STMICROELECTRONICS ST62E65CF1

ST62T55CM-Auto
ST62T65CM-Auto
8-BIT OTP/EPROM/FASTROM MCUs WITH A/D CONVERTER,
SAFE RESET, AUTO-RELOAD TIMER, EEPROM AND SPI
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3.0 to 6.0V Supply Operating Range
8 MHz Maximum Clock Frequency
-40 to +125°C Operating Temperature Range
Run, Wait and Stop Modes
5 Interrupt Vectors
Look-up Table capability in Program Memory
Data Storage in Program Memory:
User selectable size
Data RAM: 128 bytes
Data EEPROM: 128 bytes (none on ST62T55C)
User Programmable Options (OTP and EPROM
only)
21 I/O pins, fully programmable as:
– Input with pull-up resistor
– Input without pull-up resistor
– Input with interrupt generation
– Open-drain or push-pull output
– Analog Input
8 I/O lines can sink up to 30mA to drive LEDs or
TRIACs directly
8-bit Timer / Counter with 7-bit programmable
prescaler
8-bit Auto-reload Timer with 7-bit programmable
prescaler (AR Timer)
Digital Watchdog
Oscillator Safe Guard
Low Voltage Detector for Safe Reset
PS028
CDIP28W
(See end of Datasheet for Ordering Information)
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8-bit A/D Converter with 13 analog inputs
8-bit Synchronous Peripheral Interface (SPI)
On-chip Clock oscillator can be driven by Quartz
Crystal Ceramic resonator or RC network
User configurable Power-on Reset
One external Non-Maskable Interrupt
ST626x-EMU2 Emulation and Development
System (connects to an MS-DOS PC via a
parallel port)
DEVICE SUMMARY
DEVICE1)
OTP
EPROM (Bytes)
EEPROM
FASTROM (Bytes)
ST62T55CM-Auto
3884
-
-
ST62T65CM-Auto
3884
-
128
ST62E65C
-
ST62P55CM-Auto
-
ST62P65CM-Auto
-
3884
-
128
64
1836
1836
Note:
1. T = One-time programmable; E = EPROM/EEPROM; P = FASTROM
Rev. 1
Nov 2007
1/79
Table of Contents
Document
Page
ST62T55CM-Auto, ST62T65CM-Auto . . . . . . . . . . . . . . . . . . . . 1
1 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 PIN DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 MEMORY MAP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3.2 Program Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3.3 Data Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3.4 Stack Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3.5 Data Window Register (DWR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.3.6 Data RAM/EEPROM Bank Register (DRBR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.3.7 EEPROM Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.4 PROGRAMMING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.4.1 Option Bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4.2 EPROM Erasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 CENTRAL PROCESSING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
14
15
15
2.2 CPU REGISTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3 CLOCKS, RESET, INTERRUPTS AND POWER SAVING MODES . . . . . . . . . . . . . . . . . . . . . 17
3.1 CLOCK SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1.1 Main Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.2 Low Frequency Auxiliary Oscillator (LFAO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.3 Oscillator Safe Guard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 RESETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
18
18
22
3.2.1 RESET Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.2 Power-on Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.3 Watchdog Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.4 LVD Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.5 Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.6 MCU Initialization Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 DIGITAL WATCHDOG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
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23
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24
26
3.3.1 Digital Watchdog Register (DWDR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.3.2 Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.4 INTERRUPTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.4.1 Interrupt request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.2 Interrupt Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.3 Interrupt Option Register (IOR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.4 Interrupt sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5 POWER SAVING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
31
32
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34
3.5.1 WAIT Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5.2 STOP Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5.3 Exit from WAIT and STOP Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 ON-CHIP PERIPHERALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 I/O PORTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
....
34
34
35
36
36
4.1.1 Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.1.2 Safe I/O State Switching Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
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4.1.3 Timer 1 Alternate function Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.4 AR Timer Alternate function Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1.5 SPI Alternate function Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 TIMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
40
40
40
42
4.2.1 Timer Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.2 Timer Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.3 Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2.4 Timer Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 AUTO-RELOAD TIMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43
43
44
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45
4.3.1 AR Timer Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.2 Timer Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3.3 AR Timer Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4 A/D CONVERTER (ADC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
45
45
49
51
4.4.1 Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
4.5 SERIAL PERIPHERAL INTERFACE (SPI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.5.1 SPI Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
4.6 SPI TIMING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
5 SOFTWARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
5.1 ST6 ARCHITECTURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
5.2 ADDRESSING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
5.3 INSTRUCTION SET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
6 ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6.1 ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6.2 RECOMMENDED OPERATING CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.3 DC ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
6.4 AC ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
6.5 A/D CONVERTER CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
6.6 TIMER CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
6.7 SPI CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
6.8 ARTIMER ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
7 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
7.1 PACKAGE MECHANICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
7.2 SOLDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
7.3 OTP/EPROM VERSION ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
7.4 IMPORTANT NOTE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
7.5 FASTROM VERSION GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
7.6 FASTROM VERSION ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
7.6.1 Transfer of Customer Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
7.6.2 Listing Generation and Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
8 SUMMARY OF CHANGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
79
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ST62T55CM-Auto ST62T65CM-Auto
1 GENERAL DESCRIPTION
1.1 INTRODUCTION
The ST62T55C, ST62T65C and ST62E65C devices are low cost members of the ST62xx 8-bit HCMOS family of microcontrollers, which is targeted
at low to medium complexity applications. All
ST62xx devices are based on a building block approach: a common core is surrounded by a
number of on-chip peripherals.
The ST62E65C is the erasable EPROM version of
the ST62T65C device, which may be used to emulate the ST62T55C and ST62T65C device, as
well as the respective ST6255C and ST6265C
ROM devices.
OTP and EPROM devices are functionally identical. The ROM based versions offer the same functionality selecting as ROM options the options de-
fined in the programmable option byte of the OTP/
EPROM versions.
OTP devices offer all the advantages of user programmability at low cost, which make them the
ideal choice in a wide range of applications where
frequent code changes, multiple code versions or
last minute programmability are required.
These compact low-cost devices feature a Timer
comprising an 8-bit counter and a 7-bit programmable prescaler, an 8-bit Auto-Reload Timer,
EEPROM data capability (except ST62T55C), a
serial port communication interface, an 8-bit A/D
Converter with 13 analog inputs and a Digital
Watchdog timer, making them well suited for a
wide range of automotive, appliance and industrial
applications.
Figure
1. Block Diagram
j
8-BIT
A/D CONVERTER
TEST/VPP
NMI
PORT A
PA0..PA7 / Ain
PORT B
PB0..PB5 / 30 mA Sink
PB6 / ARTimin / 30 mA Sink
PB7 / ARTimout / 30 mA Sink
TEST
INTERRUPT
DATA ROM
USER
SELECTABLE
PORT C
PROGRAM
MEMORY
DATA RAM
3884 bytes
(ST62T55C, T65C,
E65C)
128 Bytes
DATA EEPROM
AUTORELOAD
TIMER
TIMER
128 Bytes
(ST62T65C/E65C)
SPI (SERIAL
PERIPHERAL
INTERFACE)
PC
STACK LEVEL 1
STACK LEVEL 2
STACK LEVEL 3
STACK LEVEL 4
STACK LEVEL 5
STACK LEVEL 6
4/79
8 BIT CORE
POWER
SUPPLY
OSCILLATOR
RESET
VDD VSS
OSCin OSCout
RESET
DIGITAL
WATCHDOG
PC0 / Ain
PC1 / Tim1 / Ain
PC2 / Sin / Ain
PC3 / Sout / Ain
PC4 / Sck / Ain
ST62T55CM-Auto ST62T65CM-Auto
1.2 PIN DESCRIPTIONS
VDD and VSS. Power is supplied to the MCU via
these two pins. VDD is the power connection and
VSS is the ground connection.
OSCin and OSCout. These pins are internally
connected to the on-chip oscillator circuit. A quartz
crystal, a ceramic resonator or an external clock
signal can be connected between these two pins.
The OSCin pin is the input pin, the OSCout pin is
the output pin.
RESET. The active-low RESET pin is used to restart the microcontroller.
TEST/VPP. The TEST must be held at VSS for normal operation. If TEST pin is connected to a
+12.5V level during the reset phase, the EPROM/
OTP programming Mode is entered.
NMI. The NMI pin provides the capability for asynchronous interruption, by applying an external non
maskable interrupt to the MCU. The NMI input is
falling edge sensitive. It is provided with an on-chip
pullup resistor (if option has been enabled), and
Schmitt trigger characteristics.
PA0-PA7. These 8 lines are organized as one I/O
port (A). Each line may be configured under software control as inputs with or without internal pullup resistors, interrupt generating inputs with pullup resistors, open-drain or push-pull outputs, analog inputs for the A/D converter.
PB0-PB5. These 6 lines are organized as one I/O
port (B). Each line may be configured under software control as inputs with or without internal pullup resistors, interrupt generating inputs with pullup resistors, open-drain or push-pull outputs.
PB0-PB5 can also sink 30mA for direct LED
driving.
PB6/ARTIMin, PB7/ARTIMout. These pins are either Port B I/O bits or the Input and Output pins of
the AR TIMER. To be used as timer input function
PB6 has to be programmed as input with or without pull-up. A dedicated bit in the AR TIMER Mode
Control Register sets PB7 as timer output function.
PB6-PB7 can also sink 30mA for direct LED driving.
PC0-PC4. These 5 lines are organized as one I/O
port (C). Each line may be configured under software control as input with or without internal pullup resistor, interrupt generating input with pull-up
resistor, analog input for the A/D converter, opendrain or push-pull output.
PC1 can also be used as Timer I/O bit while
PC2-PC4 can also be used as respectively Data
in, Data out and Clock I/O pins for the on-chip SPI
to carry the synchronous serial I/O signals.
Figure 2. ST62T55C, T65C, E65C Pin
Configuration
PB0
PB1
VPP/TEST
PB2
PB3
PB4
PB5
ARTIMin/PB6
ARTIMout/PB7
Ain / PA0
VDD
VSS
Ain/PA1
Ain/PA2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
PC0/Ain
PC1/TIM1/Ain
PC2/Sin/Ain
PC3/Sout/Ain
PC4/Sck/Ain
NMI
RESET
OSCout
OSCin
PA7/Ain
PA6/Ain
PA5/Ain
PA4/Ain
PA3/Ain
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ST62T55CM-Auto ST62T65CM-Auto
1.3 MEMORY MAP
1.3.1 Introduction
The MCU operates in three separate memory
spaces: Program space, Data space, and Stack
space. Operation in these three memory spaces is
described in the following paragraphs.
Briefly, Program space contains user program
code in OTP and user vectors; Data space contains user data in RAM and in OTP, and Stack
space accommodates six levels of stack for subroutine and interrupt service routine nesting.
Figure 3Memory Addressing Diagram
PROGRAM SPACE
DATA SPACE
0000h
000h
RAM / EEPROM
BANKING AREA
0-63
PROGRAM
MEMORY
03Fh
040h
DATA READ-ONLY
MEMORY WINDOW
07Fh
080h
081h
082h
083h
084h
DATA READ-ONLY
MEMORY
WINDOW SELECT
DATA RAM
BANK SELECT
0FFh
ACCUMULATOR
INTERRUPT &
RESET VECTORS
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RAM
0C0h
0FF0h
0FFFh
X REGISTER
Y REGISTER
V REGISTER
W REGISTER
ST62T55CM-Auto ST62T65CM-Auto
MEMORY MAP (Cont’d)
1.3.2 Program Space
Program Space comprises the instructions to be
executed, the data required for immediate addressing mode instructions, the reserved factory
test area and the user vectors. Program Space is
addressed via the 12-bit Program Counter register
(PC register).
1.3.2.1 Program Memory Protection
The Program Memory in OTP or EPROM devices
can be protected against external readout of memory by selecting the READOUT PROTECTION option in the option byte.
In the EPROM parts, READOUT PROTECTION
option can be disactivated only by U.V. erasure
that also results into the whole EPROM context
erasure.
Note: Once the Readout Protection is activated, it
is no longer possible, even for STMicroelectronics,
to gain access to the OTP contents. Returned
parts with a protection set can therefore not be accepted.
Figure 4.ST62T55C/T65C/E65C Program
Memory Map
0000h
RESERVED*
007Fh
0080h
USER
PROGRAM MEMORY
(OTP/EPROM)
3872 BYTES
0F9Fh
0FA0h
0FEFh
0FF0h
0FF7h
0FF8h
0FFBh
0FFCh
0FFDh
0FFEh
0FFFh
RESERVED*
INTERRUPT VECTORS
RESERVED
NMI VECTOR
USER RESET VECTOR
(*) Reserved areas should be filled with 0FFh
7/79
ST62T55CM-Auto ST62T65CM-Auto
MEMORY MAP (Cont’d)
1.3.3 Data Space
Data Space accommodates all the data necessary
for processing the user program. This space comprises the RAM resource, the processor core and
peripheral registers, as well as read-only data
such as constants and look-up tables in OTP/
EPROM.
1.3.3.1 Data ROM
All read-only data is physically stored in program
memory, which also accommodates the Program
Space. The program memory consequently contains the program code to be executed, as well as
the constants and look-up tables required by the
application.
The Data Space locations in which the different
constants and look-up tables are addressed by the
processor core may be thought of as a 64-byte
window through which it is possible to access the
read-only data stored in OTP/EPROM.
1.3.3.2 Data RAM/EEPROM
In ST6255CM-Auto, ST6265CM-Auto devices, the
data space includes 60 bytes of RAM, the accumulator (A), the indirect registers (X), (Y), the short
direct registers (V), (W), the I/O port registers, the
peripheral data and control registers, the interrupt
option register and the Data ROM Window register
(DRW register).
Additional RAM and EEPROM pages can also be
addressed using banks of 64 bytes located between addresses 00h and 3Fh.
1.3.4 Stack Space
Stack space consists of six 12-bit registers which
are used to stack subroutine and interrupt return
addresses, as well as the current program counter
contents.
Table 1. Additional RAM/EEPROM Banks
Device
ST62T55C
ST62T65C/E65C
RAM
1 x 64 bytes
1 x 64 bytes
EEPROM
2 x 64 bytes
Table 2. ST6255CM-Auto, ST6265CM-Auto Data
Memory Space
RAM and EEPROM
DATA ROM WINDOW AREA
X REGISTER
Y REGISTER
V REGISTER
W REGISTER
DATA RAM 60 BYTES
PORT A DATA REGISTER
PORT B DATA REGISTER
PORT C DATA REGISTER
RESERVED
PORT A DIRECTION REGISTER
PORT B DIRECTION REGISTER
PORT C DIRECTION REGISTER
RESERVED
INTERRUPT OPTION REGISTER
DATA ROM WINDOW REGISTER
RESERVED
PORT A OPTION REGISTER
PORT B OPTION REGISTER
PORT C OPTION REGISTER
RESERVED
A/D DATA REGISTER
A/D CONTROL REGISTER
TIMER PRESCALER REGISTER
TIMER COUNTER REGISTER
TIMER STATUS CONTROL REGISTER
AR TIMER MODE CONTROL REGISTER
AR TIMER STATUS/CONTROL REGISTER1
AR TIMER STATUS/CONTROL REGISTER2
WATCHDOG REGISTER
AR TIMER RELOAD/CAPTURE REGISTER
AR TIMER COMPARE REGISTER
AR TIMER LOAD REGISTER
OSCILLATOR CONTROL REGISTER
MISCELLANEOUS
RESERVED
SPI DATA REGISTER
SPI DIVIDER REGISTER
SPI MODE REGISTER
RESERVED
DATA RAM/EEPROM REGISTER
RESERVED
EEPROM CONTROL REGISTER
RESERVED
ACCUMULATOR
* WRITE ONLY REGISTER
8/79
000h
03Fh
040h
07Fh
080h
081h
082h
083h
084h
0BFh
0C0h
0C1h
0C2h
0C3h
0C4h
0C5h
0C6h
0C7h
0C8h*
0C9h*
0CAh
0CBh
0CCh
0CDh
0CEh
0CFh
0D0h
0D1h
0D2h
0D3h
0D4h
0D5h
0D6h
0D7h
0D8h
0D9h
0DAh
0DBh
0DCh*
0DDh
0DEh
0DFh
0E0h
0E1h
0E2h
0E3h
0E7h
0E8h*
0E9h
0EAh
0EBh
0FEh
0FFh
ST62T55CM-Auto ST62T65CM-Auto
MEMORY MAP (Cont’d)
1.3.5 Data Window Register (DWR)
The Data read-only memory window is located from
address 0040h to address 007Fh in Data space. It
allows direct reading of 64 consecutive bytes located anywhere in program memory, between address 0000h and 0FFFh (top memory address depends on the specific device). All the program
memory can therefore be used to store either instructions or read-only data. Indeed, the window
can be moved in steps of 64 bytes along the program memory by writing the appropriate code in the
Data Window Register (DWR).
The DWR can be addressed like any RAM location
in the Data Space, it is however a write-only register and therefore cannot be accessed using singlebit operations. This register is used to position the
64-byte read-only data window (from address 40h
to address 7Fh of the Data space) in program
memory in 64-byte steps. The effective address of
the byte to be read as data in program memory is
obtained by concatenating the 6 least significant
bits of the register address given in the instruction
(as least significant bits) and the content of the
DWR register (as most significant bits), as illustrated in Figure 5 below. For instance, when addressing location 0040h of the Data Space, with 0 loaded in the DWR register, the physical location addressed in program memory is 00h. The DWR register is not cleared on reset, therefore it must be
written to prior to the first access to the Data readonly memory window area.
Data Window Register (DWR)
Address: 0C9h — Write Only
7
0
-
-
DWR5 DWR4 DWR3 DWR2 DWR1 DWR0
Bits 6, 7 = Not used.
Bit 5-0 = DWR5-DWR0: Data read-only memory
Window Register Bits. These are the Data readonly memory Window bits that correspond to the
upper bits of the data read-only memory space.
Caution: This register is undefined on reset. Neither read nor single bit instructions may be used to
address this register.
Note: Care is required when handling the DWR
register as it is write only. For this reason, the
DWR contents should not be changed while executing an interrupt service routine, as the service
routine cannot save and then restore the register’s
previous contents. If it is impossible to avoid writing to the DWR during the interrupt service routine,
an image of the register must be saved in a RAM
location, and each time the program writes to the
DWR, it must also write to the image register. The
image register must be written first so that, if an interrupt occurs between the two instructions, the
DWR is not affected.
Figure 5Data read-only memory Window Memory Addressing
13 12
DATA ROM
WINDOW REGISTER 7 6
CONTENTS
(DWR)
11 10 9
8
7
6
5
2
1
0
4
3
0
1
5
4
3
2
1
0 PROGRAM SPACE ADDRESS
READ
5
4
3
2
1
0
DATA SPACE ADDRESS
:
40h-7Fh
IN INSTRUCTION
Example:
DWR=28h
ROM
ADDRESS:A19h
1
1
0
0
1
1
0
0
0
0
0
1
0
1
1
0
0
1
0
0
0
1
1
0
0
1
DATA SPACE ADDRESS
:
59h
VR01573C
9/79
ST62T55CM-Auto ST62T65CM-Auto
MEMORY MAP (Cont’d)
1.3.6 Data RAM/EEPROM
(DRBR)
Address: E8h — Write only
Bank
7
-
Register
0
-
-
DRBR
4
-
-
DRBR DRBR
1
0
Bit 7-5 = These bits are not used
Bit 4 - DRBR4. This bit, when set, selects RAM
Page 2.
Bit 3-2 - Reserved. These bits are not used.
Bit 1 - DRBR1. This bit, when set, selects
EEPROM Page 1, when available.
Bit 0 - DRBR0. This bit, when set, selects
EEPROM Page 0, when available.
