CPU clock, and loads the program counter with the
contents of locations $07FE and $07FF.
•
External interrupt — A high-to-low transition on the IRQ/VPP pin or
a low-to-high transition on an enabled port A external interrupt pin
starts the CPU clock and loads the program counter with the
contents of locations $07FA and $07FB.
Exiting wait mode:
•
External reset — A logic 0 on the RESET pin resets the MCU,
starts the CPU clock, and loads the program counter with the
contents of locations $07FE and $07FF.
•
External interrupt — A high-to-low transition on the IRQ/VPP pin or
a low-to-high transition on an enabled port A external interrupt pin
starts the CPU clock and loads the program counter with the
contents of locations $07FA and $07FB.
Technical Data
80
MC68HC705J1A — Rev. 4.0
Low-Power Modes
MOTOROLA
Low-Power Modes
Effects of Stop and Wait Modes
•
COP watchdog reset — A timeout of the COP watchdog resets the
MCU, starts the CPU clock, and loads the program counter with
the contents of locations $07FE and $07FF. Software can enable
timer interrupts so that the MCU periodically can exit wait mode to
reset the COP watchdog.
•
Timer interrupt — Real-time interrupt requests and timer overflow
interrupt requests start the MCU clock and load the program
counter with the contents of locations $07F8 and $07F9.
5.4 Effects of Stop and Wait Modes
The STOP and WAIT instructions have the effects described in this
subsection on MCU modules.
5.4.1 Clock Generation
The STOP instruction:
The STOP instruction disables the internal oscillator, stopping the
CPU clock and all peripheral clocks.
After exiting stop mode, the CPU clock and all enabled peripheral
clocks begin running after the oscillator stabilization delay.
NOTE:
The oscillator stabilization delay holds the MCU in reset for the first 4064
internal clock cycles.
The WAIT instruction:
The WAIT instruction disables the CPU clock.
After exiting wait mode, the CPU clock and all enabled peripheral
clocks immediately begin running.
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Technical Data
Low-Power Modes
81
Low-Power Modes
5.4.2 CPU
The STOP instruction:
•
Clears the interrupt mask (I bit) in the condition code register,
enabling external interrupts
•
Disables the CPU clock
After exiting stop mode, the CPU clock begins running after the
oscillator stabilization delay.
After exit from stop mode by external interrupt, the I bit remains clear.
After exit from stop mode by reset, the I bit is set.
The WAIT instruction:
•
Clears the interrupt mask (I bit) in the condition code register,
enabling interrupts
•
Disables the CPU clock
After exit from wait mode by interrupt, the I bit remains clear.
After exit from wait mode by reset, the I bit is set.
5.4.3 COP Watchdog
The STOP instruction:
NOTE:
•
Clears the COP watchdog counter
•
Disables the COP watchdog clock
To prevent the STOP instruction from disabling the COP watchdog,
program the stop-to-wait conversion bit (SWAIT) in the mask option
register to logic 1.
After exit from stop mode by external interrupt, the COP watchdog
counter immediately begins counting from $0000 and continues
counting throughout the oscillator stabilization delay.
NOTE:
Immediately after exiting stop mode by external interrupt, service the
COP to ensure a full COP timeout period.
Technical Data
82
MC68HC705J1A — Rev. 4.0
Low-Power Modes
MOTOROLA
Low-Power Modes
Effects of Stop and Wait Modes
After exit from stop mode by reset:
•
The COP watchdog counter immediately begins counting from
$0000.
•
The COP watchdog counter is cleared at the end of the oscillator
stabilization delay and begins counting from $0000 again.
The WAIT instruction:
The WAIT instruction has no effect on the COP watchdog.
NOTE:
To prevent a COP timeout during wait mode, exit wait mode periodically
to service the COP.
5.4.4 Timer
The STOP instruction:
•
Clears the RTIE, TOFE, RTIF, and TOF bits in the timer status and
control register, disabling timer interrupt requests and removing
any pending timer interrupt requests
•
Disables the clock to the timer
After exiting stop mode by external interrupt, the timer immediately
resumes counting from the last value before the STOP instruction and
continues counting throughout the oscillator stabilization delay.
After exiting stop mode by reset and after the oscillator stabilization
delay, the timer resumes operation from its reset state.
The WAIT instruction:
The WAIT instruction has no effect on the timer.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Low-Power Modes
83
Low-Power Modes
5.4.5 EPROM/OTPROM
The STOP instruction:
The STOP instruction during erasable, programmable read-only
memory (EPROM) programming clears the EPGM bit in the EPROM
programming register, removing the programming voltage from the
EPROM.
The WAIT instruction:
The WAIT instruction has no effect on EPROM/one-time
programmable read-only memory (OTPROM) operation.
5.4.6 Data-Retention Mode
In data-retention mode, the MCU retains random-access memory (RAM)
contents and CPU register contents at VDD voltages as low as 2.0 Vdc.
The data-retention feature allows the MCU to remain in a low
power-consumption state during which it retains data, but the CPU
cannot execute instructions.
To put the MCU in data-retention mode:
1. Drive the RESET pin to logic 0.
2. Lower the VDD voltage. The RESET pin must remain low
continuously during data-retention mode.
To take the MCU out of data-retention mode:
1. Return VDD to normal operating voltage.
2. Return the RESET pin to logic 1.
Technical Data
84
MC68HC705J1A — Rev. 4.0
Low-Power Modes
MOTOROLA
Low-Power Modes
Timing
5.5 Timing
OSC
(NOTE 1)
tRL
RESET
IRQ/VPP
(NOTE 2)
tILIH
OSCILLATOR STABILIZATION DELAY
IRQ/VPP
(NOTE 3)
INTERNAL
CLOCK
INTERNAL
ADDRESS
BUS
$07FE
(NOTE 4)
$07FE
$07FE
Notes:
1. Internal clocking from OSC1 pin
2. Edge-triggered external interrupt mask option
3. Edge- and level-triggered external interrupt mask option
4. Reset vector shown as example
$07FE
$07FE
$07FF
RESET OR INTERRUPT
VECTOR FETCH
Figure 5-1. Stop Mode Recovery Timing
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Low-Power Modes
85
Low-Power Modes
STOP
SWAIT
BIT SET?
YES
HALT
WAIT
CLEAR I BIT IN CCR
SET IRQE BIT IN ISCR
TURN OFF CPU CLOCK
TIMER CLOCK ACTIVE
CLEAR I BIT IN CCR
SET IRQE BIT IN ISCR
TURN OFF CPU CLOCK
TIMER CLOCK ACTIVE
NO
CLEAR I BIT IN CCR
SET IRQE BIT IN ISCR
CLEAR TOF, RTIF, TOIE, AND RTIE BITS IN TSCR
TURN OFF INTERNAL OSCILLATOR
YES
EXTERNAL
RESET?
YES
EXTERNAL
RESET?
YES
NO
EXTERNAL
RESET?
NO
NO
YES
EXTERNAL
INTERRUPT?
YES
EXTERNAL
INTERRUPT?
YES
NO
EXTERNAL
INTERRUPT?
NO
NO
YES
TIMER
INTERRUPT?
TURN ON INTERNAL OSCILLATOR
RESET STABILIZATION TIMER
YES
COP
RESET?
NO
TIMER
INTERRUPT?
NO
NO
YES
END OF
STABILIZATION
DELAY?
YES
YES
COP
RESET?
NO
NO
TURN ON CPU CLOCK
1. LOAD PC WITH RESET VECTOR
OR
2. SERVICE INTERRUPT
a. SAVE CPU REGISTERS ON STACK
b. SET I BIT IN CCR
c. LOAD PC WITH INTERRUPT VECTOR
Figure 5-2. Stop/Halt/Wait Flowchart
Technical Data
86
MC68HC705J1A — Rev. 4.0
Low-Power Modes
MOTOROLA
Technical Data — MC68HC705J1A
Section 6. Parallel Input/Output (I/O) Ports
6.1 Contents
6.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
6.3
Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
6.3.1
Port A Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
6.3.2
Data Direction Register A. . . . . . . . . . . . . . . . . . . . . . . . . . . 90
6.3.3
Pulldown Register A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
6.3.4
Port A LED Drive Capability . . . . . . . . . . . . . . . . . . . . . . . . . 92
6.3.5
Port A I/O Pin Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
6.4
Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
6.4.1
Port B Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
6.4.2
Data Direction Register B. . . . . . . . . . . . . . . . . . . . . . . . . . . 93
6.4.3
Pulldown Register B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
6.5
5.0-Volt I/O Port Electrical Characteristics . . . . . . . . . . . . . . . . 95
6.6
3.3-Volt I/O Port Electrical Characteristics . . . . . . . . . . . . . . . . 95
6.2 Introduction
Fourteen bidirectional pins form one 8-bit input/output (I/O) port and one
6-bit I/O port. All the bidirectional port pins are programmable as inputs
or outputs.
NOTE:
Connect any unused I/O pins to an appropriate logic level, either VDD or
VSS. Although the I/O ports do not require termination for proper
operation, termination reduces excess current consumption and the
possibility of electrostatic damage.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Parallel Input/Output (I/O) Ports
87
Parallel Input/Output (I/O) Ports
Addr.
$0000
$0001
Register Name
Read:
Port A Data Register
(PORTA) Write:
See page 89.
Reset:
Read:
Port B Data Register
(PORTB) Write:
See page 92.
Reset:
Bit 7
6
5
4
3
2
1
Bit 0
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
PB2
PB1
PB0
Unaffected by reset
0
PB5
$0010
$0011
Read:
Pulldown Register A
(PDRA) Write:
See page 91.
Reset:
Read:
Pulldown Register B
(PDRB) Write:
See page 94.
Reset:
PB4
PB3
Unaffected by reset
Read:
Data Direction Register A
DDRA7
$0004
(DDRA) Write:
See page 90.
Reset:
0
Read:
Data Direction Register B
$0005
(DDRB) Write:
See page 93.
Reset:
0
0
DDRA6
DDRA5
DDRA4
DDRA3
DDRA2
DDRA1
DDRA0
0
0
0
0
0
0
0
DDRB5
DDRB4
DDRB3
DDRB2
DDRB1
DDRB0
0
0
0
0
0
0
0
0
0
PDIA7
PDIA6
PDIA5
PDIA4
PDIA3
PDIA2
PDIA1
PDIA0
0
0
0
0
0
0
0
0
PDIB5
PDIB4
PDIB3
PDIB2
PDIB1
PDIB0
0
0
0
0
0
0
= Unimplemented
Figure 6-1. Parallel I/O Port Register Summary
Technical Data
88
MC68HC705J1A — Rev. 4.0
Parallel Input/Output (I/O) Ports
MOTOROLA
Parallel Input/Output (I/O) Ports
Port A
6.3 Port A
Port A is an 8-bit bidirectional port.
6.3.1 Port A Data Register
The port A data register (PORTA) contains a latch for each port A pin.
Address:
$0000
Bit 7
6
5
4
3
2
1
Bit 0
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
Read:
Write:
Reset:
Unaffected by reset
Figure 6-2. Port A Data Register (PORTA)
PA[7:0] — Port A Data Bits
These read/write bits are software programmable. Data direction of
each port A pin is under the control of the corresponding bit in data
direction register A. Reset has no effect on port A data.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Parallel Input/Output (I/O) Ports
89
Parallel Input/Output (I/O) Ports
6.3.2 Data Direction Register A
Data direction register A (DDRA) determines whether each port A pin is
an input or an output.