The selection of the bank is made by programming
the Data RAM Bank Switch register (DRBR register) located at address E8h of the Data Space according to Table 1. No more than one bank should
be set at a time.
The DRBR register can be addressed like a RAM
Data Space at the address E8h; nevertheless it is
a write only register that cannot be accessed with
single-bit operations. This register is used to select
the desired 64-byte RAM/EEPROM bank of the
Data Space. The bank number has to be loaded in
the DRBR register and the instruction has to point
to the selected location as if it was in bank 0 (from
00h address to 3Fh address).
This register is not cleared during the MCU initialization, therefore it must be written before the first
access to the Data Space bank region. Refer to
10/79
the Data Space description for additional information. The DRBR register is not modified when an
interrupt or a subroutine occurs.
Notes :
Care is required when handling the DRBR register
as it is write only. For this reason, it is not allowed
to change the DRBR contents while executing interrupt service routine, as the service routine cannot save and then restore its previous content. If it
is impossible to avoid the writing of this register in
interrupt service routine, an image of this register
must be saved in a RAM location, and each time
the program writes to DRBR it must write also to
the image register. The image register must be
written first, so if an interrupt occurs between the
two instructions the DRBR is not affected.
In DRBR Register, only 1 bit must be set. Otherwise two or more pages are enabled in parallel,
producing errors.
Care must also be taken not to change the
E²PROM page (when available) when the parallel
writing mode is set for the E²PROM, as defined in
EECTL register.
Table 3Data RAM Bank Register Set-up
DRBR
00
01
02
08
10h
other
ST62T55C
None
Not Available
Not Available
Not Available
RAM Page 2
Reserved
ST62T65C/E65C
None
EEPROM Page 0
EEPROM Page 1
Not Available
RAM Page 2
Reserved
ST62T55CM-Auto ST62T65CM-Auto
MEMORY MAP (Cont’d)
1.3.7 EEPROM Description
EEPROM memory is located in 64-byte pages in
data space. This memory may be used by the user
program for non-volatile data storage.
Data space from 00h to 3Fh is paged as described
in Table 4. EEPROM locations are accessed directly by addressing these paged sections of data
space.
The EEPROM does not require dedicated instructions for read or write access. Once selected via the
Data RAM Bank Register, the active EEPROM
page is controlled by the EEPROM Control Register (EECTL), which is described below.
Bit E20FF of the EECTL register must be reset prior
to any write or read access to the EEPROM. If no
bank has been selected, or if E2OFF is set, any access is meaningless.
Programming must be enabled by setting the
E2ENA bit of the EECTL register.
The E2BUSY bit of the EECTL register is set when
the EEPROM is performing a programming cycle.
Any access to the EEPROM when E2BUSY is set
is meaningless.
Provided E2OFF and E2BUSY are reset, an EEPROM location is read just like any other data location, also in terms of access time.
Writing to the EEPROM may be carried out in two
modes: Byte Mode (BMODE) and Parallel Mode
(PMODE). In BMODE, one byte is accessed at a
time, while in PMODE up to 8 bytes in the same
row are programmed simultaneously (with consequent speed and power consumption advantages,
the latter being particularly important in battery
powered circuits).
General Notes:
Data should be written directly to the intended address in EEPROM space. There is no buffer memory between data RAM and the EEPROM space.
When the EEPROM is busy (E2BUSY = “1”)
EECTL cannot be accessed in write mode, it is
only possible to read the status of E2BUSY. This
implies that as long as the EEPROM is busy, it is
not possible to change the status of the EEPROM
Control Register. EECTL bits 4 and 5 are reserved
and must never be set.
Care is required when dealing with the EECTL register, as some bits are write only. For this reason,
the EECTL contents must not be altered while executing an interrupt service routine.
If it is impossible to avoid writing to this register
within an interrupt service routine, an image of the
register must be saved in a RAM location, and
each time the program writes to EECTL it must
also write to the image register. The image register
must be written to first so that, if an interrupt occurs between the two instructions, the EECTL will
not be affected.
Table 4Row Arrangement for Parallel Writing of EEPROM Locations
Dataspace
addresses.
Banks 0 and 1.
Byte
ROW7
ROW6
ROW5
ROW4
ROW3
ROW2
ROW1
ROW0
0
1
2
3
4
5
6
7
38h-3Fh
30h-37h
28h-2Fh
20h-27h
18h-1Fh
10h-17h
08h-0Fh
00h-07h
Up to 8 bytes in each row may be programmed simultaneously in Parallel Write mode.
The number of available 64-byte banks (1 or 2) is device dependent.
Note: The EEPROM is disabled as soon as STOP instruction is executed in order to achieve the lowest
power-consumption.
11/79
ST62T55CM-Auto ST62T65CM-Auto
MEMORY MAP (Cont’d)
Additional Notes on Parallel Mode:
If the user wishes to perform parallel programming, the first step should be to set the E2PAR2
bit. From this time on, the EEPROM will be addressed in write mode, the ROW address and the
data will be latched and it will be possible to
change them only at the end of the programming
cycle or by resetting E2PAR2 without programming the EEPROM. After the ROW address is
latched, the MCU can only “see” the selected
EEPROM row and any attempt to write or read
other rows will produce errors.
The EEPROM should not be read while E2PAR2
is set.
As soon as the E2PAR2 bit is set, the 8 volatile
ROW latches are cleared. From this moment on,
the user can load data in all or in part of the ROW.
Setting E2PAR1 will modify the EEPROM registers corresponding to the ROW latches accessed
after E2PAR2. For example, if the software sets
E2PAR2 and accesses the EEPROM by writing to
addresses 18h, 1Ah and 1Bh, and then sets
E2PAR1, these three registers will be modified simultaneously; the remaining bytes in the row will
be unaffected.
Note that E2PAR2 is internally reset at the end of
the programming cycle. This implies that the user
must set the E2PAR2 bit between two parallel programming cycles. Note that if the user tries to set
E2PAR1 while E2PAR2 is not set, there will be no
programming cycle and the E2PAR1 bit will be unaffected. Consequently, the E2PAR1 bit cannot be
set if E2ENA is low. The E2PAR1 bit can be set by
the user, only if the E2ENA and E2PAR2 bits are
also set.
Notes: The EEPROM page shall not be changed
through the DRBR register when the E2PAR2 bit
is set.
12/79
EEPROM Control Register (EECTL)
Address: EAh — Read/Write
Reset status: 00h
7
D7
0
E2O
FF
D5
D4
E2PA
R1
E2PA
R2
E2BU E2E
SY
NA
Bit 7 = D7: Unused.
Bit 6 = E2OFF: Stand-by Enable Bit. WRITE ONLY.
If this bit is set the EEPROM is disabled (any access
will be meaningless) and the power consumption of
the EEPROM is reduced to its lowest value.
Bit 5-4 = D5-D4: Reserved. MUST be kept reset.
Bit 3 = E2PAR1: Parallel Start Bit. WRITE ONLY.
Once in Parallel Mode, as soon as the user software
sets the E2PAR1 bit, parallel writing of the 8 adjacent registers will start. This bit is internally reset at
the end of the programming procedure. Note that
less than 8 bytes can be written if required, the undefined bytes being unaffected by the parallel programming cycle; this is explained in greater detail in
the Additional Notes on Parallel Mode overleaf.
Bit 2 = E2PAR2: Parallel Mode En. Bit. WRITE
ONLY. This bit must be set by the user program in
order to perform parallel programming. If E2PAR2
is set and the parallel start bit (E2PAR1) is reset,
up to 8 adjacent bytes can be written simultaneously. These 8 adjacent bytes are considered as a
row, whose address lines A7, A6, A5, A4, A3 are
fixed while A2, A1 and A0 are the changing bits, as
illustrated in Figure 4. E2PAR2 is automatically reset at the end of any parallel programming procedure. It can be reset by the user software before
starting the programming procedure, thus leaving
the EEPROM registers unchanged.
Bit 1 = E2BUSY: EEPROM Busy Bit. READ ONLY. This bit is automatically set by the EEPROM
control logic when the EEPROM is in programming mode. The user program should test it before
any EEPROM read or write operation; any attempt
to access the EEPROM while the busy bit is set
will be aborted and the writing procedure in
progress will be completed.
Bit 0 = E2ENA: EEPROM Enable Bit. WRITE ONLY. This bit enables programming of the EEPROM
cells. It must be set before any write to the EEPROM register. Any attempt to write to the EEPROM when E2ENA is low is meaningless and will
not trigger a write cycle.
ST62T55CM-Auto ST62T65CM-Auto
1.4 PROGRAMMING MODES
1.4.1 Option Bytes
The two Option Bytes allow configuration capability to the MCUs. Option byte’s content is automatically read, and the selected options enabled, when
the chip reset is activated.
It can only be accessed during the programming
mode. This access is made either automatically
(copy from a master device) or by selecting the
OPTION BYTE PROGRAMMING mode of the programmer.
The option bytes are located in a non-user map.
No address has to be specified.
EPROM Code Option Byte (LSB)
7
PROTECT
0
EXTCNTL
PB2-3 PB0-1
WDACT
PULL PULL
DELAY
OSCIL OSGEN
EPROM Code Option Byte (MSB)
15
-
8
-
-
ADC
SYNCHRO
-
-
NMI
PULL
LVD
D15-D13. Reserved. Must be cleared.
ADC SYNCHRO. When set, an A/D conversion is
started upon WAIT instruction execution, in order
to reduce supply noise. When this bit is low, an A/
D conversion is started as soon as the STA bit of
the A/D Converter Control Register is set.
D11-D10. Reserved, must be cleared.
NMI PULL. NMI Pull-Up. This bit must be set high
to configure the NMI pin with a pull-up resistor.
When it is low, no pull-up is provided.
LVD. LVD RESET enable.When this bit is set, safe
RESET is performed by MCU when the supply
voltage is too low. When this bit is cleared, only
power-on reset or external RESET are active.
PROTECT. Readout Protection. This bit allows the
protection of the software contents against piracy.
When the bit PROTECT is set high, readout of the
OTP contents is prevented by hardware.. When
this bit is low, the user program can be read.
EXTCNTL. External STOP MODE control.. When
EXTCNTL is high, STOP mode is available with
watchdog active by setting NMI pin to one. When
EXTCNTL is low, STOP mode is not available with
the watchdog active.
PB2-3 PULL. When set this bit removes pull-up at
reset on PB2-PB3 pins. When cleared PB2-PB3
pins have an internal pull-up resistor at reset.
PB0-1 PULL. When set this bit removes pull-up at
reset on PB0-PB1 pins. When cleared PB0-PB1
pins have an internal pull-up resistor at reset.
WDACT. This bit controls the watchdog activation.
When it is high, hardware activation is selected.
The software activation is selected when WDACT
is low.
DELAY. This bit enables the selection of the delay
internally generated after the internal reset (external pin, LVD, or watchdog activated) is released.
When DELAY is low, the delay is 2048 cycles of
the oscillator, it is of 32768 cycles when DELAY is
high.
OSCIL. Oscillator selection. When this bit is low,
the oscillator must be controlled by a quartz crystal, a ceramic resonator or an external frequency.
When it is high, the oscillator must be controlled by
an RC network, with only the resistor having to be
externally provided.
OSGEN. Oscillator Safe Guard. This bit must be
set high to enable the Oscillator Safe Guard.
When this bit is low, the OSG is disabled.
The Option byte is written during programming either by using the PC menu (PC driven Mode) or
automatically (stand-alone mode).
13/79
ST62T55CM-Auto ST62T65CM-Auto
PROGRAMMING MODES (Cont’d)
1.4.2 EPROM Erasing
The EPROM of the windowed package of the
MCUs may be erased by exposure to Ultra Violet
light. The erasure characteristic of the MCUs is
such that erasure begins when the memory is exposed to light with a wave lengths shorter than approximately 4000Å. It should be noted that sunlights and some types of fluorescent lamps have
wavelengths in the range 3000-4000Å.
It is thus recommended that the window of the
MCUs packages be covered by an opaque label to
14/79
prevent unintentional erasure problems when testing the application in such an environment.
The recommended erasure procedure of the
MCUs EPROM is the exposure to short wave ultraviolet light which have a wave-length 2537A.
The integrated dose (i.e. U.V. intensity x exposure
time) for erasure should be a minimum of 15Wsec/cm2. The erasure time with this dosage is approximately 15 to 20 minutes using an ultraviolet
lamp with 12000µW/cm2 power rating. The
ST62E65C should be placed within 2.5cm (1Inch)
of the lamp tubes during erasure.
ST62T55CM-Auto ST62T65CM-Auto
2 CENTRAL PROCESSING UNIT
2.1 INTRODUCTION
The CPU Core of ST6 devices is independent of the
I/O or Memory configuration. As such, it may be
thought of as an independent central processor
communicating with on-chip I/O, Memory and Peripherals via internal address, data, and control
buses. In-core communication is arranged as
shown in Figure 6; the controller being externally
linked to both the Reset and Oscillator circuits,
while the core is linked to the dedicated on-chip peripherals via the serial data bus and indirectly, for
interrupt purposes, through the control registers.
Indirect Registers (X, Y). These two indirect registers are used as pointers to memory locations in
Data space. They are used in the register-indirect
addressing mode. These registers can be addressed in the data space as RAM locations at addresses 80h (X) and 81h (Y). They can also be accessed with the direct, short direct, or bit direct addressing modes. Accordingly, the ST6 instruction
set can use the indirect registers as any other register of the data space.
Short Direct Registers (V, W). These two registers are used to save a byte in short direct addressing mode. They can be addressed in Data
space as RAM locations at addresses 82h (V) and
83h (W). They can also be accessed using the direct and bit direct addressing modes. Thus, the
ST6 instruction set can use the short direct registers as any other register of the data space.
Program Counter (PC). The program counter is a
12-bit register which contains the address of the
next ROM location to be processed by the core.
This ROM location may be an opcode, an operand, or the address of an operand. The 12-bit
length allows the direct addressing of 4096 bytes
in Program space.
2.2 CPU REGISTERS
The ST6 Family CPU core features six registers and
three pairs of flags available to the programmer.
These are described in the following paragraphs.
Accumulator (A). The accumulator is an 8-bit
general purpose register used in all arithmetic calculations, logical operations, and data manipulations. The accumulator can be addressed in Data
space as a RAM location at address FFh. Thus the
ST6 can manipulate the accumulator just like any
other register in Data space.
Figure 6. ST6 Core Block Diagram
0,01 TO 8MHz
RESET
OSCin
OSCout
INTERRUPTS
CONTROLLER
DATA SPACE
OPCODE
FLAG
VALUES
CONTROL
SIGNALS
DATA
ADDRESS/READ LINE
2
RAM/EEPROM
PROGRAM
ADDRESS
256
DECODER
ROM/EPROM
A-DATA
B-DATA
DATA
ROM/EPROM
DEDICATIONS
ACCUMULATOR
12
Program Counter
and
6 LAYER STACK
FLAGS
ALU
RESULTS TO DATA SPACE (WRITE LINE)
VR01811
15/79
ST62T55CM-Auto ST62T65CM-Auto
CPU REGISTERS (Cont’d)
However, if the program space contains more than
4096 bytes, the additional memory in program
space can be addressed by using the Program
Bank Switch register.
The PC value is incremented after reading the address of the current instruction. To execute relative
jumps, the PC and the offset are shifted through
the ALU, where they are added; the result is then
shifted back into the PC. The program counter can
be changed in the following ways:
- JP (Jump) instructionPC=Jump address
- CALL instructionPC= Call address
- Relative Branch Instruction.PC= PC +/- offset
- Interrupt
PC=Interrupt vector
- Reset
PC= Reset vector
- RET & RETI instructionsPC= Pop (stack)
- Normal instructionPC= PC + 1
Flags (C, Z). The ST6 CPU includes three pairs of
flags (Carry and Zero), each pair being associated
with one of the three normal modes of operation:
Normal mode, Interrupt mode and Non Maskable
Interrupt mode. Each pair consists of a CARRY
flag and a ZERO flag. One pair (CN, ZN) is used
during Normal operation, another pair is used during Interrupt mode (CI, ZI), and a third pair is used
in the Non Maskable Interrupt mode (CNMI, ZNMI).
The ST6 CPU uses the pair of flags associated
with the current mode: as soon as an interrupt (or
a Non Maskable Interrupt) is generated, the ST6
CPU uses the Interrupt flags (resp. the NMI flags)
instead of the Normal flags. When the RETI instruction is executed, the previously used set of
flags is restored. It should be noted that each flag
set can only be addressed in its own context (Non
Maskable Interrupt, Normal Interrupt or Main routine). The flags are not cleared during context
switching and thus retain their status.
The Carry flag is set when a carry or a borrow occurs during arithmetic operations; otherwise it is
cleared. The Carry flag is also set to the value of
the bit tested in a bit test instruction; it also participates in the rotate left instruction.
The Zero flag is set if the result of the last arithmetic or logical operation was equal to zero; otherwise it is cleared.
Switching between the three sets of flags is performed automatically when an NMI, an interrupt or
a RETI instructions occurs. As the NMI mode is
16/79
automatically selected after the reset of the MCU,
the ST6 core uses at first the NMI flags.
Stack. The ST6 CPU includes a true LIFO hardware stack which eliminates the need for a stack
pointer. The stack consists of six separate 12-bit
RAM locations that do not belong to the data
space RAM area. When a subroutine call (or interrupt request) occurs, the contents of each level are
shifted into the next higher level, while the content
of the PC is shifted into the first level (the original
contents of the sixth stack level are lost). When a
subroutine or interrupt return occurs (RET or RETI
instructions), the first level register is shifted back
into the PC and the value of each level is popped
back into the previous level. Since the accumulator, in common with all other data space registers,
is not stored in this stack, management of these
registers should be performed within the subroutine. The stack will remain in its “deepest” position
if more than 6 nested calls or interrupts are executed, and consequently the last return address will
be lost. It will also remain in its highest position if
the stack is empty and a RET or RETI is executed.
In this case the next instruction will be executed.
lFigure 7. ST6 CPU Programming Mode
INDEX
REGISTER
b11
b7
X REG. POINTER
b0
b7
Y REG. POINTER
b0
b7
V REGISTER
b7
W REGISTER
b0
b7
ACCUMULATOR
b0
PROGRAM COUNTER
SHORT
DIRECT
ADDRESSING
MODE
b0
b0
SIX LEVELS
STACK REGISTER
NORMAL FLAGS
C
Z
INTERRUPT FLAGS
C
Z
NMI FLAGS
C
Z
VA000423
ST62T55CM-Auto ST62T65CM-Auto
3 CLOCKS, RESET, INTERRUPTS AND POWER SAVING MODES
3.1 CLOCK SYSTEM
The MCU features a Main Oscillator which can be
driven by an external clock, or used in conjunction
with an AT-cut parallel resonant crystal or a suitable ceramic resonator, or with an external resistor
(RNET). In addition, a Low Frequency Auxiliary Oscillator (LFAO) can be switched in for security reasons, to reduce power consumption, or to offer the
benefits of a back-up clock system.
The Oscillator Safeguard (OSG) option filters
spikes from the oscillator lines, provides access to
the LFAO to provide a backup oscillator in the
event of main oscillator failure and also automatically limits the internal clock frequency (fINT) as a
function of VDD, in order to guarantee correct operation. These functions are illustrated in Figure 9,
Figure 10, Figure 11 and Figure 12.
A programmable divider on FINT is also provided in
order to adjust the internal clock of the MCU to the
best power consumption and performance tradeoff.
Figure 8 illustrates various possible oscillator configurations using an external crystal or ceramic resonator, an external clock input, an external resistor
(RNET), or the lowest cost solution using only the
LFAO. CL1 an CL2 should have a capacitance in the
range 12 to 22 pF for an oscillator frequency in the
4-8 MHz range.
The internal MCU clock frequency (fINT) is divided
by 12 to drive the Timer, the A/D converter and the
Watchdog timer, and by 13 to drive the CPU core,
as may be seen in Figure 11.
With an 8 MHz oscillator frequency, the fastest machine cycle is therefore 1.625µs.
A machine cycle is the smallest unit of time needed
to execute any operation (for instance, to increment
the Program Counter). An instruction may require
two, four, or five machine cycles for execution.
3.1.1 Main Oscillator
The oscillator configuration may be specified by selecting the appropriate option. When the CRYSTAL/
RESONATOR option is selected, it must be used with
a quartz crystal, a ceramic resonator or an external
signal provided on the OSCin pin. When the RC NETWORK option is selected, the system clock is generated by an external resistor.
The main oscillator can be turned off (when the
OSG ENABLED option is selected) by setting the
OSCOFF bit of the ADC Control Register. The
Low Frequency Auxiliary Oscillator is automatically started.
Figure 8. Oscillator Configurations
CRYSTAL/RESONATOR CLOCK
CRYSTAL/RESONATOR option
ST6xxx
OSCin
OSCout
CL1n
CL2
EXTERNAL CLOCK
CRYSTAL/RESONATOR option
ST6xxx
OSCin
OSCout
NC
RC NETWORK
RC NETWORK option
ST6xxx
OSCin
OSCout
NC
RNET
INTEGRATED CLOCK
CRYSTAL/RESONATOR option
OSG ENABLED option
ST6xxx
OSCin
OSCout
NC
17/79
ST62T55CM-Auto ST62T65CM-Auto
CLOCK SYSTEM (Cont’d)
Turning on the main oscillator is achieved by resetting the OSCOFF bit of the A/D Converter Control Register or by resetting the MCU. Restarting
the main oscillator implies a delay comprising the
oscillator start up delay period plus the duration of
the software instruction at fLFAO clock frequency.
3.1.2 Low Frequency Auxiliary Oscillator
(LFAO)
The Low Frequency Auxiliary Oscillator has three
main purposes. Firstly, it can be used to reduce
power consumption in non timing critical routines.
Secondly, it offers a fully integrated system clock,
without any external components. Lastly, it acts as
a safety oscillator in case of main oscillator failure.
This oscillator is available when the OSG ENABLED option is selected. In this case, it automatically starts one of its periods after the first missing
edge from the main oscillator, whatever the reason
(main oscillator defective, no clock circuitry provided, main oscillator switched off...).
User code, normal interrupts, WAIT and STOP instructions, are processed as normal, at the reduced fLFAO frequency. The A/D converter accuracy is decreased, since the internal frequency is below 1MHz.
At power on, the Low Frequency Auxiliary Oscillator starts faster than the Main Oscillator. It therefore feeds the on-chip counter generating the POR
delay until the Main Oscillator runs.
The Low Frequency Auxiliary Oscillator is automatically switched off as soon as the main oscillator starts.
ADCR
Address: 0D1h — Read/Write
7
ADCR ADCR ADCR ADCR ADCR
7
6
5
4
3
0
OSC
OFF
ADCR ADCR
1
0
Bit 7-3, 1-0= ADCR7-ADCR3, ADCR1-ADCR0:
ADC Control Register. These bits are reserved for
ADC Control.
Bit 2 = OSCOFF. When low, this bit enables main
oscillator to run. The main oscillator is switched off
when OSCOFF is high.
3.1.3 Oscillator Safe Guard
The Oscillator Safe Guard (OSG) affords drastically increased operational integrity in ST62xx devices. The OSG circuit provides three basic func-
18/79
tions: it filters spikes from the oscillator lines which
would result in over frequency to the ST62 CPU; it
gives access to the Low Frequency Auxiliary Oscillator (LFAO), used to ensure minimum processing in case of main oscillator failure, to offer reduced power consumption or to provide a fixed frequency low cost oscillator; finally, it automatically
limits the internal clock frequency as a function of
supply voltage, in order to ensure correct operation even if the power supply should drop.
The OSG is enabled or disabled by choosing the
relevant OSG option. It may be viewed as a filter
whose cross-over frequency is device dependent.
Spikes on the oscillator lines result in an effectively
increased internal clock frequency. In the absence
of an OSG circuit, this may lead to an over frequency for a given power supply voltage. The
OSG filters out such spikes (as illustrated in Figure
9). In all cases, when the OSG is active, the maximum internal clock frequency, fINT, is limited to
fOSG, which is supply voltage dependent. This relationship is illustrated in Figure 12.
When the OSG is enabled, the Low Frequency
Auxiliary Oscillator may be accessed. This oscillator starts operating after the first missing edge of
the main oscillator (see Figure 10).
Over-frequency, at a given power supply level, is
seen by the OSG as spikes; it therefore filters out
some cycles in order that the internal clock frequency of the device is kept within the range the
particular device can stand (depending on VDD),
and below fOSG: the maximum authorised frequency with OSG enabled.
Note. The OSG should be used wherever possible
as it provides maximum safety. Care must be taken, however, as it can increase power consumption and reduce the maximum operating frequency
to fOSG.
Warning: Care has to be taken when using the
OSG, as the internal frequency is defined between
a minimum and a maximum value and is not accurate.
For precise timing measurements, it is not recommended to use the OSG and it should not be enabled in applications that use the SPI or the UART.
It should also be noted that power consumption in
Stop mode is higher when the OSG is enabled
(around 50µA at nominal conditions and room
temperature).
ST62T55CM-Auto ST62T65CM-Auto
CLOCK SYSTEM (Cont’d)
Figure 9. OSG Filtering Principle
(1)
(2)
(3)
(4)
(1) Maximum Frequency for the device to work correctly
(2) Actual Quartz Crystal Frequency at OSCin pin
(3) Noise from OSCin
(4) Resulting Internal Frequency
VR001932
Figure 10. OSG Emergency Oscillator Principle
Main
Oscillator
Emergency
Oscillator
Internal
Frequency
VR001933
19/79
ST62T55CM-Auto ST62T65CM-Auto
CLOCK SYSTEM (Cont’d)
Oscillator Control Registers
Address: DCh — Write only
Reset State: 00h
7
-
0
-
-
-
OSCR
3
-
RS1
RS0
Bit 7-4. These bits are not used.
Bit 3. Reserved. Cleared at Reset. Must be kept
cleared.
Bit 2. Reserved. Must be kept low.
RS1-RS0. These bits select the division ratio of
the Oscillator Divider in order to generate the internal frequency. The following selctions are available:
20/79
RS1
0
0
1
1
RS0
0
1
0
1
Division Ratio
1
2
4
4
Note: Care is required when handling the OSCR
register as some bits are write only. For this reason, it is not allowed to change the OSCR contents
while executing interrupt service routine, as the
service routine cannot save and then restore its
previous content. If it is impossible to avoid the
writing of this register in interrupt service routine,
an image of this register must be saved in a RAM
location, and each time the program writes to
OSCR it must write also to the image register. The
image register must be written first, so if an interrupt occurs between the two instructions the
OSCR is not affected.
ST62T55CM-Auto ST62T65CM-Auto
CLOCK SYSTEM (Cont’d)
Figure 11. Clock Circuit Block Diagram
POR
: 13
Core
OSG
TIMER 1
M
U
X
MAIN
OSCILLATOR
fINT
OSCILLATOR
DIVIDER
: 12
Watchdog
RS0,RS1
LFAO
:1
Main Oscillator off
Figure 12. Maximum Operating Frequency (fMAX) versus Supply Voltage (VDD)
Maximum FREQUENCY (MHz)
8
4
FUNCTIONALITY IS NOT
GUARANTEED
IN THIS AREA
7
6
5
4
3
3
fOSG
fOSG Min (at 85°C)
2
fOSG Min (at 125°C)
2
1
1
2.5
3
3.6
4
4.5
5
5.5
6
SUPPLY VOLTAGE (VDD)
VR01807J
Notes:
1. In this area, operation is guaranteed at the
quartz crystal frequency.
2. When the OSG is disabled, operation in this
area is guaranteed at the crystal frequency. When
the OSG is enabled, operation in this area is guaranteed at a frequency of at least fOSG Min.
3. When the OSG is disabled, operation in this
area is guaranteed at the quartz crystal frequency.
When the OSG is enabled, access to this area is
prevented. The internal frequency is kept a fOSG.
4. When the OSG is disabled, operation in this
area is not guaranteed
When the OSG is enabled, access to this area is
prevented. The internal frequency is kept at fOSG.
21/79
ST62T55CM-Auto ST62T65CM-Auto
3.2 RESETS
The MCU can be reset in four ways:
– by the external Reset input being pulled low;
– by Power-on Reset;
– by the digital Watchdog peripheral timing out.
– by Low Voltage Detection (LVD)
3.2.1 RESET Input
The RESET pin may be connected to a device of
the application board in order to reset the MCU if
required. The RESET pin may be pulled low in
RUN, WAIT or STOP mode. This input can be
used to reset the MCU internal state and ensure a
correct start-up procedure. The pin is active low
and features a Schmitt trigger input. The internal
Reset signal is generated by adding a delay to the
external signal. Therefore even short pulses on
the RESET pin are acceptable, provided VDD has
completed its rising phase and that the oscillator is
running correctly (normal RUN or WAIT modes).
The MCU is kept in the Reset state as long as the
RESET pin is held low.
If RESET activation occurs in the RUN or WAIT
modes, processing of the user program is stopped
(RUN mode only), the Inputs and Outputs are configured as inputs with pull-up resistors and the
main Oscillator is restarted. When the level on the
RESET pin then goes high, the initialization sequence is executed following expiry of the internal
delay period.
If RESET pin activation occurs in the STOP mode,
the oscillator starts up and all Inputs and Outputs
are configured as inputs with pull-up resistors.
When the level of the RESET pin then goes high,
the initialization sequence is executed following
expiry of the internal delay period.
3.2.2 Power-on Reset
The function of the POR circuit consists in waking
up the MCU by detecting around 2V a dynamic
(rising edge) variation of the VDD Supply. At the
beginning of this sequence, the MCU is configured
in the Reset state: all I/O ports are configured as
inputs with pull-up resistors and no instruction is
executed. When the power supply voltage rises to
a sufficient level, the oscillator starts to operate,
whereupon an internal delay is initiated, in order to
allow the oscillator to fully stabilize before executing the first instruction. The initialization sequence
22/79
is executed immediately following the internal delay.
To ensure correct start-up, the user should take
care that the VDD Supply is stabilized at a sufficient level for the chosen frequency (see recommended operation) before the reset signal is released. In addition, supply rising must start from
0V.
As a consequence, the POR does not allow to supervise static, slowly rising, or falling, or noisy
(presenting oscillation) VDD supplies.
An external RC network connected to the RESET
pin, or the LVD reset can be used instead to get
the best performances.
Figure 13. Reset and Interrupt Processing
RESET
NMI MASK SET
INT LATCH CLEARED
( IF PRESENT )
SELECT
NMI MODE FLAGS
PUT FFEH
ON ADDRESS BUS
YES
IS RESET STILL
PRESENT?
NO
LOAD PC
FROM RESET LOCATIONS
FFE/FFF
FETCH INSTRUCTION
VA000427
ST62T55CM-Auto ST62T65CM-Auto
RESETS (Cont’d)
3.2.3 Watchdog Reset
The MCU provides a Watchdog timer function in
order to ensure graceful recovery from software
upsets. If the Watchdog register is not refreshed
before an end-of-count condition is reached, the
internal reset will be activated. This, amongst other things, resets the watchdog counter.
The MCU restarts just as though the Reset had
been generated by the RESET pin, including the
built-in stabilisation delay period.
3.2.4 LVD Reset
The on-chip Low Voltage Detector, selectable as
user option, features static Reset when supply
voltage is below a reference value. Thanks to this
feature, external reset circuit can be removed
while keeping the application safety. This SAFE
RESET is effective as well in Power-on phase as
in power supply drop with different reference val-
ues, allowing hysteresis effect. Reference value in
case of voltage drop has been set lower than the
reference value for power-on in order to avoid any
parasitic Reset when MCU start's running and
sinking current on the supply.
As long as the supply voltage is below the reference value, there is a internal and static RESET
command. The MCU can start only when the supply voltage rises over the reference value. Therefore, only two operating mode exist for the MCU:
RESET active below the voltage reference, and
running mode over the voltage reference as
shown on the Figure 14, that represents a powerup, power-down sequence.
Note: When the RESET state is controlled by one
of the internal RESET sources (Low Voltage Detector, Watchdog, Power on Reset), the RESET
pin is tied to low logic level.
Figure 14. LVD Reset on Power-on and Power-down (Brown-out)
VDD
VUp
Vdn
RESET
RESET
time
VR02106A
3.2.5 Application Notes
No external resistor is required between VDD and
the Reset pin, thanks to the built-in pull-up device.
Direct external connection of the pin RESET to
VDD must be avoided in order to ensure safe behaviour of the internal reset sources (AND.Wired
structure).
23/79
ST62T55CM-Auto ST62T65CM-Auto
RESETS (Cont’d)
3.2.6 MCU Initialization Sequence
When a reset occurs the stack is reset, the PC is
loaded with the address of the Reset Vector (located in program ROM starting at address 0FFEh). A
jump to the beginning of the user program must be
coded at this address. Following a Reset, the Interrupt flag is automatically set, so that the CPU is
in Non Maskable Interrupt mode; this prevents the
initialisation routine from being interrupted. The initialisation routine should therefore be terminated
by a RETI instruction, in order to revert to normal
mode and enable interrupts. If no pending interrupt
is present at the end of the initialisation routine, the
MCU will continue by processing the instruction
immediately following the RETI instruction. If, however, a pending interrupt is present, it will be serviced.
Figure 15. Reset and Interrupt Processing
RESET
JP
JP:2 BYTES/4 CYCLES
RESET
VECTOR
INITIALIZATION
ROUTINE
RETI: 1 BYTE/2 CYCLES
RETI
VA00181
Figure 16. Reset Block Diagram
VDD
fOSC
COUNTER
RPU
RESD1)
RESET
ST6
INTERNAL
RESET
CK
AND. Wired
RESET
RESET
POWER ON RESET
WATCHDOG RESET
LVD RESET
VR02107A
1) Resistive ESD protection. Value not guaranteed.
24/79
ST62T55CM-Auto ST62T65CM-Auto
RESETS (Cont’d)
Table 5Register Reset Status
Register
Oscillator Control Register
Address(es)
0DCh
Status
00h
Comment
EEPROM Control Register
0EAh
00h
EEPROM disabled (if available)
Port Data Registers
0C0h to 0C2h
00h
I/O are Input with pull-up
Port Direction Register
0C4h to 0C6h
00h
I/O are Input with pull-up
Port Option Register
0CCh to 0CEh
00h
I/O are Input with pull-up
Interrupt Option Register
0C8h
00h
Interrupt disabled
TIMER Status/Control
0D4h
00h
TIMER disabled
AR TIMER Mode Control Register
0D5h
00h
AR TIMER stopped
AR TIMER Status/Control 0 Register
0D6h
02h
AR TIMER Status/Control 1 Register
0D7h
00h
AR TIMER Compare Register
0DAh
00h
AR TIMER Load Register
0DBh
00h
Miscellaneous Register
0DDh
00h
SPI Output not connected to PC3
SPI Registers
0E0h to 0E2h
00h
SPI disabled
SPI DIV Register
0E1h
00h
SPI disabled
SPI MOD Register
0E2h
00h
SPI disabled
SPI DSR Register
X, Y, V, W, Register
0E0h
080H TO 083H
Undefined
SPI disabled
Accumulator
0FFh
Data RAM
084h to 0BFh
Data RAM EEPROM Page Register
0E8h
Data ROM Window Register
0C9h
EEPROM
00h to 03Fh
A/D Result Register
0D0h
AR TIMER Load Register
0DBh
AR TIMER Reload/Capture Register
TIMER Counter Register
0D9h
0D3h
TIMER Prescaler Register
0D2h
7Fh
Watchdog Counter Register
0D8h
FEh
A/D Control Register
0D1h
40h
Undefined
As written if programmed
FFh
Max count loaded
A/D in Standby
25/79
ST62T55CM-Auto ST62T65CM-Auto
3.3 DIGITAL WATCHDOG
The digital Watchdog consists of a reloadable
downcounter timer which can be used to provide
controlled recovery from software upsets.
The Watchdog circuit generates a Reset when the
downcounter reaches zero. User software can
prevent this reset by reloading the counter, and
should therefore be written so that the counter is
regularly reloaded while the user program runs
correctly. In the event of a software mishap (usually caused by externally generated interference),
the user program will no longer behave in its usual
fashion and the timer register will thus not be reloaded periodically. Consequently the timer will
decrement down to 00h and reset the MCU. In order to maximise the effectiveness of the Watchdog
function, user software must be written with this
concept in mind.
Watchdog behaviour is governed by two options,
known as “WATCHDOG ACTIVATION” (i.e.
HARDWARE or SOFTWARE) and “EXTERNAL
STOP MODE CONTROL” (see Table 6).
In the SOFTWARE option, the Watchdog is disabled until bit C of the DWDR register has been set.
When the Watchdog is disabled, low power Stop
mode is available. Once activated, the Watchdog
cannot be disabled, except by resetting the MCU.
In the HARDWARE option, the Watchdog is permanently enabled. Since the oscillator will run continuously, low power mode is not available. The
STOP instruction is interpreted as a WAIT instruction, and the Watchdog continues to countdown.
However, when the EXTERNAL STOP MODE
CONTROL option has been selected low power
consumption may be achieved in Stop Mode.
Execution of the STOP instruction is then governed by a secondary function associated with the
NMI pin. If a STOP instruction is encountered
when the NMI pin is low, it is interpreted as WAIT,
as described above. If, however, the STOP instruction is encountered when the NMI pin is high,
the Watchdog counter is frozen and the CPU enters STOP mode.
When the MCU exits STOP mode (i.e. when an interrupt is generated), the Watchdog resumes its
activity.
Table 6. Recommended Option Choices
Functions Required
Stop Mode & Watchdog
Stop Mode
Watchdog
26/79
Recommended Options
“EXTERNAL STOP MODE” & “HARDWARE WATCHDOG”
“SOFTWARE WATCHDOG”
“HARDWARE WATCHDOG”
ST62T55CM-Auto ST62T65CM-Auto
Figure 17. Watchdog Counter Control
D0
C
D1
SR
D2
D3
D4
D5
WATCHDOG COUNTER
WATCHDOG CONTROL REGISTER
DIGITAL WATCHDOG (Cont’d)
The Watchdog is associated with a Data space
register (Digital WatchDog Register, DWDR, location 0D8h) which is described in greater detail in
Section 3.3.1 Digital Watchdog Register (DWDR).
This register is set to 0FEh on Reset: bit C is
cleared to “0”, which disables the Watchdog; the
timer downcounter bits, T0 to T5, and the SR bit
are all set to “1”, thus selecting the longest Watchdog timer period. This time period can be set to the
user’s requirements by setting the appropriate value for bits T0 to T5 in the DWDR register. The SR
bit must be set to “1”, since it is this bit which generates the Reset signal when it changes to “0”;
clearing this bit would generate an immediate Reset.
It should be noted that the order of the bits in the
DWDR register is inverted with respect to the associated bits in the down counter: bit 7 of the
DWDR register corresponds, in fact, to T0 and bit
2 to T5. The user should bear in mind the fact that
these bits are inverted and shifted with respect to
the physical counter bits when writing to this register. The relationship between the DWDR register
bits and the physical implementation of the Watchdog timer downcounter is illustrated in Figure 17.