Address:
$0004
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
Read:
Write:
Reset:
Figure 6-3. Data Direction Register A (DDRA)
DDRA[7:0] — Data Direction Register A Bits
These read/write bits control port A data direction. Reset clears
DDRA[7:0], configuring all port A pins as inputs.
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
NOTE:
Avoid glitches on port A pins by writing to the port A data register before
changing data direction register A bits from 0 to 1.
Figure 6-4 shows the I/O logic of port A.
READ DDRA
WRITE DDRA
INTERNAL DATA BUS
DDRAx
WRITE PORTA
10-mA SINK CAPABILITY
(PINS PA4–PA7 ONLY)
PAx
PAx
(PA0–PA3 TO
IRQ MODULE)
READ PORTA
WRITE PDRA
100-µA
PULLDOWN
PDRAx
RESET
SWPDI
Figure 6-4. Port A I/O Circuitry
Technical Data
90
MC68HC705J1A — Rev. 4.0
Parallel Input/Output (I/O) Ports
MOTOROLA
Parallel Input/Output (I/O) Ports
Port A
Writing a logic 1 to a DDRA bit enables the output buffer for the
corresponding port A pin; a logic 0 disables the output buffer.
When bit DDRAx is a logic 1, reading address $0000 reads the PAx data
latch. When bit DDRAx is a logic 0, reading address $0000 reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit. Table 6-1 summarizes the operation
of the port A pins.
Table 6-1. Port A Pin Operation
Accesses to Data Bit
Data Direction Bit
I/O Pin Mode
0
1
Read
Write
Input, high-impedance
Pin
Latch(1)
Output
Latch
Latch
1. Writing affects the data register but does not affect input.
6.3.3 Pulldown Register A
Pulldown register A (PDRA) inhibits the pulldown devices on port A pins
programmed as inputs.
NOTE:
If the SWPDI bit in the mask option register is programmed to logic 1,
reset initializes all port A pins as inputs with disabled pulldown devices.
Address:
$0010
Bit 7
6
5
4
3
2
1
Bit 0
Write:
PDIA7
PDIA6
PDIA5
PDIA4
PDIA3
PDIA2
PDIA1
PDIA0
Reset:
0
0
0
0
0
0
0
0
Read:
= Unimplemented
Figure 6-5. Pulldown Register A (PDRA)
PDIA[7:0] — Pulldown Inhibit A Bits
PDIA[7:0] disable the port A pulldown devices. Reset clears
PDIA[7:0].
1 = Corresponding port A pulldown device disabled
0 = Corresponding port A pulldown device not disabled
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Parallel Input/Output (I/O) Ports
91
Parallel Input/Output (I/O) Ports
6.3.4 Port A LED Drive Capability
The outputs for the upper four bits of port A (PA4–PA7) can drive
light-emitting diodes (LEDs). PA4–PA7 can sink approximately 10 mA of
current to VSS.
6.3.5 Port A I/O Pin Interrupts
If the PIRQ bit in the mask option register is programmed to logic 1,
PA0–PA3 pins function as external interrupt pins. See Section 8.
External Interrupt Module (IRQ).
6.4 Port B
Port B is a 6-bit bidirectional port.
6.4.1 Port B Data Register
The port B data register (PORTB) contains a latch for each port B pin.
Address:
Read:
$0001
Bit 7
6
0
0
5
4
3
2
1
Bit 0
PB5
PB4
PB3
PB2
PB1
PB0
Write:
Reset:
Unaffected by reset
= Unimplemented
Figure 6-6. Port B Data Register (PORTB)
PB[5:0] — Port B Data Bits
These read/write bits are software programmable. Data direction of
each port B pin is under the control of the corresponding bit in data
direction register B. Reset has no effect on port B data.
Technical Data
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MOTOROLA
Parallel Input/Output (I/O) Ports
Port B
6.4.2 Data Direction Register B
Data direction register B (DDRB) determines whether each port B pin is
an input or an output.
Address:
Read:
$0005
Bit 7
6
0
0
5
4
3
2
1
Bit 0
DDRB5
DDRB4
DDRB3
DDRB2
DDRB1
DDRB0
0
0
0
0
0
0
Write:
Reset:
0
0
= Unimplemented
Figure 6-7. Data Direction Register B (DDRB)
DDRB[5:0] — Data Direction Register B Bits
These read/write bits control port B data direction. Reset clears
DDRB[5:0], configuring all port B pins as inputs.
1 = Corresponding port B pin configured as output
0 = Corresponding port B pin configured as input
NOTE:
Avoid glitches on port B pins by writing to the port B data register before
changing data direction register B bits from 0 to 1.
Figure 6-8 shows the I/O logic of port B.
READ DDRB
WRITE DDRB
INTERNAL DATA BUS
DDRBx
WRITE PORTB
PBx
PBx
READ PORTB
WRITE PDRB
100-µA
PULLDOWN
PDRBx
RESET
SWPDI
Figure 6-8. Port B I/O Circuitry
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MOTOROLA
Technical Data
Parallel Input/Output (I/O) Ports
93
Parallel Input/Output (I/O) Ports
Writing a logic 1 to a DDRB bit enables the output buffer for the
corresponding port B pin; a logic 0 disables the output buffer.
When bit DDRBx is a logic 1, reading address $0001 reads the PBx data
latch. When bit DDRBx is a logic 0, reading address $0001 reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit. Table 6-2 summarizes the operation
of the port B pins.
Table 6-2. Port B Pin Operation
Data Direction Bit
Accesses to Data Bit
I/O Pin Mode
Read
Write
0
Input, high-impedance
Pin
Latch(1)
1
Output
Latch
Latch
1. Writing affects the data register, but does not affect input.
6.4.3 Pulldown Register B
Pulldown register B (PDRB) inhibits the pulldown devices on port B pins
programmed as inputs.
NOTE:
If the SWPDI bit in the mask option register is programmed to logic 1,
reset initializes all port B pins as inputs with disabled pulldown devices.
Address:
$0011
Bit 7
6
5
4
3
2
1
Bit 0
Write:
PDIB5
PDIB4
PDIB3
PDIB2
PDIB1
PDIB0
Reset:
0
0
0
0
0
0
Read:
= Unimplemented
Figure 6-9. Pulldown Register B (PDRB)
PDIB[7:0] — Pulldown Inhibit B Bits
PDIB[7:0] disable the port B pulldown devices. Reset clears
PDIB[7:0].
1 = Corresponding port B pulldown device disabled
0 = Corresponding port B pulldown device not disabled
Technical Data
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MOTOROLA
Parallel Input/Output (I/O) Ports
5.0-Volt I/O Port Electrical Characteristics
6.5 5.0-Volt I/O Port Electrical Characteristics
Characteristic(1)
Symbol
Min
Typ(2)
Max
Unit
Current drain per pin excluding PA4–PA7
I
—
25
—
mA
Output high voltage
(ILoad = –0.8 mA) PA0–PA7, PB0–PB5
VOH
VDD –0.8
—
—
V
VOL
—
—
—
—
0.4
0.4
V
Input high voltage
PA0–PA7, PB0–PB5
VIH
0.7 x VDD
—
VDD
V
Input low voltage
PA0–PA7, PB0–PB5
VIL
VSS
—
0.2 x VDD
V
I/O ports hi-z leakage current
PA0–PA7, PB0–PB5 (without individual pulldown activated)
IIL
—
0.2
±1
µA
Input pulldown current
PA0–PA7, PB0–PB5 (with individual pulldown activated)
IIL
35
80
200
µA
Symbol
Min
Typ(2)
Max
Unit
Current drain per pin excluding PA4–PA7
I
—
25
—
mA
Output high voltage
(ILoad = –0.2 mA) PA0–PA7, PB0–PB5
VOH
VDD –0.3
—
—
V
Output low voltage
(ILoad = 0.4 mA) PA0–PA3, PB0–PB5
(ILoad = 5.0 mA) PA4–PA7
VOL
—
—
—
—
0.3
0.3
V
Input high voltage
PA0–PA7, PB0–PB5
VIH
0.7 x VDD
—
VDD
V
Input low voltage
PA0–PA7, PB0–PB5
VIL
VSS
—
0.2 x VDD
V
I/O ports hi-z leakage current
PA0–PA7, PB0–PB5 (without individual pulldown activated)
IIL
—
0.1
±1
µA
Input pulldown current
PA0–PA7, PB0–PB5 (with individual pulldown activated)
IIL
12
30
100
µA
Output low voltage
(ILoad = 1.6 mA) PA0–PA3, PB0–PB5
(ILoad = 10.0 mA) PA4–PA7
1. V DD = 5.0 Vdc ± 10%, V SS = 0 Vdc, TA = –40°C to +105°C, unless otherwise noted
2. Typical values reflect average measurements at midpoint of voltage range, 25°C.
6.6 3.3-Volt I/O Port Electrical Characteristics
Characteristic(1)
1. V DD = 3.3 Vdc ± 10%, V SS= 0 Vdc, TA = –40°C to +105°C, unless otherwise noted
2. Typical values reflect average measurements at midpoint of voltage range, 25°C.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Parallel Input/Output (I/O) Ports
95
Parallel Input/Output (I/O) Ports
Technical Data
96
MC68HC705J1A — Rev. 4.0
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MOTOROLA
Technical Data — MC68HC705J1A
Section 7. Computer Operating Properly (COP) Module
7.1 Contents
7.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
7.3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
7.3.1
COP Watchdog Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
7.3.2
COP Watchdog Timeout Period . . . . . . . . . . . . . . . . . . . . . . 98
7.3.3
Clearing the COP Watchdog . . . . . . . . . . . . . . . . . . . . . . . .98
7.4
Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
7.5
COP Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
7.6
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
7.6.1
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
7.6.2
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
7.2 Introduction
The computer operating properly (COP) watchdog resets the
microcontroller (MCU) in case of software failure. Software that is
operating properly periodically services the COP watchdog and prevents
COP reset. The COP watchdog function is programmable by the
COPEN bit in the mask option register.
Features include:
•
Protection from runaway software
•
Wait and halt mode operation
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Technical Data
Computer Operating Properly (COP) Module
97
Computer Operating Properly (COP) Module
7.3 Operation
Operation of the COP is described in this subsection.
7.3.1 COP Watchdog Timeout
Four counter stages at the end of the timer make up the COP watchdog.
The COP resets the MCU if the timeout period occurs before the COP
watchdog timer is cleared by application software and the IRQ/VPP pin
voltage is between VSS and VDD. Periodically clearing the counter starts
a new timeout period and prevents COP reset. A COP watchdog timeout
indicates that the software is not executing instructions in the correct
sequence.
NOTE:
The internal clock drives the COP watchdog. Therefore, the COP
watchdog cannot generate a reset for errors that cause the internal clock
to stop.
The COP watchdog depends on a power supply voltage at or above a
minimum specification and is not guaranteed to protect against
brownout.
7.3.2 COP Watchdog Timeout Period
The COP watchdog timer function is implemented by dividing the output
of the real-time interrupt circuit (RTI) by eight. The RTI select bits in the
timer status and control register control RTI output, and the selected
output drives the COP watchdog. See timer status and control register
in Section 9. Multifunction Timer Module.
NOTE:
The minimum COP timeout period is seven times the RTI period. The
COP is cleared asynchronously with the value in the RTI divider; hence,
the COP timeout period will vary between 7x and 8x the RTI period.
7.3.3 Clearing the COP Watchdog
To clear the COP watchdog and prevent a COP reset, write a logic 0 to
bit 0 (COPC) of the COP register at location $07F0 (see Figure 7-1).
Technical Data
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Computer Operating Properly (COP) Module
MOTOROLA
Computer Operating Properly (COP) Module
Interrupts
Clearing the COP bit disables the COP watchdog timer regardless of the
IRQ/VPP pin voltage.
If the main program executes within the COP timeout period, the clearing
routine should be executed only once. If the main program takes longer
than the COP timeout period, the clearing routine must be executed
more than once.
NOTE:
Place the clearing routine in the main program and not in an interrupt
routine. Clearing the COP watchdog in an interrupt routine might prevent
COP watchdog timeouts even though the main program is not operating
properly.
7.4 Interrupts
The COP watchdog does not generate interrupts.
7.5 COP Register
The COP register (COPR) is a write-only register that returns the
contents of EPROM location $07F0 when read.
Address:
$07F0
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Write:
COPC
Reset:
0
= Unimplemented
Figure 7-1. COP Register (COPR)
COPC — COP Clear Bit
This write-only bit resets the COP watchdog. Reading address $07F0
returns undefined results.
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Technical Data
Computer Operating Properly (COP) Module
99
Computer Operating Properly (COP) Module
7.6 Low-Power Modes
The STOP and WAIT instructions have these effects on the COP
watchdog.
7.6.1 Stop Mode
The STOP instruction clears the COP watchdog counter and disables
the clock to the COP watchdog.
NOTE:
To prevent the STOP instruction from disabling the COP watchdog,
program the stop-to-wait conversion bit (SWAIT) in the mask option
register to logic 1.
Upon exit from stop mode by external reset:
•
The counter begins counting from $0000.
•
The counter is cleared again after the oscillator stabilization delay
and begins counting from $0000 again.
Upon exit from stop mode by external interrupt:
NOTE:
•
The counter begins counting from $0000.
•
The counter is not cleared again after the oscillator stabilization
delay and continues counting throughout the oscillator
stabilization delay.
Immediately after exiting stop mode by external interrupt, service the
COP to ensure a full COP timeout period.
7.6.2 Wait Mode
The WAIT instruction has no effect on the COP watchdog.
NOTE:
To prevent a COP timeout during wait mode, exit wait mode periodically
to service the COP.
Technical Data
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Computer Operating Properly (COP) Module
MOTOROLA
Technical Data — MC68HC705J1A
Section 8. External Interrupt Module (IRQ)
8.1 Contents
8.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
8.3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
8.3.1
IRQ/VPP Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
8.3.2
Optional External Interrupts . . . . . . . . . . . . . . . . . . . . . . . . 104
8.4
IRQ Status and Control Register . . . . . . . . . . . . . . . . . . . . . . 106
8.5
External Interrupt Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
8.5.1
5.0-Volt External Interrupt Timing Characteristics . . . . . . . 107
8.5.2
3.3-Volt External Interrupt Timing Characteristics . . . . . . . 107
8.2 Introduction
The external interrupt (IRQ) module provides asynchronous external
interrupts to the CPU. These sources can generate external interrupts:
•
IRQ/VPP pin
•
PA0–PA3 pins
Features include:
•
Dedicated external interrupt pin (IRQ/VPP)
•
Selectable interrupt on four input/output (I/O) pins (PA0–PA3)
•
Programmable edge-only or edge- and level-interrupt sensitivity
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Technical Data
External Interrupt Module (IRQ)
101
External Interrupt Module (IRQ)
8.3 Operation
The interrupt request/programming voltage pin (IRQ/VPP) and port A
pins 0–3 (PA0–PA3) provide external interrupts. The PIRQ bit in the
mask option register (MOR) enables PA0–PA3 as IRQ interrupt sources,
which are combined into a single ORing function to be latched by the
IRQ latch. Figure 8-1 shows the structure of the IRQ module.
After completing its current instruction, the CPU tests the IRQ latch. If the
IRQ latch is set, the CPU then tests the I bit in the condition code register
and the IRQE bit in the IRQ status and control register. If the
I bit is clear and the IRQE bit is set, the CPU then begins the interrupt
sequence. This interrupt is serviced by the interrupt service routine
located at $07FA and $07FB.
The CPU clears the IRQ latch while it fetches the interrupt vector, so that
another external interrupt request can be latched during the interrupt
service routine. As soon as the I bit is cleared during the return from
interrupt, the CPU can recognize the new interrupt request. Figure 8-2
shows the sequence of events caused by an interrupt.
TO BIH & BIL
INSTRUCTION
PROCESSING
IRQ
LEVEL-SENSITIVE TRIGGER
(MOR LEVEL BIT)
IRQF
VDD
EXTERNAL
INTERRUPT
REQUEST
D IRQ Q
LATCH
CK
PA3
PA2
PA1
PA0
IRQE
CLR
PIRQ
(MOR)
RESET
IRQ VECTOR FETCH
IRQR
Figure 8-1. IRQ Module Block Diagram
Technical Data
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External Interrupt Module (IRQ)
MOTOROLA
External Interrupt Module (IRQ)
Operation
FROM RESET
YES
I BIT SET?
NO
EXTERNAL
INTERRUPT?
YES
CLEAR IRQ LATCH
NO
TIMER
INTERRUPT?
YES
STACK PCL, PCH, X, A, CCR
SET I BIT
LOAD PC WITH INTERRUPT VECTOR
NO
FETCH NEXT
INSTRUCTION
SWI
INSTRUCTION?
YES
NO
RTI
INSTRUCTION?
NO
YES
UNSTACK CCR, A, X, PCH, PCL
EXECUTE INSTRUCTION
Figure 8-2. Interrupt Flowchart
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Technical Data
External Interrupt Module (IRQ)
103
External Interrupt Module (IRQ)
8.3.1 IRQ/VPP Pin
An interrupt signal on the IRQ/VPP pin latches an external interrupt
request. The LEVEL bit in the mask option register provides negative
edge-sensitive triggering or both negative edge-sensitive and low
level-sensitive triggering for the interrupt function.
If edge- and level-sensitive triggering is selected, a falling edge or a low
level on the IRQ/VPP pin latches an external interrupt request. Edge- and
level-sensitive triggering allows the use of multiple wired-OR external
interrupt sources. An external interrupt request is latched as long as any
source is holding the IRQ/VPP pin low.
If level-sensitive triggering is selected, the IRQ/VPP input requires an
external resistor to VDD for wired-OR operation. If the IRQ/VPP pin is not
used, it must be tied to the VDD supply.
If edge-sensitive-only triggering is selected, a falling edge on the
IRQ/VPP pin latches an external interrupt request. A subsequent external
interrupt request can be latched only after the voltage level on the
IRQ/VPP pin returns to logic 1 and then falls again to logic 0.
The IRQ/VPP pin contains an internal Schmitt trigger as part of its input
to improve noise immunity. The voltage on this pin can affect the mode
of operation and should not exceed VDD.
8.3.2 Optional External Interrupts
The inputs for the lower four bits of port A (PA0–PA3) can be connected
to the IRQ pin input of the CPU if enabled by the PIRQ bit in the mask
option register. This capability allows keyboard scan applications where
the transitions or levels on the I/O pins will behave the same as the
IRQ/VPP pin except for the inverted phase (logic 1, rising edge). The
active state of the IRQ/VPP pin is a logic 0 (falling edge).
The PA0–PA3 pins are selected as a group to function as IRQ interrupts
and are enabled by the IRQE bit in the IRQ status and control register.
The PA0–PA3 pins can be positive-edge triggered only or positive-edge
and high-level triggered.
Technical Data
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External Interrupt Module (IRQ)
MOTOROLA
External Interrupt Module (IRQ)
Operation
If edge- and level-sensitive triggering is selected, a rising edge or a high
level on a PA0–PA3 pin latches an external interrupt request. Edge- and
level-sensitive triggering allows the use of multiple wired-OR external
interrupt sources. As long as any source is holding a PA0–PA3 pin high,
an external interrupt request is latched, and the CPU continues to
execute the interrupt service routine.
If edge-sensitive only triggering is selected, a rising edge on a PA0–PA3
pin latches an external interrupt request. A subsequent external interrupt
request can be latched only after the voltage level of the previous
interrupt signal returns to logic 0 and then rises again to logic 1.
NOTE:
The branch if interrupt pin is high (BIH) and branch if interrupt pin is low
(BIL) instructions apply only to the level on the IRQ/VPP pin itself and not
to the output of the logic OR function with the PA0–PA3 pins. The state
of the individual port A pins can be checked by reading the appropriate
port A pins as inputs.
Enabled PA0–PA3 pins cause an IRQ interrupt regardless of whether
these pins are configured as inputs or outputs.
The IRQ pin has an internal Schmitt trigger. The optional external
interrupts (PA0–PA3) do not have internal Schmitt triggers.
The interrupt mask bit (I) in the condition code register (CCR) disables
all maskable interrupt requests, including external interrupt requests.
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Technical Data
External Interrupt Module (IRQ)
105
External Interrupt Module (IRQ)
8.4 IRQ Status and Control Register
The IRQ status and control register (ISCR) controls and monitors
operation of the IRQ module. All unused bits in the ISCR read as
logic 0s. The IRQF bit is cleared and the IRQE bit is set by reset.
Address:
$000A
Bit 7
Read:
6
5
4
3
2
1
Bit 0
0
0
0
IRQF
0
0
0
IRQE
R
Write:
Reset:
1
0
0
IRQR
0
= Unimplemented
0
0
0
0
R = Reserved
Figure 8-3. IRQ Status and Control Register (ISCR)
IRQR — Interrupt Request Reset Bit
This write-only bit clears the external interrupt request flag.
1 = Clears external interrupt and IRQF bit
0 = No effect on external interrupt and IRQF bit
IRQF — External Interrupt Request Flag
The external interrupt request flag is a clearable, read-only bit that is
set when an external interrupt request is pending. Reset clears the
IRQF bit.
1 = External interrupt request pending
0 = No external interrupt request pending
IRQE — External Interrupt Request Enable Bit
This read/write bit enables external interrupts. Reset sets the IRQE
bit.
1 = External interrupt requests enabled
0 = External interrupt requests disabled
The STOP and WAIT instructions set the IRQE bit so that an external
interrupt can bring the MCU out of these low-power modes. In addition,
reset sets the I bit which masks all interrupt sources.
Technical Data
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External Interrupt Module (IRQ)
MOTOROLA
External Interrupt Module (IRQ)
External Interrupt Timing
8.5 External Interrupt Timing
tILIL
tILIH
IRQ PIN
tILIH
IRQ1
.
.
.