Only the 6 most significant bits may be used to define the time period, since it is bit 6 which triggers
the Reset when it changes to “0”. This offers the
user a choice of 64 timed periods ranging from
3,072 to 196,608 clock cycles (with an oscillator
frequency of 8 MHz, this is equivalent to timer periods ranging from 384 µs to 24.576 ms).
RESET
T5
T4
T3
T2
D6
T1
D7
T0
÷28
OSC ÷12
VR02068A
27/79
ST62T55CM-Auto ST62T65CM-Auto
DIGITAL WATCHDOG (Cont’d)
3.3.1 Digital Watchdog Register (DWDR)
Address: 0D8h — Read/Write
Reset status: 1111 1110 b
7
T0
0
T1
T2
T3
T4
T5
SR
C
Bit 0 = C: Watchdog Control bit
If the hardware option is selected, this bit is forced
high and the user cannot change it (the Watchdog
is always active). When the software option is selected, the Watchdog function is activated by setting bit C to 1, and cannot then be disabled (save
by resetting the MCU).
When C is kept low the counter can be used as a
7-bit timer.
This bit is cleared to “0” on Reset.
Bit 1 = SR: Software Reset bit
This bit triggers a Reset when cleared.
When C = “0” (Watchdog disabled) it is the MSB of
the 7-bit timer.
This bit is set to “1” on Reset.
Bits 2-7 = T5-T0: Downcounter bits
It should be noted that the register bits are reversed and shifted with respect to the physical
counter: bit-7 (T0) is the LSB of the Watchdog
downcounter and bit-2 (T5) is the MSB.
These bits are set to “1” on Reset.
28/79
3.3.2 Application Notes
The Watchdog plays an important supporting role
in the high noise immunity of ST62xx devices, and
should be used wherever possible. Watchdog related options should be selected on the basis of a
trade-off between application security and STOP
mode availability.
When STOP mode is not required, hardware activation without EXTERNAL STOP MODE CONTROL should be preferred, as it provides maximum security, especially during power-on.
When STOP mode is required, hardware activation and EXTERNAL STOP MODE CONTROL
should be chosen. NMI should be high by default,
to allow STOP mode to be entered when the MCU
is idle.
The NMI pin can be connected to an I/O line (see
Figure 18) to allow its state to be controlled by software. The I/O line can then be used to keep NMI
low while Watchdog protection is required, or to
avoid noise or key bounce. When no more
processing is required, the I/O line is released and
the device placed in STOP mode for lowest power
consumption.
When software activation is selected and the
Watchdog is not activated, the downcounter may
be used as a simple 7-bit timer (remember that the
bits are in reverse order).
The software activation option should be chosen
only when the Watchdog counter is to be used as
a timer. To ensure the Watchdog has not been unexpectedly activated, the following instructions
should be executed within the first 27 instructions:
jrr 0, WD, #+3
ldi WD, 0FDH
ST62T55CM-Auto ST62T65CM-Auto
DIGITAL WATCHDOG (Cont’d)
These instructions test the C bit and Reset the
MCU (i.e. disable the Watchdog) if the bit is set
(i.e. if the Watchdog is active), thus disabling the
Watchdog.
In all modes, a minimum of 28 instructions are executed after activation, before the Watchdog can
generate a Reset. Consequently, user software
should load the watchdog counter within the first
27 instructions following Watchdog activation
(software mode), or within the first 27 instructions
executed following a Reset (hardware activation).
It should be noted that when the GEN bit is low (interrupts disabled), the NMI interrupt is active but
cannot cause a wake up from STOP/WAIT modes.
Figure 18. A typical circuit making use of the
EXERNAL STOP MODE CONTROL feature
SWITCH
NMI
I/O
VR02002
Figure 19. Digital Watchdog Block Diagram
RESET
Q
RSFF
R
S
7
-2
DB1.7 LOAD SET
DB0
-2 8
SET
-12
OSCILLATOR
CLOCK
8
WRITE
RESET
DATA BUS
VA00010
29/79
ST62T55CM-Auto ST62T65CM-Auto
3.4 INTERRUPTS
The CPU can manage four Maskable Interrupt
sources, in addition to a Non Maskable Interrupt
source (top priority interrupt). Each source is associated with a specific Interrupt Vector which contains a Jump instruction to the associated interrupt
service routine. These vectors are located in Program space (see Table 7).
When an interrupt source generates an interrupt
request, and interrupt processing is enabled, the
PC register is loaded with the address of the interrupt vector (i.e. of the Jump instruction), which
then causes a Jump to the relevant interrupt service routine, thus servicing the interrupt.
Interrupt sources are linked to events either on external pins, or on chip peripherals. Several events
can be ORed on the same interrupt source, and
relevant flags are available to determine which
event triggered the interrupt.
The Non Maskable Interrupt request has the highest priority and can interrupt any interrupt routine
at any time; the other four interrupts cannot interrupt each other. If more than one interrupt request
is pending, these are processed by the processor
core according to their priority level: source #1 has
the higher priority while source #4 the lower. The
priority of each interrupt source is fixed.
Table 7. Interrupt Vector Map
Interrupt Source
Interrupt source #0
Interrupt source #1
Interrupt source #2
Interrupt source #3
Interrupt source #4
Priority
1
2
3
4
5
Vector Address
(FFCh-FFDh)
(FF6h-FF7h)
(FF4h-FF5h)
(FF2h-FF3h)
(FF0h-FF1h)
ically reset by the core at the beginning of the nonmaskable interrupt service routine.
Interrupt request from source #1 can be configured either as edge or level sensitive by setting accordingly the LES bit of the Interrupt Option Register (IOR).
Interrupt request from source #2 are always edge
sensitive. The edge polarity can be configured by
setting accordingly the ESB bit of the Interrupt Option Register (IOR).
Interrupt request from sources #3 & #4 are level
sensitive.
In edge sensitive mode, a latch is set when a edge
occurs on the interrupt source line and is cleared
when the associated interrupt routine is started.
So, the occurrence of an interrupt can be stored,
until completion of the running interrupt routine before being processed. If several interrupt requests
occurs before completion of the running interrupt
routine, only the first request is stored.
Storage of interrupt requests is not available in level sensitive mode. To be taken into account, the
low level must be present on the interrupt pin when
the MCU samples the line after instruction execution.
At the end of every instruction, the MCU tests the
interrupt lines: if there is an interrupt request the
next instruction is not executed and the appropriate interrupt service routine is executed instead.
Table 8. Interrupt Option Register Description
GEN
SET
CLEARED
SET
3.4.1 Interrupt request
All interrupt sources but the Non Maskable Interrupt source can be disabled by setting accordingly
the GEN bit of the Interrupt Option Register (IOR).
This GEN bit also defines if an interrupt source, including the Non Maskable Interrupt source, can restart the MCU from STOP/WAIT modes.
Interrupt request from the Non Maskable Interrupt
source #0 is latched by a flip flop which is automat-
30/79
ESB
CLEARED
SET
LES
CLEARED
OTHERS
NOT USED
Enable all interrupts
Disable all interrupts
Rising edge mode on interrupt source #2
Falling edge mode on interrupt source #2
Level-sensitive mode on interrupt source #1
Falling edge mode on interrupt source #1
ST62T55CM-Auto ST62T65CM-Auto
INTERRUPTS (Cont’d)
3.4.2 Interrupt Procedure
The interrupt procedure is very similar to a call procedure, indeed the user can consider the interrupt
as an asynchronous call procedure. As this is an
asynchronous event, the user cannot know the
context and the time at which it occurred. As a result, the user should save all Data space registers
which may be used within the interrupt routines.
There are separate sets of processor flags for normal, interrupt and non-maskable interrupt modes,
which are automatically switched and so do not
need to be saved.
The following list summarizes the interrupt procedure:
MCU
– The interrupt is detected.
– The C and Z flags are replaced by the interrupt
flags (or by the NMI flags).
– The PC contents are stored in the first level of
the stack.
– The normal interrupt lines are inhibited (NMI still
active).
– The first internal latch is cleared.
– The associated interrupt vector is loaded in the PC.
WARNING: In some circumstances, when a
maskable interrupt occurs while the ST6 core is in
NORMAL mode and especially during the execution of an "ldi IOR, 00h" instruction (disabling all
maskable interrupts): if the interrupt arrives during
the first 3 cycles of the "ldi" instruction (which is a
4-cycle instruction) the core will switch to interrupt
mode BUT the flags CN and ZN will NOT switch to
the interrupt pair CI and ZI.
User
– User selected registers are saved within the interrupt service routine (normally on a software
stack).
– The source of the interrupt is found by polling the
interrupt flags (if more than one source is associated with the same vector).
– The interrupt is serviced.
– Return from interrupt (RETI)
MCU
– Automatically the MCU switches back to the normal flag set (or the interrupt flag set) and pops
the previous PC value from the stack.
The interrupt routine usually begins by the identifying the device which generated the interrupt request (by polling). The user should save the registers which are used within the interrupt routine in a
software stack. After the RETI instruction is executed, the MCU returns to the main routine.
Figure 20. Interrupt Processing Flow Chart
INSTRUCTION
FETCH
INSTRUCTION
EXECUTE
INSTRUCTION
WAS
THE INSTRUCTION
A RETI ?
LOAD PC FROM
INTERRUPT VECTOR
(FFC/FFD)
NO
YES
YES
SET
INTERRUPT MASK
IS THE CORE
ALREADY IN
NORMAL MODE?
?
NO
CLEAR
INTERRUPT MASK
SELECT
PROGRAM FLAGS
PUSH THE
PC INTO THE STACK
SELECT
INTERNAL MODE FLAG
"POP"
THE STACKED PC
CHECK IF THERE IS
AN INTERRUPT REQUEST
AND INTERRUPT MASK
NO
?
YES
VA000014
31/79
ST62T55CM-Auto ST62T65CM-Auto
INTERRUPTS (Cont’d)
3.4.3 Interrupt Option Register (IOR)
The Interrupt Option Register (IOR) is used to enable/disable the individual interrupt sources and to
select the operating mode of the external interrupt
inputs. This register is write-only and cannot be
accessed by single-bit operations.
Address: 0C8h — Write Only
Reset status: 00h
7
0
-
LES
ESB
GEN
-
-
-
-
Bit 7, Bits 3-0 = Unused.
Bit 6 = LES: Level/Edge Selection bit.
When this bit is set to one, the interrupt source #1
is level sensitive. When cleared to zero the edge
sensitive mode for interrupt request is selected.
Bit 5 = ESB: Edge Selection bit.
The bit ESB selects the polarity of the interrupt
source #2.
Bit 4 = GEN: Global Enable Interrupt. When this bit
is set to one, all interrupts are enabled. When this
bit is cleared to zero all the interrupts (excluding
NMI) are disabled.
When the GEN bit is low, the NMI interrupt is active but cannot cause a wake up from STOP/WAIT
modes.
This register is cleared on reset.
3.4.4 Interrupt sources
Interrupt sources available on these MCUs are
summarized in the Table 9 with associated mask
bit to enable/disable the interrupt request.
Table 9Interrupt Requests and Mask Bits
GENERAL
TIMER
A/D CONVERTER
IOR
TSCR1
ADCR
Address
Register
C8h
D4h
D1h
AR TIMER
ARMC
D5h
SPI
Port PAn
Port PBn
Port PCn
SPIMOD
ORPA-DRPA
ORPB-DRPB
ORPC-DRPC
E2h
C0h-C4h
C1h-C5h
C2h-C6h
Peripheral
32/79
Register
Mask bit
Masked Interrupt Source
GEN
ETI
EAI
OVIE
CPIE
EIE
SPIE
ORPAn-DRPAn
ORPBn-DRPBn
ORPCn-DRPCn
All Interrupts, excluding NMI
TMZ: TIMER Overflow
EOC: End of Conversion
OVF: AR TIMER Overflow
CPF: Successful compare
EF: Active edge on ARTIMin
SPRUN: End of Transmission
PAn pin
PBn pin
PCn pin
Interrupt
vector
Vector 4
Vector 4
Vector 3
Vector 2
Vector 1
Vector 1
Vector 2
ST62T55CM-Auto ST62T65CM-Auto
INTERRUPTS (Cont’d)
Figure 21Interrupt Block Diagram
FROM REGISTER PORT A,B,C
SINGLE BIT ENABLE
PBE
V DD
FF
CLK Q
CLR
PORT A
PORT B
Bits
PBE
0
INT #1 (FF6,7)
I Start MUX
1
1
IOR REG. C8H, bit 6
PORT C
Bits
FF
CLK Q
CLR
PBE
RESTART FROM
STOP/WAIT
INT #2 (FF4,5)
SPIDIV Register
SPINT bit
SPIE bit
IOR REG. C8H, bit 5
I 2 Start
OVF
OVIE
SPIMOD Register
CPF
AR TIMER CPIE
INT #3 (FF2,3)
EF
EIE
TIMER1
TMZ
ETI
ADC
EOC
EAI
VDD
NMI
INT #4 (FF0,1)
FF
CLK Q
CLR
NMI (FFC,D)
I0 Start
Bit GEN (IOR Register)
VA0426K
33/79
ST62T55CM-Auto ST62T65CM-Auto
3.5 POWER SAVING MODES
The WAIT and STOP modes have been implemented in the ST62xx family of MCUs in order to
reduce the product’s electrical consumption during
idle periods. These two power saving modes are
described in the following paragraphs.
3.5.1 WAIT Mode
The MCU goes into WAIT mode as soon as the
WAIT instruction is executed. The microcontroller
can be considered as being in a “software frozen”
state where the core stops processing the program instructions, the RAM contents and peripheral registers are preserved as long as the power
supply voltage is higher than the RAM retention
voltage. In this mode the peripherals are still active.
WAIT mode can be used when the user wants to
reduce the MCU power consumption during idle
periods, while not losing track of time or the capability of monitoring external events. The active oscillator is not stopped in order to provide a clock
signal to the peripherals. Timer counting may be
enabled as well as the Timer interrupt, before entering the WAIT mode: this allows the WAIT mode
to be exited when a Timer interrupt occurs. The
same applies to other peripherals which use the
clock signal.
If the WAIT mode is exited due to a Reset (either
by activating the external pin or generated by the
Watchdog), the MCU enters a normal reset procedure. If an interrupt is generated during WAIT
mode, the MCU’s behaviour depends on the state
34/79
of the processor core prior to the WAIT instruction,
but also on the kind of interrupt request which is
generated. This is described in the following paragraphs. The processor core does not generate a
delay following the occurrence of the interrupt, because the oscillator clock is still available and no
stabilisation period is necessary.
3.5.2 STOP Mode
If the Watchdog is disabled, STOP mode is available. When in STOP mode, the MCU is placed in
the lowest power consumption mode. In this operating mode, the microcontroller can be considered
as being “frozen”, no instruction is executed, the
oscillator is stopped, the RAM contents and peripheral registers are preserved as long as the
power supply voltage is higher than the RAM retention voltage, and the ST62xx core waits for the
occurrence of an external interrupt request or a
Reset to exit the STOP state.
If the STOP state is exited due to a Reset (by activating the external pin) the MCU will enter a normal reset procedure. Behaviour in response to interrupts depends on the state of the processor
core prior to issuing the STOP instruction, and
also on the kind of interrupt request that is generated.
This case will be described in the following paragraphs. The processor core generates a delay after occurrence of the interrupt request, in order to
wait for complete stabilisation of the oscillator, before executing the first instruction.
ST62T55CM-Auto ST62T65CM-Auto
POWER SAVING MODE (Cont’d)
3.5.3 Exit from WAIT and STOP Modes
The following paragraphs describe how the MCU
exits from WAIT and STOP modes, when an interrupt occurs (not a Reset). It should be noted that
the restart sequence depends on the original state
of the MCU (normal, interrupt or non-maskable interrupt mode) prior to entering WAIT or STOP
mode, as well as on the interrupt type.
Interrupts do not affect the oscillator selection.
3.5.3.1 Normal Mode
If the MCU was in the main routine when the WAIT
or STOP instruction was executed, exit from Stop
or Wait mode will occur as soon as an interrupt occurs; the related interrupt routine is executed and,
on completion, the instruction which follows the
STOP or WAIT instruction is then executed, providing no other interrupts are pending.
3.5.3.2 Non Maskable Interrupt Mode
If the STOP or WAIT instruction has been executed during execution of the non-maskable interrupt
routine, the MCU exits from the Stop or Wait mode
as soon as an interrupt occurs: the instruction
which follows the STOP or WAIT instruction is executed, and the MCU remains in non-maskable interrupt mode, even if another interrupt has been
generated.
3.5.3.3 Normal Interrupt Mode
If the MCU was in interrupt mode before the STOP
or WAIT instruction was executed, it exits from
STOP or WAIT mode as soon as an interrupt occurs. Nevertheless, two cases must be considered:
– If the interrupt is a normal one, the interrupt routine in which the WAIT or STOP mode was en-
tered will be completed, starting with the
execution of the instruction which follows the
STOP or the WAIT instruction, and the MCU is
still in the interrupt mode. At the end of this routine pending interrupts will be serviced in accordance with their priority.
– In the event of a non-maskable interrupt, the
non-maskable interrupt service routine is processed first, then the routine in which the WAIT or
STOP mode was entered will be completed by
executing the instruction following the STOP or
WAIT instruction. The MCU remains in normal
interrupt mode.
Notes:
To achieve the lowest power consumption during
RUN or WAIT modes, the user program must take
care of:
– configuring unused I/Os as inputs without pull-up
(these should be externally tied to well defined
logic levels);
– placing all peripherals in their power down
modes before entering STOP mode;
When the hardware activated Watchdog is selected, or when the software Watchdog is enabled, the
STOP instruction is disabled and a WAIT instruction will be executed in its place.
If all interrupt sources are disabled (GEN low), the
MCU can only be restarted by a Reset. Although
setting GEN low does not mask the NMI as an interrupt, it will stop it generating a wake-up signal.
The WAIT and STOP instructions are not executed if an enabled interrupt request is pending.
35/79
ST62T55CM-Auto ST62T65CM-Auto
4 ON-CHIP PERIPHERALS
4.1 I/O PORTS
The MCU features Input/Output lines which may
be individually programmed as any of the following
input or output configurations:
– Input without pull-up or interrupt
– Input with pull-up and interrupt
– Input with pull-up, but without interrupt
– Analog input
– Push-pull output
– Open drain output
The lines are organised as bytewise Ports.
Each port is associated with 3 registers in Data
space. Each bit of these registers is associated
with a particular line (for instance, bits 0 of Port A
Data, Direction and Option registers are associated with the PA0 line of Port A).
The DATA registers (DRx), are used to read the
voltage level values of the lines which have been
configured as inputs, or to write the logic value of
the signal to be output on the lines configured as
outputs. The port data registers can be read to get
the effective logic levels of the pins, but they can
be also written by user software, in conjunction
with the related option registers, to select the different input mode options.
Single-bit operations on I/O registers are possible
but care is necessary because reading in input
mode is done from I/O pins while writing will directly affect the Port data register causing an undesired change of the input configuration.
The Data Direction registers (DDRx) allow the
data direction (input or output) of each pin to be
set.
The Option registers (ORx) are used to select the
different port options available both in input and in
output mode.
All I/O registers can be read or written to just as
any other RAM location in Data space, so no extra
RAM cells are needed for port data storage and
manipulation. During MCU initialization, all I/O registers are cleared and the input mode with pull-ups
and no interrupt generation is selected for all the
pins, thus avoiding pin conflicts.
Figure 22. I/O Port Block Diagram
SIN CONTROLS
RESET
VDD
DATA
DIRECTION
REGISTER
VDD
INPUT/OUTPUT
DATA
REGISTER
SHIFT
REGISTER
OPTION
REGISTER
SOUT
TO INTERRUPT
TO ADC
36/79
VA00413
ST62T55CM-Auto ST62T65CM-Auto
I/O PORTS (Cont’d)
4.1.1 Operating Modes
Each pin may be individually programmed as input
or output with various configurations.
This is achieved by writing the relevant bit in the
Data (DR), Data Direction (DDR) and Option registers (OR). Table 10 illustrates the various port
configurations which can be selected by user software.
4.1.1.1 Input Options
Pull-up, High Impedance Option. All input lines
can be individually programmed with or without an
internal pull-up by programming the OR and DR
registers accordingly. If the pull-up option is not
selected, the input pin will be in the high-impedance state.
4.1.1.2 Interrupt Options
All input lines can be individually connected by
software to the interrupt system by programming
the OR and DR registers accordingly. The interrupt trigger modes (falling edge, rising edge and
low level) can be configured by software as described in the Interrupt Chapter for each port.
4.1.1.3 Analog Input Options
Some pins can be configured as analog inputs by
programming the OR and DR registers accordingly. These analog inputs are connected to the onchip 8-bit Analog to Digital Converter. ONLY ONE
pin should be programmed as an analog input at
any time, since by selecting more than one input
simultaneously their pins will be effectively shorted.
Table 10. I/O Port Option Selection
DDR
OR
DR
Mode
0
0
0
Input
With pull-up, no interrupt
Option
0
0
1
Input
No pull-up, no interrupt
0
1
0
Input
With pull-up and with interrupt
0
1
1
Input
Analog input (when available)
1
0
X
Output
Open-drain output (20mA sink when available)
1
1
X
Output
Push-pull output (20mA sink when available)
Note: X = Don’t care
37/79
ST62T55CM-Auto ST62T65CM-Auto
I/O PORTS (Cont’d)
4.1.2 Safe I/O State Switching Sequence
Switching the I/O ports from one state to another
should be done in a sequence which ensures that
no unwanted side effects can occur. The recommended safe transitions are illustrated in Figure
23. All other transitions are potentially risky and
should be avoided when changing the I/O operating mode, as it is most likely that undesirable sideeffects will be experienced, such as spurious interrupt generation or two pins shorted together by the
analog multiplexer.
Single bit instructions (SET, RES, INC and DEC)
should be used with great caution on Ports Data
registers, since these instructions make an implicit
read and write back of the entire register. In port
input mode, however, the data register reads from
the input pins directly, and not from the data register latches. Since data register information in input
mode is used to set the characteristics of the input
pin (interrupt, pull-up, analog input), these may be
unintentionally reprogrammed depending on the
state of the input pins. As a general rule, it is better
to limit the use of single bit instructions on data
registers to when the whole (8-bit) port is in output
mode. In the case of inputs or of mixed inputs and
outputs, it is advisable to keep a copy of the data
register in RAM. Single bit instructions may then
be used on the RAM copy, after which the whole
copy register can be written to the port data register:
SET bit, datacopy
LD a, datacopy
LD DRA, a
Warning: Care must also be taken to not use instructions that act on a whole port register (INC,
DEC, or read operations) when all 8 bits are not
available on the device. Unavailable bits must be
masked by software (AND instruction).
The WAIT and STOP instructions allow the
ST62xx to be used in situations where low power
consumption is needed. The lowest power consumption is achieved by configuring I/Os in input
mode with well-defined logic levels.
The user must take care not to switch outputs with
heavy loads during the conversion of one of the
analog inputs in order to avoid any disturbance to
the conversion.
Figure 23. Diagram showing Safe I/O State Transitions
Interrupt
pull-up
010*
011
Input
Analog
Input
pull-up (Reset
state)
000
001
Input
Output
Open Drain
100
101
Output
Open Drain
Output
Push-pull
110
111
Output
Push-pull
Note *. xxx = DDR, OR, DR Bits respectively
38/79
ST62T55CM-Auto ST62T65CM-Auto
I/O PORTS (Cont’d)
Table 11I/O Port Option Selections
MODE
AVAILABLE ON(1)
SCHEMATIC
PA0-PA7
Input
PB0-PB5, PB6-PB7
Data in
PC0-PC4
Interrupt
Input
with pull up
PA0-PA7
PB0-PB5, PB6-PB7
Data in
PC0-PC4
Interrupt
Input
with pull up
with interrupt
PA0-PA7
PB0-PB5, PB6-PB7
Data in
PC0-PC4
Interrupt
Analog Input
PA0-PA7
PC0-PC4
Open drain output
PA0-PA7
5mA
PC0-PC4
ADC
Data out
Open drain output
PB0-PB5, PB6-PB7
30mA
Push-pull output
PA0-PA7
5mA
PC0-PC4
Data out
Push-pull output
PB0-PB5, PB6-PB7
30mA
Note 1. Provided the correct configuration has been selected.
39/79
ST62T55CM-Auto ST62T65CM-Auto
I/O PORTS (Cont’d)
4.1.3 Timer 1 Alternate function Option
When bit TOUT of register TSCR1 is low, pin PC1/
Timer 1 is configured through the port registers as
any standard pin of Port B. It is in addition connected to the Timer 1 input for Gated and Event counter modes. When bit TOUT of register TSCR1 is
high, pin PC1/Timer 1 is forced as Timer 1 output,
independently of the port registers configuration.
4.1.4 AR Timer Alternate function Option
When bit PWMOE of register ARMC is low, pin ARTIMout/PB7 is configured as any standard pin of
port B through the port registers. When PWMOE is
high, ARTIMout/PB7 is the PWM output, independently of the port registers configuration.
ARTIMin/PB6 is connected to the AR Timer input.
It is configured through the port registers as any
standard pin of port B. To use ARTIMin/PB6 as AR
Timer input, it must be configured as input through
DDRB.
40/79
4.1.5 SPI Alternate function Option
PC2/PC4 are used as standard I/O as long as bit
SPCLK of the SPI Mode Register is kept low.
When PC2/Sin is configured as input, it is automatically connected to the SPI shift register input, independent of the state at SPCLK.
PC3/SOUT is configured as SPI push-pull output
by setting bit 0 of the Miscellaneous register (address DDh), regardless of the state of Port C registers. PC4/SCK is configured as push-pull output
clock (master mode) by programming it as pushpull output through DDRC register and by setting
bit SPCLK of the SPI Mode Register.
PC4/SCK is configured as input clock (slave mode)
by programming it as input through DDRC register
and by clearing bit SPCLK of the SPI Mode Register. With this configuration, PC4 can simultaneously be used as an input.
ST62T55CM-Auto ST62T65CM-Auto
I/O PORTS (Cont’d)
Figure 24Peripheral Interface Configuration of SPI, Timer 1 and AR Timer
VDD
PP/OD
PC3/Sout
MUX
OUT
1
0
DR
b0
MISC.
REGISTER
OR
IN
DR
PC2/Sin
SPI
CLOCK IN
PC4/SCK
MUX
CLOCK OUT
1
0
DR
SPCLK
MOD REGISTER
OR
IN
OR
TOUT
PC1/TIM1
TIMER 1
OUT
1
MUX
0
DR
ARTIMin
ARTIMin
DR
AR TIMER
OR
PWMOE
PP/OD
ARTIMout
MUX
1
0
ARTIMout
DR
VR0C1661
41/79
ST62T55CM-Auto ST62T65CM-Auto
4.2 TIMER
The MCU features an on-chip Timer peripheral,
consisting of an 8-bit counter with a 7-bit programmable prescaler, giving a maximum count of 215.
The peripheral may be configured in three different
operating modes.
Figure 25 shows the Timer Block Diagram. The
external TIMER pin is available to the user. The
content of the 8-bit counter can be read/written in
the Timer/Counter register, TCR, while the state of
the 7-bit prescaler can be read in the PSC register.
The control logic device is managed in the TSCR
register as described in the following paragraphs.
The 8-bit counter is decremented by the output
(rising edge) coming from the 7-bit prescaler and
can be loaded and read under program control.
When it decrements to zero then the TMZ (Timer
Zero) bit in the TSCR is set to “1”. If the ETI (Enable Timer Interrupt) bit in the TSCR is also set to
“1”, an interrupt request is generated as described
in the Interrupt Chapter. The Timer interrupt can
be used to exit the MCU from WAIT mode.
The prescaler input can be the internal frequency
fINT divided by 12 or an external clock applied to
the TIMER pin. The prescaler decrements on the
rising edge. Depending on the division factor programmed by PS2, PS1 and PS0 bits in the TSCR.
The clock input of the timer/counter register is multiplexed to different sources. For division factor 1,
the clock input of the prescaler is also that of timer/
counter; for factor 2, bit 0 of the prescaler register
is connected to the clock input of TCR. This bit
changes its state at half the frequency of the prescaler input clock. For factor 4, bit 1 of the PSC is
connected to the clock input of TCR, and so forth.
The prescaler initialize bit, PSI, in the TSCR register must be set to “1” to allow the prescaler (and
hence the counter) to start. If it is cleared to “0”, all
the prescaler bits are set to “1” and the counter is
inhibited from counting. The prescaler can be
loaded with any value between 0 and 7Fh, if bit
PSI is set to “1”. The prescaler tap is selected by
means of the PS2/PS1/PS0 bits in the control register.
Figure 26 illustrates the Timer’s working principle.
Figure 25. Timer Block Diagram
DATABUS 8
8
PSC
8
6
5
4
3
2
1
0
SELECT
1 OF 7
8
b7
8-BIT
COUNTER
b6
b5
b4
b3
b2
b1
b0
STATUS/CONTROL
REGISTER
TMZ ETI
TOUT
DOUT
PSI
PS2
PS1
PS0
3
TIMER
INTERRUPT
LINE
SYNCHRONIZATION
LOGIC
fOSC
42/79
LATCH
:12
VA00009
ST62T55CM-Auto ST62T65CM-Auto
TIMER (Cont’d)
4.2.1 Timer Operating Modes
There are three operating modes, which are selected by the TOUT and DOUT bits (see TSCR
register). These three modes correspond to the
two clocks which can be connected to the 7-bit
prescaler (fINT ÷ 12 or TIMER pin signal), and to
the output mode.
4.2.1.1 Gated Mode
(TOUT = “0”, DOUT = “1”)
In this mode the prescaler is decremented by the
Timer clock input (fINT ÷ 12), but ONLY when the
signal on the TIMER pin is held high (allowing
pulse width measurement). This mode is selected
by clearing the TOUT bit in the TSCR register to
“0” (i.e. as input) and setting the DOUT bit to “1”.
PC1 must be configured in input mode
4.2.1.2 Event Counter Mode
(TOUT = “0”, DOUT = “0”)
In this mode, the TIMER pin is the input clock of
the prescaler which is decremented on the rising
edge.
4.2.1.3 Output Mode
(TOUT = “1”, DOUT = data out)
The TIMER pin is connected to the DOUT latch,
hence the Timer prescaler is clocked by the prescaler clock input (fINT ÷ 12).
The user can select the desired prescaler division
ratio through the PS2, PS1, PS0 bits. When the
TCR count reaches 0, it sets the TMZ bit in the
TSCR. The TMZ bit can be tested under program
control to perform a timer function whenever it
goes high. The low-to-high TMZ bit transition is
used to latch the DOUT bit of the TSCR and transfer it to the TIMER pin. This operating mode allows
external signal generation on the TIMER pin.
Table 12. Timer Operating Modes
TOUT
0
0
1
1
DOUT
0
1
0
1
Timer Pin
Input
Input
Output
Output
Timer Function
Event Counter
Gated Input
Output “0”
Output “1”
4.2.2 Timer Interrupt
When the counter register decrements to zero with
the ETI (Enable Timer Interrupt) bit set to one, an
interrupt request is generated as described in the
Interrupt Chapter. When the counter decrements
to zero, the TMZ bit in the TSCR register is set to
one.
Figure 26. Timer Working Principle
7-BIT PRESCALER
BIT0
CLOCK
0
BIT1
BIT2
2
1
BIT3
BIT4
4
3
8-1 MULTIPLEXER
BIT5
BIT6
7
6
5
PS0
PS1
PS2
BIT0
BIT1
BIT2
BIT3
BIT4
BIT5
BIT6
BIT7
8-BIT COUNTER
VA00186
43/79
ST62T55CM-Auto ST62T65CM-Auto
TIMER (Cont’d)
4.2.3 Application Notes
The user can select the presence of an on-chip
pull-up on the TIMER pin as option.
TMZ is set when the counter reaches zero; however, it may also be set by writing 00h in the TCR
register or by setting bit 7 of the TSCR register.
The TMZ bit must be cleared by user software
when servicing the timer interrupt to avoid undesired interrupts when leaving the interrupt service
routine. After reset, the 8-bit counter register is
loaded with 0FFh, while the 7-bit prescaler is loaded with 07Fh, and the TSCR register is cleared.
This means that the Timer is stopped (PSI=“0”)
and the timer interrupt is disabled.
If the Timer is programmed in output mode, the
DOUT bit is transferred to the TIMER pin when
TMZ is set to one (by software or due to counter
decrement). When TMZ is high, the latch is transparent and DOUT is copied to the timer pin. When
TMZ goes low, DOUT is latched.
A write to the TCR register will predominate over
the 8-bit counter decrement to 00h function, i.e. if a
write and a TCR register decrement to 00h occur
simultaneously, the write will take precedence,
and the TMZ bit is not set until the 8-bit counter
reaches 00h again. The values of the TCR and the
PSC registers can be read accurately at any time.
4.2.4 Timer Registers
Timer Status Control Register (TSCR)
Address: 0D4h — Read/Write
7
TMZ
0
ETI
TOUT DOUT
PSI
PS2
PS1
PS0
When low, this bit selects the input mode for the
TIMER pin. When high the output mode is selected.
Bit 4 = DOUT: Data Output
Data sent to the timer output when TMZ is set high
(output mode only). Input mode selection (input
mode only).
Bit 3 = PSI: Prescaler Initialize Bit
Used to initialize the prescaler and inhibit its counting. When PSI=“0” the prescaler is set to 7Fh and
the counter is inhibited. When PSI=“1” the prescaler is enabled to count downwards. As long as
PSI=“0” both counter and prescaler are not running.
Bit 2, 1, 0 = PS2, PS1, PS0: Prescaler Mux. Select. These bits select the division ratio of the prescaler register.
Table 13Prescaler Division Factors
PS2
0
0
0
0
1
1
1
1
PS1
0
0
1
1
0
0
1
1
PS0
0
1
0
1
0
1
0
1
Divided by
1
2
4
8
16
32
64
128
Timer Counter Register TCR
Address: 0D3h — Read/Write
7
Bit 7 = TMZ: Timer Zero bit
A low-to-high transition indicates that the timer
count register has decrement to zero. This bit must
be cleared by user software before starting a new
count.
Bit 6 = ETI: Enable Timer Interrupt
When set, enables the timer interrupt request
(vector #4). If ETI=0 the timer interrupt is disabled.
If ETI=1 and TMZ=1 an interrupt request is generated.
Bit 5 = TOUT: Timers Output Control
D7
0
D6
D5
D4
D3
D1
D0
Bit 7-0 = D7-D0: Counter Bits.
Prescaler Register PSC
Address: 0D2h — Read/Write
7
D7
0
D6
D5
D4
D3
Bit 7 = D7: Always read as "0".
Bit 6-0 = D6-D0: Prescaler Bits.
44/79
D2
D2
D1
D0
ST62T55CM-Auto ST62T65CM-Auto
4.3 AUTO-RELOAD TIMER
The Auto-Reload Timer (AR Timer) on-chip peripheral consists of an 8-bit timer/counter with
compare and capture/reload capabilities and of a
7-bit prescaler with a clock multiplexer, enabling
the clock input to be selected as fINT, fINT/3 or an
external clock source. A Mode Control Register,
ARMC, two Status Control Registers, ARSC0 and
ARSC1, an output pin, ARTIMout, and an input
pin, ARTIMin, allow the Auto-Reload Timer to be
used in 4 modes:
– Auto-reload (PWM generation),
– Output compare and reload on external event
(PLL),
– Input capture and output compare for time measurement.
– Input capture and output compare for period
measurement.
The AR Timer can be used to wake the MCU from
WAIT mode either with an internal or with an external clock. It also can be used to wake the MCU
from STOP mode, if used with an external clock
signal connected to the ARTIMin pin. A Load register allows the program to read and write the
counter on the fly.
4.3.1 AR Timer Description
The AR COUNTER is an 8-bit up-counter incremented on the input clock’s rising edge. The counter is loaded from the ReLoad/Capture Register,
ARRC, for auto-reload or capture operations, as
well as for initialization. Direct access to the AR
counter is not possible; however, by reading or
writing the ARLR load register, it is possible to
read or write the counter’s contents on the fly.
The AR Timer’s input clock can be either the internal clock (from the Oscillator Divider), the internal
clock divided by 3, or the clock signal connected to
the ARTIMin pin. Selection between these clock
sources is effected by suitably programming bits
CC0-CC1 of the ARSC1 register. The output of the
AR Multiplexer feeds the 7-bit programmable AR
Prescaler, ARPSC, which selects one of the 8
available taps of the prescaler, as defined by
PSC0-PSC2 in the AR Mode Control Register.
Thus the division factor of the prescaler can be set
to 2n (where n = 0, 1,..7).
The clock input to the AR counter is enabled by the
TEN (Timer Enable) bit in the ARMC register.
When TEN is reset, the AR counter is stopped and
the prescaler and counter contents are frozen.
When TEN is set, the AR counter runs at the rate
of the selected clock source. The counter is
cleared on system reset.
The AR counter may also be initialized by writing
to the ARLR load register, which also causes an
immediate copy of the value to be placed in the AR
counter, regardless of whether the counter is running or not. Initialization of the counter, by either
method, will also clear the ARPSC register, whereupon counting will start from a known value.
4.3.2 Timer Operating Modes
Four different operating modes are available for
the AR Timer:
Auto-reload Mode with PWM Generation. This
mode allows a Pulse Width Modulated signal to be
generated on the ARTIMout pin with minimum
Core processing overhead.
The free running 8-bit counter is fed by the prescaler’s output, and is incremented on every rising
edge of the clock signal.
When a counter overflow occurs, the counter is
automatically reloaded with the contents of the Reload/Capture Register, ARCC, and ARTIMout is
set. When the counter reaches the value contained in the compare register (ARCP), ARTIMout
is reset.
On overflow, the OVF flag of the ARSC0 register is
set and an overflow interrupt request is generated
if the overflow interrupt enable bit, OVIE, in the
Mode Control Register (ARMC), is set. The OVF
flag must be reset by the user software.
When the counter reaches the compare value, the
CPF flag of the ARSC0 register is set and a compare interrupt request is generated, if the Compare
Interrupt enable bit, CPIE, in the Mode Control
Register (ARMC), is set. The interrupt service routine may then adjust the PWM period by loading a
new value into ARCP. The CPF flag must be reset
by user software.
The PWM signal is generated on the ARTIMout
pin (refer to the Block Diagram). The frequency of
this signal is controlled by the prescaler setting
and by the auto-reload value present in the Reload/Capture register, ARRC. The duty cycle of
the PWM signal is controlled by the Compare Register, ARCP.