IRQn
IRQ (INTERNAL)
Figure 8-4. External Interrupt Timing
8.5.1 5.0-Volt External Interrupt Timing Characteristics
Characteristic(1)
Symbol
Min
Max
Unit
IRQ interrupt pulse width low (edge-triggered)
tILIH
1.5
—
tcyc(2)
IRQ interrupt pulse width (edge- and level-triggered)
tILIH
1.5
Note(3)
tcyc
PA0–PA3 interrupt pulse width high (edge-triggered)
tILIL
1.5
—
tcyc
PA0–PA3 interrupt pulse width high (edge- and level-triggered)
tILIH
1.5
Note(3)
tcyc
1. V DD = 5.0 Vdc ± 10%, V SS = 0 Vdc, TA = –40°C to +105°C, unless otherwise noted
2. tcyc = 1/fop; fop = fosc/2.
3. The minimum, tILIL, should not be less than the number of interrupt service routine cycles plus 19 tcyc.
8.5.2 3.3-Volt External Interrupt Timing Characteristics
Characteristic(1)
Symbol
Min
Max
Unit
IRQ interrupt pulse width low (edge-triggered)
tILIH
1.5
—
tcyc(2)
IRQ interrupt pulse width (edge- and level-triggered)
tILIH
1.5
Note(3)
tcyc
PA0–PA3 interrupt pulse width high (edge-triggered)
tILIL
1.5
—
tcyc
PA0–PA3 interrupt pulse width high (edge- and level-triggered)
tILIH
1.5
Note(3)
tcyc
1. V DD = 3.3 Vdc ± 10%, V SS = 0 Vdc, TA = –40°C to +105°C, unless otherwise noted
2. tcyc = 1/fop; fop = fosc/2.
3. The minimum, tILIL, should not be less than the number of interrupt service routine cycles plus 19 tcyc.
MC68HC705J1A — Rev. 4.0
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Technical Data
External Interrupt Module (IRQ)
107
External Interrupt Module (IRQ)
Technical Data
108
MC68HC705J1A — Rev. 4.0
External Interrupt Module (IRQ)
MOTOROLA
Technical Data — MC68HC705J1A
Section 9. Multifunction Timer Module
9.1 Contents
9.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
9.3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
9.4
Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
9.5
I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
9.5.1
Timer Status and Control Register . . . . . . . . . . . . . . . . . . .112
9.5.2
Timer Counter Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
9.6
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
9.6.1
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115
9.6.2
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115
9.2 Introduction
The multifunction timer provides a timing reference with programmable
real-time interrupt (RTI) capability. Figure 9-1 shows the timer
organization.
Features include:
•
Timer overflow
•
Four selectable interrupt rates
•
Computer operating properly (COP) watchdog timer
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Technical Data
Multifunction Timer Module
109
Multifunction Timer Module
RESET
OVERFLOW
÷ 4
TIMER COUNTER REGISTER
INTERNAL CLOCK
(XTAL ÷ 2)
BITS [0:7] OF 15-STAGE
RIPPLE COUNTER
INTERNAL DATA BUS
RESET
RTIFR
TOFR
RTIE
TOIE
RTIF
TOF
INTERRUPT
REQUEST
RT0
RT1
TIMER STATUS/CONTROL REGISTER
RESET
CLEAR COP TIMER
RTI RATE SELECT
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
÷ 2
BITS [8:14] OF 15-STAGE RIPPLE COUNTER
÷ 8
S
Q
COP RESET
R
RESET
Figure 9-1. Multifunction Timer Block Diagram
Technical Data
110
MC68HC705J1A — Rev. 4.0
Multifunction Timer Module
MOTOROLA
Multifunction Timer Module
Operation
Addr.
$0008
$0009
Register Name
Read:
Timer Status and Control
Register (TSCR) Write:
See page 112.
Reset:
Timer Counter Register Read:
(TCR)
Write:
See page 114.
Reset:
Bit 7
6
TOF
RTIF
5
4
TOIE
RTIE
3
2
0
0
TOFR
RTIFR
1
Bit 0
RT1
RT0
0
0
0
0
0
0
1
1
TMR7
TMR6
TMR5
TMR4
TMR3
TMR2
TMR1
TMR0
0
0
0
0
0
0
0
0
= Unimplemented
Figure 9-2. I/O Register Summary
9.3 Operation
A 15-stage ripple counter, preceded by a prescaler that divides the
internal clock signal by four, provides the timing reference for the timer
functions. The value of the first eight timer stages can be read at any
time by accessing the timer counter register at address $0009. A timer
overflow function at the eighth stage allows a timer interrupt every 1024
internal clock cycles.
The next four stages lead to the real-time interrupt (RTI) circuit. The RT1
and RT0 bits in the timer status and control register at address $0008
allow a timer interrupt every 16,384, 32,768, 65,536, or 131,072 clock
cycles. The last four stages drive the selectable COP system. For
information on the COP, refer to the Section 7. Computer Operating
Properly (COP) Module.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Multifunction Timer Module
111
Multifunction Timer Module
9.4 Interrupts
These timer sources can generate interrupts:
•
Timer overflow flag (TOF) — The TOF bit is set when the first eight
stages of the counter roll over from $FF to $00. The timer overflow
interrupt enable bit, TOIE, enables TOF interrupt requests.
•
Real-time interrupt flag (RTIF) — The RTIF bit is set when the
selected RTI output becomes active. The real-time interrupt
enable bit, RTIE, enables RTIF interrupt requests.
9.5 I/O Registers
These registers control and monitor the timer operation:
•
Timer status and control register (TSCR)
•
Timer counter register (TCR)
9.5.1 Timer Status and Control Register
The read/write timer status and control register (TSCR) performs these
functions:
•
Flags timer interrupts
•
Enables timer interrupts
•
Resets timer interrupt flags
•
Selects real-time interrupt rates
Address:
Read:
$0008
Bit 7
6
TOF
RTIF
5
4
TOIE
RTIE
Write:
Reset:
0
0
0
0
3
2
0
0
TOFR
RTIFR
0
0
1
Bit 0
RT1
RT0
1
1
= Unimplemented
Figure 9-3. Timer Status and Control Register (TSCR)
Technical Data
112
MC68HC705J1A — Rev. 4.0
Multifunction Timer Module
MOTOROLA
Multifunction Timer Module
I/O Registers
TOF — Timer Overflow Flag
This read-only flag becomes set when the first eight stages of the
counter roll over from $FF to $00. TOF generates a timer overflow
interrupt request if TOIE is also set. Clear TOF by writing a logic 1 to
the TOFR bit. Writing to TOF has no effect. Reset clears TOF.
RTIF — Real-Time Interrupt Flag
This read-only flag becomes set when the selected RTI output
becomes active. RTIF generates a real-time interrupt request if RTIE
is also set. Clear RTIF by writing a logic 1 to the RTIFR bit. Writing
to RTIF has no effect. Reset clears RTIF.
TOIE — Timer Overflow Interrupt Enable Bit
This read/write bit enables timer overflow interrupts. Reset clears
TOIE.
1 = Timer overflow interrupts enabled
0 = Timer overflow interrupts disabled
RTIE — Real-Time Interrupt Enable Bit
This read/write bit enables real-time interrupts. Reset clears RTIE.
1 = Real-time interrupts enabled
0 = Real-time interrupts disabled
TOFR — Timer Overflow Flag Reset Bit
Writing a logic 1 to this write-only bit clears the TOF bit. TOFR always
reads as logic 0. Reset clears TOFR.
RTIFR — Real-Time Interrupt Flag Reset Bit
Writing a logic 1 to this write-only bit clears the RTIF bit. RTIFR
always reads as logic 0. Reset clears RTIFR.
RT1 and RT0 — Real-Time Interrupt Select Bits
These read/write bits select one of four real-time interrupt rates, as
shown in Table 9-1. Because the selected RTI output drives the COP
watchdog, changing the real-time interrupt rate also changes the
counting rate of the COP watchdog. Reset sets RT1 and RT0.
NOTE:
Changing RT1 and RT0 when a COP timeout is imminent can cause a
real-time interrupt request to be missed or an additional real-time
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Multifunction Timer Module
113
Multifunction Timer Module
interrupt request to be generated. To prevent this occurrence, clear the
COP timer before changing RT1 and RT0.
Table 9-1. Real-Time Interrupt Rate Selection
RT1:RT0
Number
of Cycles
to RTI
RTI
Period(1)
Number
of Cycles
to COP Reset
COP Timeout
Period(1)
00
214 = 16,384
8.2 ms
217 = 131,072
65.5 ms
01
215 = 32,768
16.4 ms
218 = 262,144
131.1 ms
10
216 = 65,536
32.8 ms
219 = 524,288
262.1 ms
11
217 = 131,072
65.5 ms
220 = 1,048,576
524.3 ms
1. At 2-MHz bus, 4-MHz XTAL, 0.5 µs per cycle
9.5.2 Timer Counter Register
A 15-stage ripple counter is the core of the timer. The value of the first
eight stages is readable at any time from the read-only timer counter
register (TCR) shown in Figure 9-4.
Address:
Read:
$0009
Bit 7
6
5
4
3
2
1
Bit 0
TMR7
TMR6
TMR5
TMR4
TMR3
TMR2
TMR1
TMR0
0
0
0
0
0
0
0
0
Write:
Reset:
= Unimplemented
Figure 9-4. Timer Counter Register (TCR)
Power-on clears the entire counter chain and the internal clock begins
clocking the counter. After 4064 cycles (or 16 cycles if the SOSCD bit in
the mask option register is set), the power-on reset circuit is released,
clearing the counter again and allowing the MCU to come out of reset.
A timer overflow function at the eighth counter stage allows a timer
interrupt every 1024 internal clock cycles.
Technical Data
114
MC68HC705J1A — Rev. 4.0
Multifunction Timer Module
MOTOROLA
Multifunction Timer Module
Low-Power Modes
9.6 Low-Power Modes
The STOP and WAIT instructions put the MCU in low
power-consumption standby states.
9.6.1 Stop Mode
The STOP instruction has these effects on the timer:
•
Clears the timer counter
•
Clears interrupt flags (TOF and RTIF) and interrupt enable bits
(TOFE and RTIE) in TSCR, removing any pending timer interrupt
requests and disabling further timer interrupts.
9.6.2 Wait Mode
The timer remains active after a WAIT instruction. Any enabled timer
interrupt request can bring the MCU out of wait mode.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Multifunction Timer Module
115
Multifunction Timer Module
Technical Data
116
MC68HC705J1A — Rev. 4.0
Multifunction Timer Module
MOTOROLA
Technical Data — MC68HC705J1A
Section 10. Electrical Specifications
10.1 Contents
10.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
10.3
Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
10.4
Operating Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . 119
10.5
Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
10.6
Power Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
10.7
5.0-Volt DC Electrical Characteristics. . . . . . . . . . . . . . . . . . .121
10.8
3.3-Volt DC Electrical Characteristics . . . . . . . . . . . . . . . . . . 122
10.9
Driver Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
10.10 Typical Supply Currents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
10.11 EPROM Programming Characteristics . . . . . . . . . . . . . . . . . . 126
10.12 5.0-Volt Control Timing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
10.13 3.3-Volt Control Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
10.2 Introduction
This section contains electrical and timing specifications.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Electrical Specifications
117
Electrical Specifications
10.3 Maximum Ratings
Maximum ratings are the extreme limits to which the 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 the table here. 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(1)
Symbol
Value
Unit
VDD
–0.3 to +7.0
V
I
25
mA
Input voltage
VIn
VSS – 0.3 to VDD + 0.3
V
IRQ/VPP pin
VPP
VSS – 0.3
to 2 x VDD + 0.3
V
Storage temperature range
TSTG
–65 to +150
°C
Supply voltage
Current drain per pin (excluding
VDD, VSS, and PA4–PA7)
1. Voltages are referenced to VSS.
NOTE:
This device is not guaranteed to operate properly at the maximum
ratings. Refer to 10.7 5.0-Volt DC Electrical Characteristics and
10.8 3.3-Volt DC Electrical Characteristics for guaranteed operating
conditions.