45/79
ST62T55CM-Auto ST62T65CM-Auto
AUTO-RELOAD TIMER (Cont’d)
Figure 27. AR Timer Block Diagram
DATA BUS
DDRB7
8
DRB7
AR COMPARE
REGISTER
8
PB7/
ARTIMout
CPF
COMPARE
R
S
8
f INT
M
f INT /3
U
PWMOE
OVF
8-Bit
7-Bit
AR PRESCALER
AR COUNTER
X
CC0-CC1
OVF
OVIE
LOAD
PS0-PS2
TCLD
EIE
EF
8
CPF
AR TIMER
INTERRUPT
CPIE
8
8
AR
AR
PB6/
ARTIMin
SL0-SL1
EF
SYNCHRO
RELOAD/CAPTURE
LOAD
REGISTER
REGISTER
8
8
DATA BUS
VR01660A
46/79
ST62T55CM-Auto ST62T65CM-Auto
AUTO-RELOAD TIMER (Cont’d)
It should be noted that the reload values will also
affect the value and the resolution of the duty cycle
of PWM output signal. To obtain a signal on ARTIMout, the contents of the ARCP register must be
greater than the contents of the ARRC register.
The maximum available resolution for the ARTIMout duty cycle is:
Resolution = 1/[256-(ARRC)]
Where ARRC is the content of the Reload/Capture
register. The compare value loaded in the Compare Register, ARCP, must be in the range from
(ARRC) to 255.
The ARTC counter is initialized by writing to the
ARRC register and by then setting the TCLD (Timer Load) and the TEN (Timer Clock Enable) bits in
the Mode Control register, ARMC.
Enabling and selection of the clock source is controlled by the CC0, CC1, SL0 and SL1 bits in the
Status Control Register, ARSC1. The prescaler division ratio is selected by the PS0, PS1 and PS2
bits in the ARSC1 register.
In Auto-reload Mode, any of the three available
clock sources can be selected: Internal Clock, Internal Clock divided by 3 or the clock signal
present on the ARTIMin pin.
Figure 28. Auto-reload Timer PWM Function
COUNTER
255
COMPARE
VALUE
RELOAD
REGISTER
000
PWM OUTPUT
t
tHIGH
tLOW
t
VR001852
47/79
ST62T55CM-Auto ST62T65CM-Auto
AUTO-RELOAD TIMER (Cont’d)
Capture Mode with PWM Generation. In this
mode, the AR counter operates as a free running
8-bit counter fed by the prescaler output. The
counter is incremented on every clock rising edge.
An 8-bit capture operation from the counter to the
ARRC register is performed on every active edge
on the ARTIMin pin, when enabled by Edge Control bits SL0, SL1 in the ARSC1 register. At the
same time, the External Flag, EF, in the ARSC0
register is set and an external interrupt request is
generated if the External Interrupt Enable bit, EIE,
in the ARMC register, is set. The EF flag must be
reset by user software.
Each ARTC overflow sets ARTIMout, while a
match between the counter and ARCP (Compare
Register) resets ARTIMout and sets the compare
flag, CPF. A compare interrupt request is generated if the related compare interrupt enable bit,
CPIE, is set. A PWM signal is generated on ARTIMout. The CPF flag must be reset by user software.
The frequency of the generated signal is determined by the prescaler setting. The duty cycle is
determined by the ARCP register.
Initialization and reading of the counter are identical to the auto-reload mode (see previous description).
Enabling and selection of clock sources is controlled by the CC0 and CC1 bits in the AR Status Control Register, ARSC1.
The prescaler division ratio is selected by programming the PS0, PS1 and PS2 bits in the
ARSC1 Register.
In Capture mode, the allowed clock sources are
the internal clock and the internal clock divided by
3; the external ARTIMin input pin should not be
used as a clock source.
Capture Mode with Reset of counter and prescaler, and PWM Generation. This mode is identical to the previous one, with the difference that a
capture condition also resets the counter and the
prescaler, thus allowing easy measurement of the
time between two captures (for input period measurement on the ARTIMin pin).
Note: In this mode it is recommended not to
change the ARTimer counter value from FFH to
any other value by writing this value in the ARRC
register and setting the TLCD bit in the ARMC register.
48/79
Load on External Input. The counter operates as
a free running 8-bit counter fed by the prescaler.
the count is incremented on every clock rising
edge.
Each counter overflow sets the ARTIMout pin. A
match between the counter and ARCP (Compare
Register) resets the ARTIMout pin and sets the
compare flag, CPF. A compare interrupt request is
generated if the related compare interrupt enable
bit, CPIE, is set. A PWM signal is generated on
ARTIMout. The CPF flag must be reset by user
software.
Initialization of the counter is as described in the
previous paragraph. In addition, if the external ARTIMin input is enabled, an active edge on the input
pin will copy the contents of the ARRC register into
the counter, whether the counter is running or not.
Notes:
The allowed AR Timer clock sources are the following:
AR Timer Mode
Auto-reload mode
Capture mode
Capture/Reset mode
External Load mode
Clock Sources
fINT, fINT/3, ARTIMin
fINT, fINT/3
fINT, fINT/3
fINT, fINT/3
The clock frequency should not be modified while
the counter is counting, since the counter may be
set to an unpredictable value. For instance, the
multiplexer setting should not be modified while
the counter is counting.
Loading of the counter by any means (by auto-reload, through ARLR, ARRC or by the Core) resets
the prescaler at the same time.
Care should be taken when both the Capture interrupt and the Overflow interrupt are used. Capture
and overflow are asynchronous. If the capture occurs when the Overflow Interrupt Flag, OVF, is
high (between counter overflow and the flag being
reset by software, in the interrupt routine), the External Interrupt Flag, EF, may be cleared simultaneusly without the interrupt being taken into account.
The solution consists in resetting the OVF flag by
writing 06h in the ARSC0 register. The value of EF
is not affected by this operation. If an interrupt has
occured, it will be processed when the MCU exits
from the interrupt routine (the second interrupt is
latched).
ST62T55CM-Auto ST62T65CM-Auto
AUTO-RELOAD TIMER (Cont’d)
4.3.3 AR Timer Registers
AR Mode Control Register (ARMC)
Address: D5h — Read/Write
Reset status: 00h
7
TCLD
0
TEN
PWMOE
EIE
CPIE
OVIE ARMC1 ARMC0
The AR Mode Control Register ARMC is used to
program the different operating modes of the AR
Timer, to enable the clock and to initialize the
counter. It can be read and written to by the Core
and it is cleared on system reset (the AR Timer is
disabled).
Note: Care should be taken when writing to the
ARMC register while AR Timer is running: if a
PWM signal is being output while the ARMC register is overwritten with its previous value, ARTIMout
pin remains at its previous state for a programmed
time equal to tHIGH (refer to Figure 28). Then, a
new count starts.
Bit 7 = TLCD: Timer Load Bit. This bit, when set,
will cause the contents of ARRC register to be
loaded into the counter and the contents of the
prescaler register, ARPSC, are cleared in order to
initialize the timer before starting to count. This bit
is write-only and any attempt to read it will yield a
logical zero.
Bit 6 = TEN: Timer Clock Enable. This bit, when
set, allows the timer to count. When cleared, it will
stop the timer and freeze ARPSC and ARTSC.
Bit 5 = PWMOE: PWM Output Enable. This bit,
when set, enables the PWM output on the ARTIMout pin. When reset, the PWM output is disabled.
Bit 4 = EIE: External Interrupt Enable. This bit,
when set, enables the external interrupt request.
When reset, the external interrupt request is
masked. If EIE is set and the related flag, EF, in
the ARSC0 register is also set, an interrupt request is generated.
Bit 3 = CPIE: Compare Interrupt Enable. This bit,
when set, enables the compare interrupt request.
If CPIE is reset, the compare interrupt request is
masked. If CPIE is set and the related flag, CPF, in
the ARSC0 register is also set, an interrupt request is generated.
Bit 2 = OVIE: Overflow Interrupt. This bit, when
set, enables the overflow interrupt request. If OVIE
is reset, the compare interrupt request is masked.
If OVIE is set and the related flag, OVF in the
ARSC0 register is also set, an interrupt request is
generated.
Bit 1-0 = ARMC1-ARMC0: Mode Control Bits 1-0.
These are the operating mode control bits. The following bit combinations will select the various operating modes:
ARMC1
0
0
ARMC0
0
1
1
0
1
1
Operating Mode
Auto-reload Mode
Capture Mode
Capture Mode with Reset
of ARTC and ARPSC
Load on External Edge
Mode
AR Timer Status/Control Registers ARSC0 &
ARSC1. These registers contain the AR Timer status information bits and also allow the programming of clock sources, active edge and prescaler
multiplexer setting.
ARSC0 register bits 0,1 and 2 contain the interrupt
flags of the AR Timer. These bits are read normally. Each one may be reset by software. Writing a
one does not affect the bit value.
AR Status Control Register 0 (ARSC0)
Address: D6h — Read/Clear
7
D7
0
D6
D5
D4
D3
EF
CPF
OVF
Bits 7-3 = D7-D3: Unused
Bit 2 = EF: External Interrupt Flag. This bit is set by
any active edge on the external ARTIMin input pin.
The flag is cleared by writing a zero to the EF bit.
Bit 1 = CPF: Compare Interrupt Flag. This bit is set
if the contents of the counter and the ARCP register are equal. The flag is cleared by writing a zero
to the CPF bit.
Bit 0 = OVF: Overflow Interrupt Flag. This bit is set
by a transition of the counter from FFh to 00h
(overflow). The flag is cleared by writing a zero to
the OVF bit.
49/79
ST62T55CM-Auto ST62T65CM-Auto
AUTO-RELOAD TIMER (Cont’d)
AR Status Control Register 1(ARSC1)
Address: D7h — Read/Write
7
0
PS2
PS1
PS0
D4
SL1
SL0
CC1
CC0
Bist 7-5 = PS2-PS0: Prescaler Division Selection
Bits 2-0. These bits determine the Prescaler division ratio. The prescaler itself is not affected by
these bits. The prescaler division ratio is listed in the
following table:
Table 14. Prescaler Division Ratio Selection
PS2
0
PS1
0
PS0
0
ARPSC Division Ratio
1
0
0
1
2
0
1
0
4
0
1
1
8
1
0
0
16
1
0
1
32
1
1
0
64
1
1
1
128
Bit 4 = D4: Reserved. Must be kept reset.
Bit 3-2 = SL1-SL0: Timer Input Edge Control Bits 10. These bits control the edge function of the Timer
input pin for external synchronization. If bit SL0 is reset, edge detection is disabled; if set edge detection
is enabled. If bit SL1 is reset, the AR Timer input pin
is rising edge sensitive; if set, it is falling edge sensitive.
SL1
X
0
1
SL0
0
1
1
Edge Detection
Disabled
Rising Edge
Falling Edge
Bit 1-0 = CC1-CC0: Clock Source Select Bit 1-0.
These bits select the clock source for the AR Timer
through the AR Multiplexer. The programming of
the clock sources is explained in the following Table
15:
Table 15. Clock Source Selection.
CC1
0
0
1
1
50/79
CC0
0
1
0
1
Clock Source
Fint
Fint Divided by 3
ARTIMin Input Clock
Reserved
AR Load Register ARLR. The ARLR load register
is used to read or write the ARTC counter register
“on the fly” (while it is counting). The ARLR register is not affected by system reset.
AR Load Register (ARLR)
Address: DBh — Read/Write
7
D7
0
D6
D5
D4
D3
D2
D1
D0
Bit 7-0 = D7-D0: Load Register Data Bits. These
are the load register data bits.
AR Reload/Capture Register. The ARRC reload/
capture register is used to hold the auto-reload
value which is automatically loaded into the counter when overflow occurs.
AR Reload/Capture (ARRC)
Address: D9h — Read/Write
7
D7
0
D6
D5
D4
D3
D2
D1
D0
Bit 7-0 = D7-D0: Reload/Capture Data Bits. These
are the Reload/Capture register data bits.
AR Compare Register. The CP compare register
is used to hold the compare value for the compare
function.
AR Compare Register (ARCP)
Address: DAh — Read/Write
7
D7
0
D6
D5
D4
D3
D2
D1
D0
Bit 7-0 = D7-D0: Compare Data Bits. These are
the Compare register data bits.
ST62T55CM-Auto ST62T65CM-Auto
4.4 A/D CONVERTER (ADC)
The A/D converter peripheral is an 8-bit analog to
digital converter with analog inputs as alternate I/O
functions (the number of which is device dependent), offering 8-bit resolution with a typical conversion time of 70us (at an oscillator clock frequency
of 8MHz).
The ADC converts the input voltage by a process
of successive approximations, using a clock frequency derived from the oscillator with a division
factor of twelve. With an oscillator clock frequency
less than 1.2MHz, conversion accuracy is decreased.
Selection of the input pin is done by configuring
the related I/O line as an analog input via the Option and Data registers (refer to I/O ports description for additional information). Only one I/O line
must be configured as an analog input at any time.
The user must avoid any situation in which more
than one I/O pin is selected as an analog input simultaneously, to avoid device malfunction.
The ADC uses two registers in the data space: the
ADC data conversion register, ADR, which stores
the conversion result, and the ADC control register, ADCR, used to program the ADC functions.
A conversion is started by writing a “1” to the Start
bit (STA) in the ADC control register. This automatically clears (resets to “0”) the End Of Conversion Bit (EOC). When a conversion is complete,
the EOC bit is automatically set to “1”, in order to
flag that conversion is complete and that the data
in the ADC data conversion register is valid. Each
conversion has to be separately initiated by writing
to the STA bit.
The STA bit is continuously scanned so that, if the
user sets it to “1” while a previous conversion is in
progress, a new conversion is started before completing the previous one. The start bit (STA) is a
write only bit, any attempt to read it will show a logical “0”.
The A/D converter features a maskable interrupt
associated with the end of conversion. This interrupt is associated with interrupt vector #4 and occurs when the EOC bit is set (i.e. when a conversion is completed). The interrupt is masked using
the EAI (interrupt mask) bit in the control register.
The power consumption of the device can be reduced by turning off the ADC peripheral. This is
done by setting the PDS bit in the ADC control register to “0”. If PDS=“1”, the A/D is powered and enabled for conversion. This bit must be set at least
one instruction before the beginning of the conver-
sion to allow stabilisation of the A/D converter.
This action is also needed before entering WAIT
mode, since the A/D comparator is not automatically disabled in WAIT mode.
During Reset, any conversion in progress is
stopped, the control register is reset to 40h and the
ADC interrupt is masked (EAI=0).
Figure 29. ADC Block Diagram
Ain
CONVERTER
INTERRUPT
CLOCK
RESET
AVSS
AVDD
CONTROL REGISTER
RESULT REGISTER
8
8
CORE
CONTROL SIGNALS
CORE
VA00418
4.4.1 Application Notes
The A/D converter does not feature a sample and
hold circuit. The analog voltage to be measured
should therefore be stable during the entire conversion cycle. Voltage variation should not exceed
±1/2 LSB for the optimum conversion accuracy. A
low pass filter may be used at the analog input
pins to reduce input voltage variation during conversion.
When selected as an analog channel, the input pin
is internally connected to a capacitor Cad of typically 12pF. For maximum accuracy, this capacitor
must be fully charged at the beginning of conversion. In the worst case, conversion starts one instruction (6.5 µs) after the channel has been selected. In worst case conditions, the impedance,
ASI, of the analog voltage source is calculated using the following formula:
6.5µs = 9 x Cad x ASI
(capacitor charged to over 99.9%), i.e. 30 kΩ including a 50% guardband. ASI can be higher if Cad
has been charged for a longer period by adding instructions before the start of conversion (adding
more than 26 CPU cycles is pointless).
51/79
ST62T55CM-Auto ST62T65CM-Auto
A/D CONVERTER (Cont’d)
Since the ADC is on the same chip as the microprocessor, the user should not switch heavily loaded output signals during conversion, if high precision is required. Such switching will affect the supply voltages used as analog references.
The accuracy of the conversion depends on the
quality of the power supplies (VDD and VSS). The
user must take special care to ensure a well regulated reference voltage is present on the VDD and
VSS pins (power supply voltage variations must be
less than 5V/ms). This implies, in particular, that a
suitable decoupling capacitor is used at the VDD
pin.
The converter resolution is given by::
V DD – V SS
--------------------------256
The Input voltage (Ain) which is to be converted
must be constant for 1µs before conversion and
remain constant during conversion.
Conversion resolution can be improved if the power supply voltage (VDD) to the microcontroller is
lowered.
In order to optimise conversion resolution, the user
can configure the microcontroller in WAIT mode,
because this mode minimises noise disturbances
and power supply variations due to output switching. Nevertheless, the WAIT instruction should be
executed as soon as possible after the beginning
of the conversion, because execution of the WAIT
instruction may cause a small variation of the VDD
voltage. The negative effect of this variation is minimized at the beginning of the conversion when the
converter is less sensitive, rather than at the end
of conversion, when the less significant bits are
determined.
The best configuration, from an accuracy standpoint, is WAIT mode with the Timer stopped. Indeed, only the ADC peripheral and the oscillator
are then still working. The MCU must be woken up
from WAIT mode by the ADC interrupt at the end
of the conversion. It should be noted that waking
up the microcontroller could also be done using
the Timer interrupt, but in this case the Timer will
be working and the resulting noise could affect
conversion accuracy.
One extra feature is available in the ADC to get a
better accuracy. In fact, each ADC conversion has
to be followed by a WAIT instruction to minimize
52/79
the noise during the conversion. But the first conversion step is performed before the execution of
the WAIT when most of clocks signals are still enabled . The key is to synchronize the ADC start
with the effective execution of the WAIT. This is
achieved by setting ADC SYNC option. This way,
ADC conversion starts in effective WAIT for maximum accuracy.
Note: With this extra option, it is mandatory to execute WAIT instruction just after ADC start instruction. Insertion of any extra instruction may cause
spurious interrupt request at ADC interrupt vector.
A/D Converter Control Register (ADCR)
Address: 0D1h — Read/Write
7
EAI
0
EOC
STA
PDS
D3
D2
D1
D0
Bit 7 = EAI: Enable A/D Interrupt. If this bit is set to
“1” the A/D interrupt is enabled, when EAI=0 the
interrupt is disabled.
Bit 6 = EOC: End of conversion. Read Only. This
read only bit indicates when a conversion has
been completed. This bit is automatically reset to
“0” when the STA bit is written. If the user is using
the interrupt option then this bit can be used as an
interrupt pending bit. Data in the data conversion
register are valid only when this bit is set to “1”.
Bit 5 = STA: Start of Conversion. Write Only. Writing a “1” to this bit will start a conversion on the selected channel and automatically reset to “0” the
EOC bit. If the bit is set again when a conversion is
in progress, the present conversion is stopped and
a new one will take place. This bit is write only, any
attempt to read it will show a logical zero.
Bit 4 = PDS: Power Down Selection. This bit activates the A/D converter if set to “1”. Writing a “0” to
this bit will put the ADC in power down mode (idle
mode).
Bit 3-0 = D3-D0. Not used
A/D Converter Data Register (ADR)
Address: 0D0h — Read only
7
D7
0
D6
D5
D4
D3
D2
D1
Bit 7-0 = D7-D0: 8 Bit A/D Conversion Result.
D0
ST62T55CM-Auto ST62T65CM-Auto
4.5 SERIAL PERIPHERAL INTERFACE (SPI)
The SPI peripheral is an optimized synchronous
serial interface with programmable transmission
modes and master/slave capabilities supporting a
wide range of industry standard SPI specifications.
The SPI interface may also implement asynchronous data transfer, in which case processor overhead is limited to data transfer from or to the shift
register on an interrupt driven basis.
The SPI may be controlled by simple user software to perform serial data exchange with lowcost external memory, or with serially controlled
peripherals to drive displays, motors or relays.
The SPI’s shift register is simultaneously fed by
the Sin pin and feeds the Sout pin, thus transmission and reception are essentially the same process. Suitable setting of the number of bits in the
data frame can allow filtering of unwanted leading
data bits in the incoming data stream.
The SPI comprises an 8-bit Data/Shift Register,
DSR, a Divide register, DIV, a Mode Control Register MOD, and a Miscellaneous register, MISCR.