Technical Data
118
MC68HC705J1A — Rev. 4.0
Electrical Specifications
MOTOROLA
Electrical Specifications
Operating Temperature Range
10.4 Operating Temperature Range
Symbol
Value
(TL to TH)
Unit
MC68HC705J1AP(1), DW(2), S(3)
TA
0 to 70
°C
MC68HC705J1AC(4)P, CDW, CS
TA
–40 to +85
°C
MC68HC705J1AV(5)P, VDW, VS
TA
–40 to +105
°C
Package Type
1. P = plastic dual in-line package (PDIP)
2. DW = small outline integrated circuit (SOIC)
3. S = ceramic DIP (cerdip)
4. C = extended temperature range
5. V = automotive temperature range
10.5 Thermal Characteristics
Characteristic
Thermal resistance
MC68HC705J1AP(1)
MC68HC705J1ADW (2)
MC68HC705J1AS(3)
Symbol
Value
Unit
θJA
60
°C/W
1. P = plastic dual in-line package (PDIP)
2. DW = small outline integrated circuit (SOIC)
3. S = ceramic DIP (cerdip)
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Electrical Specifications
119
Electrical Specifications
10.6 Power Considerations
The average chip junction temperature, TJ, in °C can be obtained from:
TJ = TA + (PD x θJA)
(1)
Where:
TA = ambient temperature in °C
θJA = package thermal resistance, junction to ambient in °C/W
PD = PINT + PI/O
PINT = ICC × VCC = chip internal power dissipation
PI/O = power dissipation on input and output pins (user-determined)
For most applications, PI/O < PINT and can be neglected.
Ignoring PI/O, the relationship between PD and TJ is approximately:
K
PD =
(2)
TJ + 273°C
Solving equations (1) and (2) for K gives:
= PD x (TA + 273°C) + θJA x (PD)2
(3)
where K is a constant pertaining to the particular part. K can be
determined from equation (3) by measuring PD (at equilibrium) for a
known TA. Using this value of K, the values of PD and TJ can be obtained
by solving equations (1) and (2) iteratively for any value of TA.
Technical Data
120
MC68HC705J1A — Rev. 4.0
Electrical Specifications
MOTOROLA
Electrical Specifications
5.0-Volt DC Electrical Characteristics
10.7 5.0-Volt DC Electrical Characteristics
Characteristic(1)
Symbol
Min
Typ(2)
Max
Unit
VOL
VOH
—
VDD – 0.1
—
—
0.1
—
V
Output high voltage
(ILoad = –0.8 mA) PA0–PA7, PB0–PB5
VOH
VDD – 0.8
—
—
V
Output low voltage
(ILoad = 1.6 mA) PA0–PA3, PB0–PB5
(ILoad = 10.0 mA) PA4–PA7
VOL
—
—
0.4
0.4
V
Input high voltage
PA0–PA7, PB0–PB5, IRQ/VPP, RESET, OSC1
VIH
0.7 × VDD
—
VDD
V
Input low voltage
PA0–PA7, PB0–PB5, IRQ/VPP, RESET, OSC1
VIL
VSS
—
0.2 × VDD
V
—
—
3.5
0.45
6.0
2.75
mA
mA
—
—
0.2
2.0
10
20
µA
µA
IIL
—
0.2
±1
µA
IIL
35
80
200
µA
IIL
–15
–35
–85
µA
IIn
—
0.2
±1
µA
COut
CIn
—
—
—
—
12
8
pF
Rosc
1.0
2.0
3.0
MΩ
Output voltage
ILoad = 10.0 µA
ILoad = –10.0 µA
Supply current
Run mode (3)
Wait mode(4)
Stop mode(5)
25°C
–40 to 105°C
I/O ports hi-z leakage current
PA0–PA7, PB0–PB5 (without individual pulldown activated)
Input pulldown current
PA0–PA7, PB0–PB5 (with individual pulldown activated)
Input pullup current
RESET
Input current(6)
RESET, IRQ/VPP, OSC1
Capacitance
Ports (as inputs or outputs)
RESET, IRQ/VPP, OSC1, OSC2
Crystal/ceramic resonator oscillator mode internal resistor
OSC1 to OSC2(7)
IDD
1. V DD = 5.0 Vdc ± 10%, V SS = 0 Vdc, TA = –40°C to +105°C, unless otherwise noted
2. Typical values at midpoint of voltage range, 25°C only
3. Run mode IDD is measured using external square wave clock source (fosc = 4.2 MHz); all inputs 0.2 V from rail; no dc loads;
less than 50 pF on all outputs; CL = 20 pF on OSC2
4. Wait mode IDD: only timer system active. Wait mode is affected linearly by OSC2 capacitance. Wait mode is measured
with all ports configured as inputs; VIL = 0.2 V; VIH = VDD – 0.2 V. Wait mode IDD is measured using external square wave
clock source (fosc = 4.2 MHz); all inputs 0.2 V from rail; no dc loads; less than 50 pF on all outputs; CL = 20 pF on OSC2.
5. Stop mode IDD is measured with OSC1 = VSS. Stop mode IDD is measured with all ports configured as inputs; VIL = 0.2 V;
VIH = V DD – 0.2 V
6. Only input high current rated to +1 µA on RESET.
7. The Rosc value selected for RC oscillator versions of this device is unspecified. See Appendix C. MC68HSR705J1A for
additional information.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Electrical Specifications
121
Electrical Specifications
10.8 3.3-Volt DC Electrical Characteristics
Characteristic(1)
Symbol
Min
Typ(2)
Max
Unit
VOL
VOH
—
VDD– 0.1
—
—
0.1
—
V
Output high voltage
(ILoad = –0.2 mA) PA0–PA7, PB0–PB5
VOH
VDD – 0.3
—
—
V
Output low voltage
(ILoad = 0.4 mA) PA0–PA3, PB0–PB5
(ILoad = 5.0 mA) PA4–PA7
VOL
—
—
0.3
0.3
V
Input high voltage
PA0–PA7, PB0–PB5, IRQ/VPP, RESET, OSC1
VIH
0.7 × VDD
—
VDD
V
Input low voltage
PA0–PA7, PB0–PB5, IRQ/VPP, RESET, OSC1
VIL
VSS
—
0.2 × VDD
V
—
—
1.2
0.25
4.0
1.5
mA
mA
—
—
0.1
1.0
5
10
µA
µA
IIL
—
0.1
±1
µA
IIL
12
30
100
µA
IIL
–10
–25
–45
µA
IIn
—
0.1
±1
µA
COut
CIn
—
—
—
—
12
8
pF
Rosc
1.0
2.0
3.0
MΩ
Output voltage
ILoad = 10.0 µA
ILoad = –10.0 µA
Supply current
Run Mode (3)
Wait Mode(4)
Stop Mode(5)
25°C
–40 to 105°C
I/O ports hi-z leakage current
PA0–PA7, PB0–PB5 (without individual pulldown activated)
Input pulldown current
PA0–PA7, PB0–PB5 (with individual pulldown activated)
Input pullup current
RESET
Input current(6)
RESET, IRQ/VPP, OSC1
Capacitance
Ports (as inputs or outputs)
RESET, IRQ/VPP, OSC1, OSC2
Crystal/ceramic resonator oscillator mode internal resistor
OSC1 to OSC2(7)
IDD
1. V DD = 3.3 Vdc ± 10%, V SS = 0 Vdc, TA = –40°C to +105°C, unless otherwise noted
2. Typical values at midpoint of voltage range, 25°C only
3. Run mode IDD is measured using external square wave clock source (fosc = 2.0 MHz); all inputs 0.2 V from rail; no dc loads;
less than 50 pF on all outputs; CL = 20 pF on OSC2
4. Wait mode IDD: only timer system active. Wait mode is affected linearly by OSC2 capacitance. Wait mode is measured
with all ports configured as inputs; VIL = 0.2 V; VIH = VDD – 0.2 V. Wait mode IDD is measured using external square wave
clock source (fosc = 2.0 MHz); all inputs 0.2 V from rail; no dc loads; less than 50 pF on all outputs; CL = 20 pF on OSC2.
5. Stop mode IDD is measured with OSC1 = VSS. Stop mode IDD is measured with all ports configured as inputs; VIL = 0.2 V;
VIH = V DD – 0.2 V
6. Only input high current rated to +1 µA on RESET.
7. The R osc value selected for RC oscillator versions of this device is unspecified. See Appendix C. MC68HSR705J1A for
additional information.
Technical Data
122
MC68HC705J1A — Rev. 4.0
Electrical Specifications
MOTOROLA
Electrical Specifications
Driver Characteristics
10.9 Driver Characteristics
L PR
°C
NOM
INA
−40
°C
300 mV
100 mV
0
−1.0 mA −2.0 mA −3.0 mA −4.0 mA −5.0 mA
0
V DD = 3.3 V
SE
100 mV
OT
E
200 mV
VDD = 5.0 V
EN
200 mV
0
400 mV
2
300 mV
500 mV
25 °
C
−4
25
°
400 mV
105
600 mV
CN
500 mV
700 mV
VDD - VOH
600 mV
85 °
C
OCE
SSIN
G
OM
INA
85
0°
°C
LP
C
RO
CE
SS
I NG
°C
105
SE
EN
700 mV
VDD - VOH
800 mV
OT
E1
800 mV
0
−1.0 mA −2.0 mA −3.0 mA −4.0 mA −5.0 mA
IOH
IOH
Notes:
1. At VDD = 5.0 V, devices are specified and tested for (VDD – VOH) ≤ 800 mV @ IOH = –0.8 mA.
2. At VDD = 3.3 V, devices are specified and tested for (VDD – VOH) ≤ 300 mV @ IOH = –0.2 mA.
Figure 10-1. PA0–PA7, PB0–PB5 Typical High-Side Driver Characteristics
25°C NOMINAL PROCESSING
SEE NOTE 2
°C
–40
85 °
C
°C
300 mV
250 mV
VOL
250 mV
VOL
105
°C
350 mV
–4 0
300 mV
85 °
C
105
°C
400 mV
350 mV
200 mV
150 mV
200 mV
150 mV
100 mV
VDD = 5.0 V
50 mV
0
25°C NOMINAL PROCESSING
SEE NOTE 2
400 mV
100 mV
VDD = 3.3 V
50 mV
0
2.0 mA
4.0 mA
6.0 mA 8.0 mA 10.0 mA
0
0
IOL
2.0 mA
4.0 mA
6.0 mA 8.0 mA 10.0 mA
IOL
Notes:
1. At V DD = 5.0 V, devices are specified and tested for VOL ≤ 400 mV @ IOL = 1.6 mA.
2. At V DD = 3.3 V, devices are specified and tested for VOL ≤ 300 mV @ IOL = 0.4 mA.
Figure 10-2. PA0–PA3, PB0–PB5 Typical Low-Side Driver Characteristics
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Electrical Specifications
123
Electrical Specifications
°C
700 mV
105
NO
M
INA
L
NO T
E2
°C
400 mV
25
300 mV
300 mV
200 mV
200 mV
VDD = 5.0 V
V DD = 3.3 V
100 mV
0
SEE
°C
25
400 mV
500 mV
VOL
NO
SEE
VOL
500 mV
600 mV
NO
MI
TE
1
600 mV
105
°C
85
700 mV
85 °
C
PR
OC
E
SS
−40
ING
°C
800 mV
°C
NA
LP
RO
CE
−4
SS
0
°C
IN
G
800 mV
100 mV
0
10 mA
20 mA
30 mA
40 mA
50 mA
0
IOL
0
10 mA
20 mA
30 mA
40 mA
50 mA
IOL
Notes:
1. At VDD = 5.0 V, devices are specified and tested for V OL ≤ 400 mV @ IOL = 10.0 mA.
2. At VDD = 3.3 V, devices are specified and tested for V OL ≤ 300 mV @ IOL = 5.0 mA.
Figure 10-3. PA4–PA7 Typical Low-Side Driver Characteristics
Technical Data
124
MC68HC705J1A — Rev. 4.0
Electrical Specifications
MOTOROLA
Electrical Specifications
Typical Supply Currents
10.10 Typical Supply Currents
6.0 mA
SEE NOTE 1
SUPPLY CURRENT (IDD)
5.0 mA
SEE NOTE 2
4.0 mA
5.5 V
3.0 mA
4.5 V
2.0 mA
3.6 V
1.0 mA
3.0 V
0
0
1.0 MHz
2.0 MHz
INTERNAL OPERATING FREQUENCY (fOP)
Notes:
1. At VDD = 5.0 V, devices are specified and tested for IDD ≤ 6.0 mA @ fOP = 2.1 MHz.
2. At VDD = 3.3 V, devices are specified and tested for IDD ≤ 4.0 mA @ fOP = 1.0 MHz.
Figure 10-4. Typical Operating IDD (25°C)
SEE NOTE 2
SEE NOTE 1
700 µA
600 µA
SUPPLY CURRENT (IDD)
5.5 V
500 µA
4.5 V
400 µA
300 µA
3.6 V
3.0 V
200 µA
100 µA
0
0
1.0 MHz
2.0 MHz
INTERNAL OPERATING FREQUENCY (fOP)
Notes:
1. At VDD = 5.0 V, devices are specified and tested for IDD ≤ 2.75 mA @ fOP = 2.1 MHz.
2. At VDD = 3.3 V, devices are specified and tested for IDD ≤ 1.5 mA @ fOP = 1.0 MHz.
Figure 10-5. Typical Wait Mode IDD (25°C)
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Electrical Specifications
125
Electrical Specifications
10.11 EPROM Programming Characteristics
Characteristic(1)
Symbol
Min
Typ
Max
Unit
Programming voltage
IRQ/VPP
VPP
16.0
16.5
17.0
V
Programming current
IRQ/VPP
IPP
—
3.0
10.0
mA
tEPGM
tMPGM
4
4
—
—
—
—
ms
Symbol
Min
Max
Unit
Oscillator frequency
Crystal oscillator option
External clock source
fosc
—
dc
4.2
4.2
MHz
Internal operating frequency (fosc ÷ 2)
Crystal oscillator
External clock
fop
—
dc
2.1
2.1
MHz
Cycle time (1 ÷ fOP)
tcyc
476
—
ns
RESET pulse width low
tRL
1.5
—
tcyc
IRQ interrupt pulse width low (edge-triggered)
tILIH
1.5
—
tcyc
IRQ interrupt pulse width low (edge- and level-triggered)
tILIL
1.5
Note(2)
tcyc
PA0–PA3 interrupt pulse width high (edge-triggered)
tIHIL
1.5
—
tcyc
PA0–PA3 interrupt pulse width (edge- and level-triggered)
tIHIH
1.5
Note(2)
tcyc
tOH, tOL
200
—
ns
Programming time
Per array byte
MOR
1. V DD = 5.0 Vdc ± 10%, V SS = 0 Vdc, T = –40°C to +105°C, unless otherwise noted
A
10.12 5.0-Volt Control Timing
Characteristic(1)
OSC1 pulse width
1. VDD = 5.0 Vdc ± 10%, V SS = 0 Vdc, T = –40°C to +105°C, unless otherwise noted
A
2. The maximum width, tILIL or tILIH, should not be more than the number of cycles it takes to execute the interrupt service
routine plus 19 tcyc or the interrupt service routine will be re-entered.
Technical Data
126
MC68HC705J1A — Rev. 4.0
Electrical Specifications
MOTOROLA
Electrical Specifications
3.3-Volt Control Timing
10.13 3.3-Volt Control Timing
Characteristic(1)
Symbol
Min
Max
Unit
Oscillator frequency
Crystal oscillator option
External clock source
fosc
—
dc
2.0
2.0
MHz
Internal operating frequency (fosc ÷ 2)
Crystal oscillator
External clock
fop
—
dc
1.0
1.0
MHz
Cycle time (1 ÷ fOP)
tcyc
1000
—
ns
RESET pulse width low
tRL
1.5
—
tcyc
IRQ interrupt pulse width low (edge-triggered)
tILIH
1.5
—
tcyc
IRQ interrupt pulse width low (edge- and level-triggered)
tILIL
1.5
Note(2)
tcyc
PA0–PA3 interrupt pulse width high (edge-triggered)
tIHIL
1.5
—
tcyc
PA0–PA3 interrupt pulse width (edge- and level-triggered)
tIHIH
1.5
Note(2)
tcyc
tOH, tOL
400
—
ns
OSC1 pulse width
1. VDD = 3.3 Vdc ± 10%, V SS = 0 Vdc, T = –40°C to +105°C, unless otherwise noted
A
2. The maximum width, tILIL or tILIH, should not be more than the number of cycles it takes to execute the interrupt service
routine plus 19 tcyc or the interrupt service routine will be re-entered.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Electrical Specifications
127
Electrical Specifications
tILIL
tILIH
IRQ PIN
tILIH
IRQ1
.
.
.
IRQn
IRQ (INTERNAL)
Figure 10-6. External Interrupt Timing
OSC (NOTE 1)
tRL
RESET
tILIH
IRQ (NOTE 2)
4064 tcyc
IRQ (NOTE 3)
INTERNAL
CLOCK
INTERNAL
ADDRESS BUS
07FE
(NOTE 4)
07FE
07FE
07FE
Notes:
1. Internal clocking from OSC1 pin
2. Edge-triggered external interrupt mask option
3. Edge- and level-triggered external interrupt mask option
4. Reset vector shown as example
07FE
07FF
RESET OR INTERRUPT
VECTOR FETCH
Figure 10-7. Stop Mode Recovery Timing
Technical Data
128
MC68HC705J1A — Rev. 4.0
Electrical Specifications
MOTOROLA
Electrical Specifications
3.3-Volt Control Timing
VDD
(NOTE 1)
4064 tcyc
OSC1 PIN
INTERNAL
CLOCK
INTERNAL
ADDRESS BUS
07FE
07FE
07FE
07FE
07FE
07FE
INTERNAL
DATA BUS
07FF
NEW
PCH
NEW
PCL
Notes:
1. Power-on reset threshold is typically between 1 V and 2 V.
2. Internal clock, internal address bus, and internal data bus are not available externally.
Figure 10-8. Power-On Reset Timing
INTERNAL
CLOCK
INTERNAL
ADDRESS BUS
07FE
INTERNAL
DATA BUS
07FE
07FE
07FE
NEW
PCH
07FF
NEW
PCL
NEW PC
DUMMY
NEW PC
OP
CODE
tRL
Notes:
1. Internal clock, internal address bus, and internal data bus are not available externally.
2. The next rising edge of the internal clock after the rising edge of RESET initiates the reset sequence.
Figure 10-9. External Reset Timing
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Electrical Specifications
129
Electrical Specifications
Technical Data
130
MC68HC705J1A — Rev. 4.0
Electrical Specifications
MOTOROLA
Technical Data — MC68HC705J1A
Section 11. Mechanical Specifications
11.1 Contents
11.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
11.3
Plastic Dual In-Line Package (Case 738) . . . . . . . . . . . . . . . . 132
11.4
Small Outline Integrated Circuit (Case 751) . . . . . . . . . . . . . .132
11.5
Ceramic Dual In-Line Package (Case 732) . . . . . . . . . . . . . . 133
11.2 Introduction
The MC68HC705J1A, the resistor-capacitor (RC) oscillator, and
high-speed option devices described in Appendix A.
MC68HRC705J1A, Appendix B. MC68HSC705J1A, and Appendix C.
MC68HSR705J1A are available in the following packages:
•
738-03 — plastic dual in-line package (PDIP)
•
751D-04 — small outline integrated circuit (SOIC)
•
732-03 — ceramic DIP (cerdip) (windowed)
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Mechanical Specifications
131
Mechanical Specifications
11.3 Plastic Dual In-Line Package (Case 738)
-A20
11
1
10
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD
FLASH.
B
C
-T-
L
K
SEATING
PLANE
M
E
G
N
F
J 20 PL
0.25 (0.010)
D 20 PL
0.25 (0.010)
M
T A
M
M
T B
M
DIM
A
B
C
D
E
F
G
J
K
L
M
N
INCHES
MIN
MAX
1.010 1.070
0.240 0.260
0.150 0.180
0.015 0.022
0.050 BSC
0.050 0.070
0.100 BSC
0.008 0.015
0.110 0.140
0.300 BSC
15°
0°
0.020 0.040
MILLIMETERS
MIN
MAX
25.66 27.17
6.10
6.60
3.81
4.57
0.39
0.55
1.27 BSC
1.27
1.77
2.54 BSC
0.21
0.38
2.80
3.55
7.62 BSC
0°
15°
0.51
1.01
11.4 Small Outline Integrated Circuit (Case 751)
-A20
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.150
(0.006) PER SIDE.
5. DIMENSION D DOES NOT INCLUDE
DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.13
(0.005) TOTAL IN EXCESS OF D DIMENSION
AT MAXIMUM MATERIAL CONDITION.
11
-B-
P 10 PL
0.010 (0.25)
1
M
B
M
10
D
20 PL
0.010 (0.25)
M
T A
S
B
S
J
F
R X 45°
C
-TG
18 PL
K
SEATING
PLANE
M
Technical Data
132
DIM
A
B
C
D
F
G
J
K
M
P
R
MILLIMETERS
MIN
MAX
12.65 12.95
7.40
7.60
2.35
2.65
0.35
0.49
0.50
0.90
1.27 BSC
0.25
0.32
0.10
0.25
0°
7°
10.05 10.55
0.25
0.75
INCHES
MIN
MAX
0.499 0.510
0.292 0.299
0.093 0.104
0.014 0.019
0.020 0.035
0.050 BSC
0.010 0.012
0.004 0.009
0°
7°
0.395 0.415
0.010 0.029
MC68HC705J1A — Rev. 4.0
Mechanical Specifications
MOTOROLA
Mechanical Specifications
Ceramic Dual In-Line Package (Case 732)
11.5 Ceramic Dual In-Line Package (Case 732)
20
11
1
10
NOTES:
1. LEADS WITHIN 0.010 DIAMETER, TRUE
POSITION AT SEATING PLANE, AT MAXIMUM
MATERIAL CONDITION.
2. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
3. DIMENSIONS A AND B INCLUDE MENISCUS.
B
A
L
C
F
N
H
D
G
K
J
M
DIM
A
B
C
D
F
G
H
J
K
L
M
N
INCHES
MIN
MAX
0.940
0.990
0.260
0.295
0.150
0.200
0.015
0.022
0.055
0.065
0.100 BSC
0.020
0.050
0.008
0.012
0.125
0.160
0.300 BSC
0_
15_
0.010
0.040
SEATING
PLANE
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Mechanical Specifications
133
Mechanical Specifications
Technical Data
134
MC68HC705J1A — Rev. 4.0
Mechanical Specifications
MOTOROLA
Technical Data — MC68HC705J1A
Section 11.
Section 12. Ordering Information
12.1 Contents
12.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
12.3
MCU Order Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
12.2 Introduction
This section contains ordering information for the available package
types.
12.3 MCU Order Numbers
Table 12-1 lists the MC order numbers.
Table 12-1. Order Numbers
Package
Type
Case
Outline
Pin
Count
Operating
Temperature
Order Number(1)
MC68HC705J1AP(2)
MC68HC705J1AC (3)P
MC68HC705J1AV(4)P
PDIP
738-03
20
0 to 70°C
–40 to +85°C
–40 to +105°C
SOIC
751D-04
20
0 to 70°C
–40 to +85°C
–40 to +105°C
MC68HC705J1ADW (5)
MC68HC705J1ACDW
MC68HC705J1AVDW
Cerdip
732-03
20
0 to 70°C
–40 to +85°C
–40 to +105°C
MC68HC705J1AS(6)
MC68HC705J1ACS
MC68HC705J1AVS
1. Refer to Appendix A. MC68HRC705J1A, Appendix B. MC68HSC705J1A, and
Appendix C. MC68HSR705J1A for ordering information on optional high-speed and
resistor-capacitor oscillator devices.
2. P = Plastic dual in-line package (PDIP)
3. C = Extended temperature range
4. V = Automotive temperature range
5. DW = Small outline integrated circuit (SOIC)
6. S = Ceramic dual in-line package (cerdip)
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
135
Ordering Information
Technical Data
136
MC68HC705J1A — Rev. 4.0
Ordering Information
MOTOROLA
Technical Data — MC68HC705J1A
Appendix A. MC68HRC705J1A
A.1 Contents
A.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
A.3
RC Oscillator Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
A.4
Typical Internal Operating Frequency
for RC Oscillator Option. . . . . . . . . . . . . . . . . . . . . . . . . . . 139
A.5
Package Types and Order Numbers . . . . . . . . . . . . . . . . . . . 140
A.2 Introduction
This appendix introduces the MC68HRC705J1A, a resistor-capacitor
(RC) oscillator mask option version of the MC68HC705J1A. All of the
information in this document applies to the MC68HRC705J1A with the
exceptions given in this appendix.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
MC68HRC705J1A
137
MC68HRC705J1A
A.3 RC Oscillator Connections
For greater cost reduction, the RC oscillator mask option allows the
configuration shown in Figure A-1 to drive the on-chip oscillator. Mount
the RC components as close as possible to the pins for startup
stabilization and to minimize output distortion.
OSC1
R
OSC2
R
OSC2
OSC1
MCU
VDD
C2
C1
VSS
Figure A-1. RC Oscillator Connections
NOTE:
The optional internal resistor is not recommended for configurations that
use the RC oscillator connections as shown in Figure A-1. For such
configurations, the oscillator internal resistor (OSCRES) bit of the mask
option register should be programmed to a logic 0.
Technical Data
138
MC68HC705J1A — Rev. 4.0
MC68HRC705J1A
MOTOROLA
MC68HRC705J1A
Typical Internal Operating Frequency for RC Oscillator Option
A.4 Typical Internal Operating Frequency for RC Oscillator Option
Figure A-2 shows typical internal operating frequencies at 25°C for the
RC oscillator option.
NOTE:
Tolerance for resistance is ±50%. When selecting resistor size, consider
the tolerance to ensure that the resulting oscillator frequency does not
exceed the maximum operating frequency.
10
FREQUENCY (MHz)
1
3.0 V
3.6 V
4.5 V
5.0 V
5.5 V
0.1
0.01
1
10
100
1000
10000
RESISTANCE (kΩ)
Figure A-2. Typical Internal Operating Frequency
for Various VDD at 25°C — RC Oscillator Option Only
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
MC68HRC705J1A
139
MC68HRC705J1A
A.5 Package Types and Order Numbers
Table A-1. MC68HRC705J1A (RC Oscillator Option)
Order Numbers
Package
Type
PDIP
Case
Outline
738-03
Pin
Count
Operating
Temperature
20
0 to 70°C
–40 to +85°C
–40 to +105°C
MC68HRC705J1AP(2)
MC68HRC705J1AC (3)P
MC68HRC705J1AV(4)P
MC68HRC705J1ADW (5)
MC68HRC705J1ACDW
MC68HRC705J1AVDW
MC68HRC705J1AS(6)
MC68HRC705J1ACS
MC68HRC705J1AVS
SOIC
751D-04
20
0 to 70°C
–40 to +85°C
–40 to +105°C
Cerdip
732-03
20
0 to 70°C
–40 to +85°C
–40 to +105°C
Order Number(1)
1. Refer to Section 12. Ordering Information for standard part ordering information.
2. P = plastic dual in-line package (PDIP)
3. C = extended temperature range
4. V = automotive temperature range
5. DW = small outline integrated circuit (SOIC)
6. S = ceramic dual in-line package (cerdip)
Technical Data
140
MC68HC705J1A — Rev. 4.0
MC68HRC705J1A
MOTOROLA
Technical Data — MC68HC705J1A
Appendix B. MC68HSC705J1A
B.1 Contents
B.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
B.3
5.0-Volt DC Electrical Characteristics. . . . . . . . . . . . . . . . . . .142
B.4
3.3-Volt DC Electrical Characteristics. . . . . . . . . . . . . . . . . . .142
B.5
Typical Supply Currents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
B.6
Package Types and Order Numbers . . . . . . . . . . . . . . . . . . . 144
B.2 Introduction
This appendix introduces the MC68HSC705J1A, a high-speed version
of the MC68HC705J1A. All of the information in this document applies to
the MC68HSC705J1A with the exceptions given in this appendix.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
MC68HSC705J1A
141
MC68HSC705J1A
B.3 5.0-Volt DC Electrical Characteristics
Characteristic
Symbol
Min
Typ
Max
Unit
IDD
—
4.25
0.57
7.0
3.25
mA
Symbol
Min
Typ
Max
Unit
IDD
—
1.4
0.28
4.25
1.75
mA
Supply current (fOP = 4.0 MHz)
Run
Wait
B.4 3.3-Volt DC Electrical Characteristics
Characteristic
Supply current (fOP = 2.1 MHz)
Run
Wait
B.5 Typical Supply Currents
7.0 mA
SEE NOTE 1
6.0 mA
5.5 V
SUPPLY CURRENT (IDD)
5.0 mA
SEE NOTE 2
4.0 mA
4.5 V
3.0 mA
2.0 mA
3.6 V
3.0 V
1.0 mA
0
0
1.0 MHz
2.0 MHz
3.0 MHz
4.0 MHz
INTERNAL OPERATING FREQUENCY (fOP)
Notes:
1. At V DD = 5.0 V, high-speed devices are specified and tested for
IDD ≤ 7.0 mA @ fOP = 4.0 MHz.
2. At V DD = 3.3 V, high-speed devices are specified and tested for
IDD ≤ 4.25 mA @ fOP = 2.1 MHz.
Figure B-1. Typical High-Speed Operating IDD (25°C)
Technical Data
142
MC68HC705J1A — Rev. 4.0
MC68HSC705J1A
MOTOROLA
MC68HSC705J1A
Typical Supply Currents
SEE NOTE 1
SEE NOTE 2
700 µA
5.5 V
SUPPLY CURRENT (IDD)
600 µA
4.5 V
500 µA
400 µA
3.6 V
300 µA
3.0 V
200 µA
100 µA
0
0
1.0 MHz
2.0 MHz
3.0 MHz
4.0 MHz
INTERNAL OPERATING FREQUENCY (fOP)
Notes:
1. At VDD = 5.0 V, high-speed devices are specified and tested for
IDD ≤ 3.25 mA @ fOP = 4.0 MHz.
2. At VDD = 3.3 V, high-speed devices are specified and tested for
IDD ≤ 1.75 mA @ fOP = 2.1 MHz.
Figure B-2. Typical High-Speed Wait Mode IDD (25°C)
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
MC68HSC705J1A
143
MC68HSC705J1A
B.6 Package Types and Order Numbers
Table B-1. MC68HSC705J1A (High Speed) Order Numbers
Package
Type
Case
Outline
Pin
Count
Operating
Temperature
PDIP
738-03
20
0 to 70°C
–40 to +85°C
MC68HSC705J1AP(2)
MC68HSC705J1AC(3)P
SOIC
751D-04
20
0 to 70°C
–40 to +85°C
MC68HSC705J1ADW (4)
MC68HSC705J1ACDW
Cerdip
732-03
20
0 to 70°C
–40 to +85°C
MC68HSC705J1AS(5)
MC68HSC705J1ACS
Order Number(1)
1. Refer to Section 12. Ordering Information for standard part ordering information.
2. P = plastic dual in-line package (PDIP)
3. C = extended temperature range
4. DW = small outline integrated circuit (SOIC)
5. S = ceramic dual in-line package (cerdip)
Technical Data
144
MC68HC705J1A — Rev. 4.0
MC68HSC705J1A
MOTOROLA
Technical Data — MC68HC705J1A
Appendix C. MC68HSR705J1A
C.1 Contents
C.2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
C.3
RC Oscillator Connections (External Resistor). . . . . . . . . . . . 145
C.4
Typical Internal Operating Frequency at 25°C
for High-Speed RC Oscillator Option. . . . . . . . . . . . . . . . . 146
C.5
RC Oscillator Connections (No External Resistor) . . . . . . . . .147
C.6
Typical Internal Operating Frequency versus Temperature
(No External Resistor) . . . . . . . . . . . . . . . . . . . . . . . . . . . .148
C.7
Package Types and Order Numbers . . . . . . . . . . . . . . . . . . . 149
C.2 Introduction
This appendix introduces the MC68HSR705J1A, a high-speed version
of the MC68HRC705J1A. All of the information in this document applies
to the MC68HSR705J1A with the exceptions given in this appendix.
C.3 RC Oscillator Connections (External Resistor)
Refer to Appendix A. MC68HRC705J1A for a description of the
resistor-capacitor (RC) oscillator connections with external resistor.
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
MC68HSR705J1A
145
MC68HSR705J1A
C.4 Typical Internal Operating Frequency at 25°C
for High-Speed RC Oscillator Option
10
3.0 V
3.6 V
FREQUENCY (MHz)
4.5 V
5.0 V
5.5 V
1
10
1
100
RESISTANCE (kΩ)
Figure C-1. Typical Internal Operating Frequency
at 25°C for High-Speed RC Oscillator Option
For lower frequency operation characteristics, refer to Appendix A.
MC68HRC705J1A.
NOTE:
Tolerance for resistance is ±50 percent. When selecting resistor size,
consider the tolerance to ensure that resulting oscillator frequency does
not exceed the maximum operating frequency.
Technical Data
146
MC68HC705J1A — Rev. 4.0
MC68HSR705J1A
MOTOROLA
MC68HSR705J1A
RC Oscillator Connections (No External Resistor)
C.5 RC Oscillator Connections (No External Resistor)
For maximum cost reduction, the RC oscillator mask connections shown
in Figure C-2 allow the on-chip oscillator to be driven with no external
components. This can be accomplished by programming the oscillator
internal resistor (OSCRES) bit in the mask option register to a logic 1.
When programming the OSCRES bit for the MC68HSR705J1A, an
internal resistor is selected which yields typical internal oscillator
frequencies as shown in Figure C-3. The internal resistance for this
device is different than the resistance of the selectable internal resistor
on the MC68HC705J1A and the MC68HSC705J1A devices.
NOTE:
This option is not available on the ROM version of this device
(MC68HC05J1A).
OSC1
R
OSC2
OSC2
OSC1
MCU
VDD
C2
EXTERNAL CONNECTIONS LEFT OPEN
C1
VSS
Figure C-2. RC Oscillator Connections (No External Resistor)
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
MC68HSR705J1A
147
MC68HSR705J1A
C.6 Typical Internal Operating Frequency versus Temperature
(No External Resistor)
3.00
FREQUENCY (MHz)
2.50
2.00
3.0 V
3.6 V
4.5 V
5.0 V
1.50
5.5 V
1.00
0.50
0.00
–50
0
50
100
150
TEMPERATURE (°C)
Figure C-3. Typical Internal Operating Frequency
versus Temperature (OSCRES Bit = 1)
NOTE:
Due to process variations, operating voltages, and temperature
requirements, the internal resistance and tolerance are unspecified.
Typically for a given voltage and temperature, the frequency should not
vary more than ±500 kHz. However, this data is not guaranteed. It is the
user’s responsibility to ensure that the resulting internal operating
frequency meets the user’s requirements.
Technical Data
148
MC68HC705J1A — Rev. 4.0
MC68HSR705J1A
MOTOROLA
MC68HSR705J1A
Package Types and Order Numbers
C.7 Package Types and Order Numbers
Table C-1. MC68HSR705J1A (High-Speed
RC Oscillator Option) Order Numbers(1)
Package
Type
Case
Outline
Pin
Count
Operating
Temperature
PDIP
738-03
20
0 to 70°C
–40 to +85°C
MC68HSR705J1AP(2)
MC68HSR705J1AC(3)P
SOIC
751D-04
20
0 to 70°C
–40 to +85°C
MC68HSR705J1ADW (4)
MC68HSR705J1ACDW
Cerdip
732-03
20
0 to 70°C
–40 to +85°C
MC68HSR705J1AS(5)
MC68HSR705J1ACS
Order Number
1. Refer to Section 12. Ordering Information for standard part ordering information.
2. P = plastic dual in-line package (PDIP)
3. C = extended temperature range
4. DW = small outline integrated circuit (SOIC)
5. S = ceramic dual in-line package (cerdip)
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
MC68HSR705J1A
149
MC68HSR705J1A
Technical Data
150
MC68HC705J1A — Rev. 4.0
MC68HSR705J1A
MOTOROLA
Technical Data — MC68HC705J1A
Index
A
accumulator register (A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
addressing modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
B
block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
brownout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
C
C bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
central processor unit (CPU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
computer operating properly (COP) module . . . . . . . . . . . . . . . . . . . 97
condition code register (CCR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
COP watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
COP in stop mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
COP in wait mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
COP register (COPR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
COP reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
programmable option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
COPEN bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
instruction set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
instruction set summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
instruction types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
opcode map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
programming model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Index
151
Index
CPU registers
accumulator register (A). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
index register (X) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
program counter register (PC) . . . . . . . . . . . . . . . . . . . . . . . . . . .
stack pointer register (SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
48
48
50
49
D
data direction registers
data direction register A (DDRA) . . . . . . . . . . . . . . . . . . . . . . . . . 90
data direction register B (DDRB) . . . . . . . . . . . . . . . . . . . . . . . . . 93
data-retention mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
E
ELAT bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
control timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126, 127
DC electrical characteristics. . . . . . . . . . . . . . . . . . . . . . . . 121, 122
driver characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
MC68HSC705J1A (high-speed option) . . . . . . . . . . . . . . . . . . . 142
MC68HSR705J1A (high-speed RC oscillator option) . . . . . . . . 145
operating temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
power considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
thermal resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
typical supply currents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
electrostatic damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
EPGM bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
EPMSEC bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
EPROM
EPROM security programmable option . . . . . . . . . . . . . . . . . . . . 25
EPROM/OTPROM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
erasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38, 40
programming characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
programming register (EPROG). . . . . . . . . . . . . . . . . . . . . . . . . . 39
Technical Data
152
MC68HC705J1A — Rev. 4.0
Index
MOTOROLA
Index
external interrupt module (IRQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
external interrupt pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
external reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
G
general description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
H
H bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
I
I bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
index register (X) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
instruction set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
addressing modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
instruction set summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
instruction types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
opcode map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
instruction types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
interrupts
external interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73, 74
external interrupt logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
external interrupt module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
external interrupt timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75, 107
external interrupt vector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
interrupt flowchart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78, 103
interrupt processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
interrupt sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
interrupt stacking order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
IRQ module block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
IRQ status and control register (ISCR) . . . . . . . . . . . . . . . . . . . 106
IRQ/VPP pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101, 104
operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
optional external interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
pin sensitivity selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
pin triggering option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
port A external interrupts programmable option. . . . . . . . . . . . . . 25
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Index
153
Index
real-time interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
reset/interrupt vector addresses. . . . . . . . . . . . . . . . . . . . . . . . . . 77
software interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
software interrupt vector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
sources. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
timer interrupt vector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
timer interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76, 112
timer overflow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
IRQ latch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
IRQ/VPP pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31, 98, 104
IRQE bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
IRQF bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
IRQR bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
J
junction temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
L
LEVEL bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
COP timeout period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
data-retention mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80, 84
effects on clock generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
effects on COP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
effects on CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
effects on EPROM/OTPROM. . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
effects on timer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
exiting stop mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
exiting wait mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
flowchart (STOP/HALT/WAIT) . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
halt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
STOP instruction flowchart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
stop mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79, 82
stop recovery timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
timing of stop mode recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
wait mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Technical Data
154
MC68HC705J1A — Rev. 4.0
Index
MOTOROLA
Index
M
mask option register (MOR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
MC68HC705J1A
features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
MC68HRC705J1A (RC oscillator option) . . . . . . . . . . . . . . . . . . . . 137
operating frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
order numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
package types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
RC oscillator connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
MC68HSC705J1A (high-speed option) . . . . . . . . . . . . . . . . . . . . . . 141
DC electrical characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
order numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
package types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
typical operating current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
typical wait mode current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
MC68HSR705J1A (high-speed RC oscillator option) . . . . . . . . . . . 145
operating frequencies (with OSCRES bit set) . . . . . . . . . . . . . . 148
operating frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
order numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
package types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
RC oscillator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
RC oscillator connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
EPROM/OTPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
EPROM/OTPROM programming . . . . . . . . . . . . . . . . . . . . . . . . . 38
features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
I/O register summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
mask option register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
memory map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
MPGM bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
multifunction timer module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
N
N bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Index
155
Index
O
opcode map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
options (mask) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
options (programmable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
ordering information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
MC68HRC705J1A (RC oscillator option) . . . . . . . . . . . . . . . . . . 140
MC68HSC705J1A (high-speed option) . . . . . . . . . . . . . . . . . . . 144
MC68HSR705J1A (high-speed RC oscillator option) . . . . . . . . 149
order numbers . . . . . . . . . . . . . . . . . . . . . . . . . . 135, 140, 144, 149
OSC1 pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
OSC2 pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
oscillator
crystal oscillator internal resistor option . . . . . . . . . . . . . . . . . . . . 25
delay counter programmable option. . . . . . . . . . . . . . . . . . . . . . . 25
on-chip oscillator stabilization delay. . . . . . . . . . . . . . . . . . . . . . . 71
pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
OSCRES bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
P
PA0–PA3 pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
package types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
parallel input/output (I/O) ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
pin assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
PIRQ bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
port A
data direction register (DDRA) . . . . . . . . . . . . . . . . . . . . . . . . . . .
data register (PORTA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O pin interrupts (PA0–PA3) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LED drive capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
pin operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
pulldown register (PDRA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
port B
data direction register (DDRB) . . . . . . . . . . . . . . . . . . . . . . . . . . .
electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data
156
42
90
89
95
90
92
92
91
31
91
93
95
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MOTOROLA
Index
I/O circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
pin operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
pins. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
port B data register (PORTB). . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
pulldown register (PDRB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
power dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
power-on reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
program counter (PC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
programmable options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
programming model (CPU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
pulldown register A (PDRA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
pulldown register B (PDRB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
pulldown resistors
programmable option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
R
RAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
stack RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
registers
CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
I/O register summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
parallel I/O port register summary . . . . . . . . . . . . . . . . . . . . . . . . 88
RESET pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30, 72
resets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
COP register (COPR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
COP watchdog reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
external reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
external reset timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
illegal address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
power-on reset (POR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
power-on reset timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
reset sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
reset/interrupt vector addresses. . . . . . . . . . . . . . . . . . . . . . . . . . 77
resistors (pulldown)
programmable option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
RT1, RT0 bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
MC68HC705J1A — Rev. 4.0
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Technical Data
Index
157
Index
RTIE bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
RTIF bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
RTIFR bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
S
Schmitt trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31, 104, 105
SOSCD bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
stack pointer register (SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
STOP instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81, 100, 106
stop mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82, 100
effect on COP watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
effects on timer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
STOP instruction flowchart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
stop recovery timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
stop/halt mode programmable option . . . . . . . . . . . . . . . . . . . . . . . . 25
SWAIT bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
SWPDI bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
T
thermal resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
timer
block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
I/O registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76, 112
low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
timer counter register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
timer interrupt vector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
timer status and control register (TSCR) . . . . . . . . . . . . . . . . . . 112
TOF bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
TOFR bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
TOIE bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Technical Data
158
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Index
MOTOROLA
Index
V
VDD pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
VSS pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
W
WAIT instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81, 100, 106
wait mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
effects on timer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Z
Z bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
MC68HC705J1A — Rev. 4.0
MOTOROLA
Technical Data
Index
159
Index
Technical Data
160
MC68HC705J1A — Rev. 4.0
Index
MOTOROLA
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suitability of its products for any particular purpose, nor does Motorola assume any
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MC68HC705J1A/D