The SPI may be operated either in Master mode or
in Slave mode.
Master mode is defined by the synchronous serial
clock being supplied by the MCU, by suitably programming the clock divider (DIV register). Slave
mode is defined by the serial clock being supplied
externally on the SCK pin by the external Master
device.
For maximum versatility the SPI may be programmed to sample data either on the rising or on
the falling edge of SCK, with or without phase shift
(clock Polarity and Phase selection).
The Sin, Sout and SCK signals are connected as
alternate I/O pin functions.
For serial input operation, Sin must be configured
as an input. For serial output operation, Sout is selected as an output by programming Bit 0 of the
Miscellaneous Register: clearing this bit will set
the pin as a standard I/O line, while setting the bit
will select the Sout function.
An interrupt request may be associated with the
end of a transmission or reception cycle; this is defined by programming the number of bits in the
data frame and by enabling the interrupt. This request is associated with interrupt vector #2, and
can be masked by programming the SPIE bit of
the MOD register. Since the SPI interrupt is
“ORed” with the port interrupt source, an interrupt
flag bit is available in the DIV register allowing discrimination of the interrupt request.
Figure 30. SPI Block Diagram
CPU
CYCLE
CLOCK
SCK
SPI
DIVIDER
FILTER
CLOCK
Sin
FILTER
Sout
8
SHIFT
REGISTER
DATA BUS
VR001693
53/79
ST62T55CM-Auto ST62T65CM-Auto
SERIAL PERIPHERAL INTERFACE SPI (Cont’d)
4.5.1 SPI Registers
SPI Mode Control Register (MOD)
Address: E2h — Read/Write
Reset status: 00h
7
SPRUN SPIE
0
CPHA SPCLK
SPIN
SPSTRT
EFILT
CPOL
The MOD register defines and controls the transmission modes and characteristics.
This register is read/write and all bits are cleared
at reset. Setting SPSTRT = 1 and SPIN = 1 is not
allowed and must be avoided.
Bit 7 = SPRUN: SPI Run. This bit is the SPI activity
flag. This can be used in either transmit or receive
modes; it is automatically cleared by the SPI at the
end of a transmission or reception and generates
an interrupt request (providing that the SPIE Interrupt Enable bit is set). The Core can stop transmission or reception at any time by resetting the
SPRUN bit; this will also generate an interrupt request (providing that the SPIE Interrupt enable bit
is set). The SPRUN bit can be used as a start condition parameter, in conjunction with the SPSTRT
bit, when an external signal is present on the Sin
pin. Note that a rising edge is then necessary to initiate reception; this may require external data inversion. This bit can be used to poll the end of reception or transmission.
Bit 6 = SPIE: SPI Interrupt Enable. This bit is the
SPI Interrupt Enable bit. If this bit is set the SPI interrupt (vector #2) is enabled, when SPIE is reset,
the interrupt is disabled.
Bit 5 = CPHA: Clock Phase Selection. This bit selects the clock phase of the clock signal. If this bit
is cleared to zero the normal state is selected; in
this case Bit 7 of the data frame is present on Sout
pin as soon as the SPI Shift Register is loaded. If
this bit is set to one the shifted state' is selected; in
this case Bit 7 of data frame is present on Sout pin
on the first falling edge of Shift Register clock. The
polarity relation and the division ratio between
Shift Register and SPI base clock are also programmable; refer to DIV register and Timing Diagrams for more information.
Bit 4= SPCLK: Base Clock Selection
This bit selects the SPI base clock source. It is either the core cycle clock (fINT/13) (Master mode)
or the signal provided at SCK pin by an external
device (slave mode). If SPCLK is low and the SCK
54/79
pin is configured as input, the slave mode is selected. If SPCLK is high, the SCK pin is automaticcally configured as push pull output and the master mode is selected. In this case, the phase and
polarity of the clock are controlled by CPOL and
CPHA.
Note: When the master mode is enabled, it is
mandatory to configure PC4 in input mode through
the i/o port registers.
Bit 3 = SPIN: Input Selection
This bit enables the transfer of the data input to the
Shift Register in receive mode. If this bit is cleared
the Shift Register input is 0. If this bit is set, the
Shift Register input corresponds to the input signal
present on the Sin pin.
Bit 2 = SPSTRT: Start Selection
This bit selects the transmission or reception start
mode. If SPSTRT is cleared, the internal start condition occurs as soon as the SPRUN bit is set. If
SPSTRT is set, the internal start signal is the logic
“AND” between the SPRUN bit and the external
signal present on the Sin pin; in this case transmission will start after the latest of both signals providing that the first signal is still present (note that this
implies a rising edge). After the transmission or recetion has been started, it will continue even if the
Sin signal is reset.
Bit 1 = EFILT: Enable Filters
This bit enables/disables the input noise filters on
the Sin and SCK inputs. If it is cleared to zero the
filters are enabled, if set to one the filters are disabled. These noise filters will eliminate any pulse on
Sin and SCK with a pulse width smaller than one
to two Core clock periods (depending on the occurrence of the signal edge with respect to the
Core clock edge). For example, if the ST6260B/
65B runs with an 8MHz crystal, Sin and SCK will
be delayed by 125 to 250ns.
Bit 0 = CPOL: Clock Polarity
This bit controls the relationship between the data
on the Sin and Sout pins and SCK. The CPOL bit
selects the clock edge which captures data and allows it to change state. It has the greatest impact
on the first bit transmitted (the MSB) as it does (or
does not) allow a clock transition before the first
data capture edge.
Refer to the timing diagrams at the end of this section for additional details. These show the relationship between CPOL, CPHA and SCK, and indicate
the active clock edges and strobe times.
ST62T55CM-Auto ST62T65CM-Auto
SERIAL PERIPHERAL INTERFACE SPI (Cont’d)
SPI DIV Register (DIV)
Address: E1h — Read/Write
Reset status: 00h
7
SPINT
0
DOV6
DIV5
DIV4
DIV3
CD2
CD1
CD0
The SPIDIV register defines the transmission rate
and frame format and contains the interrupt flag.
Bits CD0-CD2, DIV3-DIV6 are read/write while
SPINT can be read and cleared only. Write access
is not allowed if SPRUN in the MOD register is set.
Bit 7 = SPINT: Interrupt Flag. If SPIE bit=1, SPINT
is automatically set to one by the SPI at the end of
a transmission or reception and an interrupt request can be generated depending on the state of
the interrupt mask bit in the MOD control register.
This bit is write and read and must be cleared by
user software at the end of the interrupt service
routine.
Bit 6-3 = DIV6-DIV3: Burst Mode Bit Clock Period
Selection. Define the number of shift register bits
that are transmitted or received in a frame. The
available selections are listed in Table 17. The
normal maximum setting is 8 bits, since the shift
register is 8 bits wide. Note that by setting a greater number of bits, in conjunction with the SPIN bit
in the MOD register, unwanted data bits may be filtered from the data stream.
Bit 2-0 = CD2-CD0: Base/Bit Clock Rate Selection. Define the division ratio between the core
clock (fINT divided by 13) and the clock supplied to
the Shift Register in Master mode.
Table 16. Base/Bit Clock Ratio Selection
0
CD2-CD0
0
0
Divide Ratio (decimal)
Divide by 1
0
0
1
Divide by 2
0
1
0
Divide by 4
0
1
1
Divide by 8
1
0
0
Divide by 16
1
0
1
Divide by 32
1
1
0
Divide by 64
1
1
1
Divide by 256
Note: For example, when an 8MHz CPU clock is
used, asynchronous operation at 9600 Baud is
possible (8MHz/13/64). Other Baud rates are
available by proportionally selecting division factors depending on CPU clock frequency.
Data setup time on Sin is typically 250ns min, while
data hold time is typically 50ns min.
0
DIV6-DIV3
0
0
0
Number of bits sent
Reserved (not to be used)
0
0
0
1
1
0
0
1
0
2
0
0
1
3
0
1
1
0
0
4
0
1
0
1
5
0
1
1
0
6
0
1
1
1
7
1
0
0
0
8
1
0
0
1
9
⎞
1
0
1
0
10
⎟
1
0
1
1
11
⎟
Refer to the
1
1
0
0
12
⎟
description of the
1
1
0
1
13
⎟
DIV6-DIV3 bits in
1
1
1
0
14
⎟
the DIV Register
1
1
1
1
15
⎠
SPI Data/Shift Register (SPIDSR)
Address: E0h — Read/Write
Reset status: XXh
7
D7
0
D6
D5
D4
D3
D2
D1
D0
SPIDSR is read/write, however write access is not
allowed if the SPRUN bit of Mode Control register
is set to one.
Data is sampled into SPDSR on the SCK edge determined by the CPOL and CPHA bits. The affect
of these setting is shown in the following diagrams.
The Shift Register transmits and receives the Most
Significant Bit first.
Bit 7-0 = DSR7-DSR0: Data Bits. These are the
SPI shift register data bits.
Miscellaneous Register (MISCR)
Address: DDh — Write only
Reset status: xxxxxxxb
7
-
0
-
-
-
-
-
-
D0
Bit 7-1 = D7-D1: Reserved.
Bit 0 = D0: Bit 0. This bit, when set, selects the
Sout pin as the SPI output line. When this bit is
cleared, Sout acts as a standard I/O line.
55/79
ST62T55CM-Auto ST62T65CM-Auto
SERIAL PERIPHERAL INTERFACE SPI (Cont’d)
4.6 SPI Timing Diagrams
Figure 31. CPOL = 0 Clock Polarity Normal, CPHA = 0 Phase Selection Normal
SPRUN
SCK
Sin
Sampling
Sout
b7
b6
b5
b4
b3
b2
b1
b0
VR001694
Figure 32. CPOL = 1 Clock Polarity Inverted, CPHA = 0 Phase Selection Normal
SPRUN
SCK
Sin
Sampling
Sout
b7
b6
b5
b4
b3
b2
b1
b0
VR0A1694
56/79
ST62T55CM-Auto ST62T65CM-Auto
SERIAL PERIPHERAL INTERFACE SPI (Cont’d)
Figure 33. CPOL = 0 Clock Polarity Normal, CPHA = 1 Phase Selection Shifted
SPRUN
SCK
Sin
Sampling
Sout
b7
b6
b5
b4
b3
b2
b1
b0
VR0B1694
Figure 34. CPOL = 1 Clock Polarity Inverted, CPHA = 1 Phase Selection Shifted
SPRUN
SCK
Sin
Sampling
Sout
b7
b6
b5
b4
b3
b2
b1
b0
VR0C1694
57/79
ST62T55CM-Auto ST62T65CM-Auto
5 SOFTWARE
5.1 ST6 ARCHITECTURE
The ST6 software has been designed to fully use
the hardware in the most efficient way possible
while keeping byte usage to a minimum; in short,
to provide byte efficient programming capability.
The ST6 core has the ability to set or clear any
register or RAM location bit of the Data space with
a single instruction. Furthermore, the program
may branch to a selected address depending on
the status of any bit of the Data space. The carry
bit is stored with the value of the bit when the SET
or RES instruction is processed.
5.2 ADDRESSING MODES
The ST6 core offers nine addressing modes,
which are described in the following paragraphs.
Three different address spaces are available: Program space, Data space, and Stack space. Program space contains the instructions which are to
be executed, plus the data for immediate mode instructions. Data space contains the Accumulator,
the X,Y,V and W registers, peripheral and Input/
Output registers, the RAM locations and Data
ROM locations (for storage of tables and constants). Stack space contains six 12-bit RAM cells
used to stack the return addresses for subroutines
and interrupts.
Immediate. In the immediate addressing mode,
the operand of the instruction follows the opcode
location. As the operand is a ROM byte, the immediate addressing mode is used to access constants which do not change during program execution (e.g., a constant used to initialize a loop counter).
Direct. In the direct addressing mode, the address
of the byte which is processed by the instruction is
stored in the location which follows the opcode. Direct addressing allows the user to directly address
the 256 bytes in Data Space memory with a single
two-byte instruction.
Short Direct. The core can address the four RAM
registers X,Y,V,W (locations 80h, 81h, 82h, 83h) in
the short-direct addressing mode. In this case, the
instruction is only one byte and the selection of the
location to be processed is contained in the opcode. Short direct addressing is a subset of the direct addressing mode. (Note that 80h and 81h are
also indirect registers).
Extended. In the extended addressing mode, the
12-bit address needed to define the instruction is
obtained by concatenating the four less significant
58/79
bits of the opcode with the byte following the opcode. The instructions (JP, CALL) which use the
extended addressing mode are able to branch to
any address of the 4K bytes Program space.
An extended addressing mode instruction is twobyte long.
Program Counter Relative. The relative addressing mode is only used in conditional branch instructions. The instruction is used to perform a test
and, if the condition is true, a branch with a span of
-15 to +16 locations around the address of the relative instruction. If the condition is not true, the instruction which follows the relative instruction is
executed. The relative addressing mode instruction is one-byte long. The opcode is obtained in
adding the three most significant bits which characterize the kind of the test, one bit which determines whether the branch is a forward (when it is
0) or backward (when it is 1) branch and the four
less significant bits which give the span of the
branch (0h to Fh) which must be added or subtracted to the address of the relative instruction to
obtain the address of the branch.
Bit Direct. In the bit direct addressing mode, the
bit to be set or cleared is part of the opcode, and
the byte following the opcode points to the address of the byte in which the specified bit must be
set or cleared. Thus, any bit in the 256 locations of
Data space memory can be set or cleared.
Bit Test & Branch. The bit test and branch addressing mode is a combination of direct addressing and relative addressing. The bit test and
branch instruction is three-byte long. The bit identification and the tested condition are included in
the opcode byte. The address of the byte to be
tested follows immediately the opcode in the Program space. The third byte is the jump displacement, which is in the range of -127 to +128. This
displacement can be determined using a label,
which is converted by the assembler.
Indirect. In the indirect addressing mode, the byte
processed by the register-indirect instruction is at
the address pointed by the content of one of the indirect registers, X or Y (80h,81h). The indirect register is selected by the bit 4 of the opcode. A register indirect instruction is one byte long.
Inherent. In the inherent addressing mode, all the
information necessary to execute the instruction is
contained in the opcode. These instructions are
one byte long.
ST62T55CM-Auto ST62T65CM-Auto
5.3 INSTRUCTION SET
The ST6 core offers a set of 40 basic instructions
which, when combined with nine addressing
modes, yield 244 usable opcodes. They can be divided into six different types: load/store, arithmetic/logic, conditional branch, control instructions,
jump/call, and bit manipulation. The following paragraphs describe the different types.
All the instructions belonging to a given type are
presented in individual tables.
Load & Store. These instructions use one, two or
three bytes in relation with the addressing mode.
One operand is the Accumulator for LOAD and the
other operand is obtained from data memory using
one of the addressing modes.
For Load Immediate one operand can be any of
the 256 data space bytes while the other is always
immediate data.
Table 18. Load & Store Instructions
Instruction
LD A, X
LD A, Y
LD A, V
LD A, W
LD X, A
LD Y, A
LD V, A
LD W, A
LD A, rr
LD rr, A
LD A, (X)
LD A, (Y)
LD (X), A
LD (Y), A
LDI A, #N
LDI rr, #N
Addressing Mode
Short Direct
Short Direct
Short Direct
Short Direct
Short Direct
Short Direct
Short Direct
Short Direct
Direct
Direct
Indirect
Indirect
Indirect
Indirect
Immediate
Immediate
Bytes
Cycles
1
1
1
1
1
1
1
1
2
2
1
1
1
1
2
3
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
Flags
Z
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
*
C
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Notes:
X,Y. Indirect Register Pointers, V & W Short Direct Registers
# . Immediate data (stored in ROM memory)
rr. Data space register
∆. Affected
* . Not Affected
59/79
ST62T55CM-Auto ST62T65CM-Auto
INSTRUCTION SET (Cont’d)
Arithmetic and Logic. These instructions are
used to perform the arithmetic calculations and
logic operations. In AND, ADD, CP, SUB instructions one operand is always the accumulator while
the other can be either a data space memory con-
tent or an immediate value in relation with the addressing mode. In CLR, DEC, INC instructions the
operand can be any of the 256 data space addresses. In COM, RLC, SLA the operand is always
the accumulator.
Table 19. Arithmetic & Logic Instructions
Instruction
ADD A, (X)
ADD A, (Y)
ADD A, rr
ADDI A, #N
AND A, (X)
AND A, (Y)
AND A, rr
ANDI A, #N
CLR A
CLR r
COM A
CP A, (X)
CP A, (Y)
CP A, rr
CPI A, #N
DEC X
DEC Y
DEC V
DEC W
DEC A
DEC rr
DEC (X)
DEC (Y)
INC X
INC Y
INC V
INC W
INC A
INC rr
INC (X)
INC (Y)
RLC A
SLA A
SUB A, (X)
SUB A, (Y)
SUB A, rr
SUBI A, #N
Addressing Mode
Indirect
Indirect
Direct
Immediate
Indirect
Indirect
Direct
Immediate
Short Direct
Direct
Inherent
Indirect
Indirect
Direct
Immediate
Short Direct
Short Direct
Short Direct
Short Direct
Direct
Direct
Indirect
Indirect
Short Direct
Short Direct
Short Direct
Short Direct
Direct
Direct
Indirect
Indirect
Inherent
Inherent
Indirect
Indirect
Direct
Immediate
Bytes
Cycles
1
1
2
2
1
1
2
2
2
3
1
1
1
2
2
1
1
1
1
2
2
1
1
1
1
1
1
2
2
1
1
1
2
1
1
2
2
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
Notes:
X,Y.Indirect Register Pointers, V & W Short Direct RegistersD. Affected
# . Immediate data (stored in ROM memory)* . Not Affected
rr. Data space register
60/79
Flags
Z
∆
∆
∆
∆
∆
∆
∆
∆
∆
*
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
C
∆
∆
∆
∆
∆
∆
∆
∆
∆
*
∆
∆
∆
∆
∆
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
∆
∆
∆
∆
∆
∆
ST62T55CM-Auto ST62T65CM-Auto
INSTRUCTION SET (Cont’d)
Conditional Branch. The branch instructions
achieve a branch in the program when the selected condition is met.
Control Instructions. The control instructions
control the MCU operations during program execution.
Bit Manipulation Instructions. These instructions can handle any bit in data space memory.
One group either sets or clears. The other group
(see Conditional Branch) performs the bit test
branch operations.
Jump and Call. These two instructions are used
to perform long (12-bit) jumps or subroutines call
inside the whole program space.
Table 20. Conditional Branch Instructions
Instruction
JRC e
JRNC e
JRZ e
JRNZ e
JRR b, rr, ee
JRS b, rr, ee
Branch If
C=1
C=0
Z=1
Z=0
Bit = 0
Bit = 1
Bytes
Cycles
1
1
1
1
3
3
2
2
2
2
5
5
Notes:
b.
3-bit address
e.
5 bit signed displacement in the range -15 to +16<F128M>
ee. 8 bit signed displacement in the range -126 to +129
Flags
Z
*
*
*
*
*
*
C
*
*
*
*
∆
∆
rr. Data space register
∆ . Affected. The tested bit is shifted into carry.
* . Not Affected
Table 21. Bit Manipulation Instructions
Instruction
SET b,rr
RES b,rr
Addressing Mode
Bit Direct
Bit Direct
Bytes
Cycles
2
2
4
4
Notes:
b.
3-bit address;
rr. Data space register;
Flags
Z
*
*
C
*
*
* . Not<M> Affected
Table 22. Control Instructions
Instruction
NOP
RET
RETI
STOP (1)
WAIT
Addressing Mode
Inherent
Inherent
Inherent
Inherent
Inherent
Bytes
Cycles
1
1
1
1
1
2
2
2
2
2
Flags
Z
*
*
∆
*
*
C
*
*
∆
*
*
Notes:
1.
This instruction is deactivated<N>and a WAIT is automatically executed instead of a STOP if the watchdog function is selected.
∆ . Affected
*.
Not Affected
Table 23. Jump & Call Instructions
Instruction
CALL abc
JP abc
Addressing Mode
Extended
Extended
Bytes
Cycles
2
2
4
4
Flags
Z
C
*
*
*
*
Notes:
abc. 12-bit address;
* . Not Affected
61/79
ST62T55CM-Auto ST62T65CM-Auto
Opcode Map Summary. The following table contains an opcode map for the instructions used by the ST6
LOW
0
0000
HI
0
0000
1
0001
2
0010
3
0011
4
0100
5
0101
6
0110
7
0111
8
1000
9
1001
A
1010
B
1011
C
1100
D
1101
E
1110
F
1111
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
RNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
1
0001
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
CALL
abc
ext
CALL
abc
ext
CALL
abc
ext
CALL
abc
ext
CALL
abc
ext
CALL
abc
ext
CALL
abc
ext
CALL
abc
ext
CALL
abc
ext
CALL
abc
ext
CALL
abc
ext
CALL
abc
ext
CALL
abc
ext
CALL
abc
ext
CALL
abc
ext
CALL
abc
ext
Abbreviations for Addressing Modes:
dir
Direct
sd
Short Direct
imm Immediate
inh
Inherent
ext
Extended
b.d
Bit Direct
bt
Bit Test
pcr
Program Counter Relative
ind
Indirect
62/79
2
0010
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
3
0011
5
3
5
3
5
3
5
3
5
3
5
3
5
3
5
3
5
3
5
3
5
3
5
3
5
3
5
3
5
3
5
3
JRR
b0,rr,ee
bt
JRS
b0,rr,ee
bt
JRR
b4,rr,ee
bt
JRS
b4,rr,ee
bt
JRR
b2,rr,ee
bt
JRS
b2,rr,ee
bt
JRR
b6,rr,ee
bt
JRS
b6,rr,ee
bt
JRR
b1,rr,ee
bt
JRS
b1,rr,ee
bt
JRR
b5,rr,ee
bt
JRS
b5,rr,ee
bt
JRR
b3,rr,ee
bt
JRS
b3,rr,ee
bt
JRR
b7,rr,ee
bt
JRS
b7,rr,ee
bt
4
0100
2
5
0101
6
0110
JRZ
2
e
1
2
#
pcr
JRZ 4
e
1
2
e
x
e
sd 1
2
#
sd 1
2
#
pcr
JRZ 4
e
1
2
e
y
e
1
2
sd 1
2
#
e
sd 1
2
#
pcr
JRZ 4
e
1
2
1
2
sd 1
2
e
1
2
a,v
e
sd 1
2
#
pcr
JRZ 4
e
1
2
e
w
e
1
Legend:
#
Indicates Illegal Instructions
e
5 Bit Displacement
b
3 Bit Address
rr
1byte dataspace address
nn
1 byte immediate data
abc 12 bit address
ee
8 bit Displacement
prc 1
JRC 4
e
sd 1
2
#
pcr
JRZ 4
e
prc 2
JRC 4
1
INC 2
pcr 1
JRZ
1
2
prc 1
JRC 4
e
pcr 1
JRZ
1
2
prc
JRC 4
1
LD 2
prc 2
JRC 4
e
1
LD 2
a,w
pcr 1
prc 1
JRC
e
sd 1
Cycle
Addressing Mode
AND
a,(x)
ind
ANDI
a,nn
imm
SUB
a,(x)
ind
SUBI
a,nn
imm
DEC
(x)
ind
#
prc
2
Operand
Bytes
ind
#
e
pcr
JRZ 4
LD
prc 1
JRC
JRC
e
1
prc
0
0000
1
0001
2
0010
3
0011
4
0100
5
0101
6
0110
7
0111
(x),a
e
#
a,nn
imm
CP
a,(x)
ind
CPI
a,nn
imm
ADD
a,(x)
ind
ADDI
a,nn
imm
INC
(x)
ind
prc
JRC 4
1
INC 2
pcr 1
JRZ
ind
LDI
#
e
v
e
prc 1
JRC
e
pcr 1
JRZ
1
2
prc 2
JRC 4
1
LD 2
a,y
e
prc 1
JRC 4
e
pcr
JRZ 4
e
prc 2
JRC 4
1
INC 2
pcr 1
JRZ
1
2
prc 1
JRC 4
e
pcr 1
JRZ
e
prc 2
JRC 4
1
LD 2
a,x
1
2
a,(x)
e
pcr
JRZ 4
HI
LD
prc 1
JRC 4
e
pcr 1
JRZ
1
2
e
1
2
JRC 4
1
INC 2
LOW
7
0111
8
1000
9
1001
A
1010
B
1011
C
1100
D
1101
E
1110
F
1111
Mnemonic
ST62T55CM-Auto ST62T65CM-Auto
Opcode Map Summary (Continued)
LOW
8
1000
HI
0
0000
1
0001
2
0010
3
0011
4
0100
5
0101
6
0110
7
0111
8
1000
9
1001
A
1010
B
1011
C
1100
D
1101
E
1110
F
1111
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
RNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
JRNZ
e
pcr
9
1001
4
A
1010
JP 2
abc
2
4
ext 1
JP 2
abc
2
4
ext 1
JP 2
abc
2
4
ext 1
JP 2
abc
2
4
ext 1
JP 2
abc
2
4
ext 1
JP 2
abc
2
4
ext 1
JP 2
abc
2
4
ext 1
JP 2
abc
2
4
ext 1
JP 2
abc
2
4
ext 1
JP 2
abc
2
4
ext 1
JP 2
abc
2
4
ext 1
JP 2
abc
2
4
ext 1
JP 2
abc
2
4
ext 1
JP 2
abc
2
4
ext 1
JP 2
abc
2
4
ext 1
JP 2
abc
2
ext 1
Abbreviations for Addressing Modes:
dir
Direct
sd
Short Direct
imm Immediate
inh
Inherent
ext
Extended
b.d
Bit Direct
bt
Bit Test
pcr
Program Counter Relative
ind
Indirect
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
JRNC
e
pcr
B
1011
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
4
2
RES
b0,rr
b.d
SET
b0,rr
b.d
RES
b4,rr
b.d
SET
b4,rr
b.d
RES
b2,rr
b.d
SET
b2,rr
b.d
RES
b6,rr
b.d
SET
b6,rr
b.d
RES
b1,rr
b.d
SET
b1,rr
b.d
RES
b5,rr
b.d
SET
b5,rr
b.d
RES
b3,rr
b.d
SET
b3,rr
b.d
RES
b7,rr
b.d
SET
b7,rr
b.d
C
1100
2
D
1101
JRZ 4
e
1
2
pcr 3
JRZ 4
e
1
2
pcr 1
JRZ 4
e
1
2
e
1
2
E
1110
LDI 2
rr,nn
imm
DEC
x
sd
COM
a
pcr
JRZ 4
e
1
2
pcr 1
JRZ 2
sd 1
RETI 2
pcr 1
JRZ 4
inh 1
DEC 2
y
pcr 1
JRZ 2
sd 1
STOP 2
pcr 1
JRZ 4
inh 1
LD 2
1
2
y,a
e
#
e
v
e
pcr 1
JRZ 2
sd 1
RET 2
pcr 1
JRZ 4
inh 1
DEC 2
Legend:
#
Indicates Illegal Instructions
e
5 Bit Displacement
b
3 Bit Address
rr
1byte dataspace address
nn
1 byte immediate data
abc 12 bit address
ee
8 bit Displacement
prc 2
JRC 4
e
w
prc 1
JRC 4
e
pcr 1
JRZ 2
sd 1
WAIT 2
pcr 1
JRZ 4
inh 1
LD 2
prc 2
JRC 4
e
e
1
prc 1
JRC 4
e
e
1
2
prc 2
JRC 4
e
v,a
e
1
2
prc 1
JRC 4
inh 1
LD 2
e
1
2
prc 2
JRC 4
sd 1
RCL 2
a
e
prc 1
JRC 4
e
pcr 1
JRZ 4
1
2
prc 2
JRC 4
1
DEC 2
pcr 1
JRZ 4
1
2
prc 1
JRC 4
e
pcr
JRZ 4
1
2
prc 2
JRC 4
sd 1
2
w,a
pcr 1
prc 1
JRC 4
e
sd 1
Cycle
prc 2
2
Operand
Bytes
ind
CP
a,rr
e
pcr 1
JRZ
1
2
a,(y)
e
e
dir
CP
prc 1
JRC 4
e
e
1
2
e
e
e
ind
LD
a,rr
e
e
1
2
a,(y)
prc 2
JRC 4
1
LD 2
HI
LD
prc 1
JRC 4
e
x,a
1
2
JRC 4
1
2
LOW
F
1111
dir
ADD
a,(y)
ind
ADD
a,rr
dir
INC
(y)
ind
INC
rr
dir
LD
(y),a
ind
LD
rr,a
dir
AND
a,(y)
ind
AND
a,rr
dir
SUB
a,(y)
ind
SUB
a,rr
dir
DEC
(y)
ind
DEC
rr
dir
JRC
0
0000
1
0001
2
0010
3
0011
4
0100
5
0101
6
0110
7
0111
8
1000
9
1001
A
1010
B
1011
C
1100
D
1101
E
1110
F
1111
Mnemonic
e
1
prc
Addressing Mode
63/79
ST62T55CM-Auto ST62T65CM-Auto
6 ELECTRICAL CHARACTERISTICS
6.1 ABSOLUTE MAXIMUM RATINGS
This product contains devices to protect the inputs
against damage due to high static voltages, however it is advisable to take normal precaution to
avoid application of any voltage higher than the
specified maximum rated voltages.
For proper operation it is recommended that VI
and VO be higher than VSS and lower than VDD.
Reliability is enhanced if unused inputs are connected to an appropriate logic voltage level (VDD
or VSS).
Symbol
VDD
Parameter
Supply Voltage
Power Considerations.The average chip-junction temperature, Tj, in Celsius can be obtained
from:
Tj=TA + PD x RthJA
Where:TA = Ambient Temperature.
RthJA =Package thermal resistance (junction-to ambient).
PD = Pint + Pport.
Pint =IDD x VDD (chip internal power).
Pport =Port power dissipation (determined
by the user).
Value
Unit
-0.3 to 7.0
V
(1)
V
VI
Input Voltage
VSS - 0.3 to VDD + 0.3
VO
Output Voltage
VSS - 0.3 to VDD + 0.3(1)
V
IVDD
Total Current into VDD (source)
80
mA
IVSS
Total Current out of VSS (sink)
100
mA
Tj
Junction Temperature
150
°C
TSTG
Storage Temperature
-60 to 150
°C
Notes:
- Stresses above those listed as “absolute maximum ratings” may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at these conditions is not implied. Exposure to maximum rating conditions for extended periods may
affect device reliability.
- (1) Within these limits, clamping diodes are guarantee to be not conductive. Voltages outside these limits are authorised as long as injection
current is kept within the specification.
64/79
ST62T55CM-Auto ST62T65CM-Auto
6.2 RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Test Conditions
Value
Min.
Max.
Unit
-40
0
-40
85
70
125
°C
fOSC = 4MHz, 1 & 6 Suffix
Operating Supply Voltage
fOSC = 4MHz, 3 Suffix
(Except ST626xB ROM devices) fosc= 8MHz , 1 & 6 Suffix
fosc= 8MHz , 3 Suffix
3.0
3.0
3.6
4.5
6.0
6.0
6.0
6.0
V
fOSC = 4MHz, 1 & 6 Suffix
fOSC = 4MHz, 3 Suffix
fosc= 8MHz , 1 & 6 Suffix
fosc= 8MHz , 3 Suffix
3.0
3.0
4.0
4.5
6.0
6.0
6.0
6.0
V
VDD = 3.0V, 1 & 6 Suffix
Oscillator Frequency2)
VDD = 3.0V , 3 Suffix
(Except ST626xB ROM devices) VDD = 3.6V , 1 & 6 Suffix
VDD = 3.6V , 3 Suffix
0
0
0
0
4.0
4.0
8.0
4.0
MHz
Oscillator Frequency2)
(ST626xB ROM devices)
VDD = 3.0V, 1 & 6 Suffix
VDD = 3.0V , 3 Suffix
VDD = 4.0V , 1 & 6 Suffix
VDD = 4.0V , 3 Suffix
0
0
0
0
4.0
4.0
8.0
4.0
MHz
IINJ+
Pin Injection Current (positive)
VDD = 4.5 to 5.5V
+5
mA
IINJ-
Pin Injection Current (negative)
VDD = 4.5 to 5.5V
-5
mA
TA
VDD
6 Suffix Version
1 Suffix Version
3 Suffix Version
Typ.
Operating Temperature
Operating Supply Voltage
(ST626xB ROM devices)
fOSC
Notes:
1. Care must be taken in case of negative current injection, where adapted impedance must be respected on analog sources to not affect the
A/D conversion. For a -1mA injection, a maximum 10 KΩ is recommended.
2.An oscillator frequency above 1MHz is recommended for reliable A/D results
Figure 35. Maximum Operating FREQUENCY (Fmax) Versus SUPPLY VOLTAGE (VDD)
Maximum FREQUENCY (MHz)
1 & 6 Suffix version
8
FUNCTIONALITY IS NOT
1 & 6 Suffix
GUARANTEED IN
version
THIS AREA
7
3 Suffix version
6
5
4
3 Suffix version
3
2
1
2.5
3
3.6
4
4.5
5
5.5
6
SUPPLY VOLTAGE (VDD)
All devices except ST626xB ROM devices
ST626xB ROM devices
The shaded area is outside the recommended operating range; device functionality is not guaranteed under these conditions.
65/79
ST62T55CM-Auto ST62T65CM-Auto
6.3 DC ELECTRICAL CHARACTERISTICS
(TA = -40 to +125°C unless otherwise specified)
Symbol
VIL
VIH
VHys
Parameter
Test Conditions
Input Low Level Voltage
All Input pins
Input High Level Voltage
All Input pins
Hysteresis Voltage (1)
All Input pins
Vup
Vdn
66/79
Typ.
Max.
VDD x 0.3
VDD= 5V
VDD= 3V
LVD Threshold in power-on
LVD threshold in powerdown
Low Level Output Voltage
VDD= 5.0V; IOL = +10µA
All Output pins
VDD= 5.0V; IOL = + 3mA
VOL
VDD= 5.0V; IOL = +10µA
Low Level Output Voltage
VDD= 5.0V; IOL = +7mA
30 mA Sink I/O pins
VDD= 5.0V; IOL = +15mA
High Level Output Voltage VDD= 5.0V; IOH = -10µA
VOH
All Output pins
VDD= 5.0V; IOH = -3.0mA
All Input pins
RPU
Pull-up Resistance
RESET pin
Input Leakage Current
VIN = VSS (No Pull-Up configured)
All Input pins but RESET
VIN = VDD
IIL
IIH
Input Leakage Current
VIN = VSS
RESET pin
VIN = VDD
Supply Current in RESET
VRESET=VSS
Mode
fOSC=8MHz
Supply Current in
VDD=5.0V fINT=8MHz
RUN Mode (2)
Supply Current in WAIT
IDD
VDD=5.0V fINT=8MHz
Mode (3)
Supply Current in STOP
ILOAD=0mA
Mode, with LVD disabled(3) VDD=5.0V
Supply Current in STOP
ILOAD=0mA
Mode, with LVD enabled(3) VDD=5.0V
Retention EPROM Data Retention
TA = 55°C
Notes:
(1) Hysteresis voltage between switching levels
(2) All peripherals running
(3) All peripherals in stand-by
Value
Min.
Unit
V
VDD x 0.7
V
0.2
0.2
V
3.5
4.1
3.8
4.3
0.1
0.8
0.1
0.8
1.3
4.9
3.5
40
150
-8
V
V
100
350
350
900
0.1
1.0
-16
-30
10
ΚΩ
µA
7
mA
7
mA
2.5
mA
20
µA
500
10
years
ST62T55CM-Auto ST62T65CM-Auto
DC ELECTRICAL CHARACTERISTICS (Cont’d)
(TA = -40 to +85°C unless otherwise specified))
Symbol
Parameter
Vup
Vdn
LVD Threshold in power-on
LVD threshold in powerdown
Low Level Output Voltage
All Output pins
VOL
Low Level Output Voltage
30 mA Sink I/O pins
VOH
IDD
High Level Output Voltage
All Output pins
Supply Current in STOP
Mode, with LVD disabled(*)
Test Conditions
VDD= 5.0V; IOL = +10µA
VDD= 5.0V; IOL = + 5mA
VDD= 5.0V; IOL = + 10mAv
VDD= 5.0V; IOL = +10µA
VDD= 5.0V; IOL = +10mA
VDD= 5.0V; IOL = +20mA
VDD= 5.0V; IOL = +30mA
VDD= 5.0V; IOH = -10µA
VDD= 5.0V; IOH = -5.0mA
ILOAD=0mA
VDD=5.0V
Value
Unit
Min.
Typ.
Max.
Vdn +50 mV
3.6
4.1
3.8
4.3
Vup -50 mV
0.1
0.8
1.2
0.1
0.8
1.3
2.0
4.9
3.5
V
V
V
V
µA
10
Note:
(*) All Peripherals in stand-by.
6.4 AC ELECTRICAL CHARACTERISTICS
(TA = -40 to +125°C unless otherwise specified)
Symbol
tREC
TWEE
Endurance
(2)
Retention
fLFAO
fOSG
Parameter
Test Conditions
Supply Recovery Time (1)
EEPROM Write Time
EEPROM WRITE/ERASE Cycle
QA LOT Acceptance (25°C)
EEPROM Data Retention
TA = 55°C
Internal frequency with LFAO active
CIN
COUT
Max.
5
10
20
10
20
30
Internal frequency with RC oscillaVDD=5.0V (626xB ROM)
tor and OSG disabled2) 3)
R=10kΩ
R=27kΩ
R=67kΩ
R=100kΩ
ms
cycles
10
200
Unit
ms
300,000 1 million
VDD = 3V
VDD = 3.6V
VDD = 4.5V
VDD = 6V
VDD=5.0V (Except 626xB ROM)
R=47kΩ
R=100kΩ
R=470kΩ
fRC
Typ.
100
TA = 25°C
TA = 85°C
TA = 125°C
Internal Frequency with OSG
enabled2)
Value
Min.
years
400
1
1
2
2
800
kHz
fOSC
MHz
4
2.7
800
5
3.2
850
5.8
3.5
900
MHz
MHz
kHz
6.3
4.7
2.8
2.2
8.2
5.9
3.6
2.8
9.8
7
4.3
3.4
MHz
MHz
MHz
MHz
Input Capacitance
All Inputs Pins
10
pF
Output Capacitance
All Outputs Pins
10
pF
Notes:
1. Period for which VDD has to be connected at 0V to allow internal Reset function at next power-up.
2 An oscillator frequency above 1MHz is recommended for reliable A/D results.
3. Measure performed with OSCin pin soldered on PCB, with an around 2pF equivalent capacitance.
67/79
ST62T55CM-Auto ST62T65CM-Auto
6.5 A/D CONVERTER CHARACTERISTICS
(TA = -40 to +125°C unless otherwise specified)
Symbol
Parameter
Res
Test Conditions
Value
Typ.
8
Min.
Resolution
Total Accuracy (1) (2)
ATOT
tC
Conversion Time
ZIR
Zero Input Reading
FSR
Full Scale Reading
fOSC > 1.2MHz
fOSC > 32kHz
fOSC = 8MHz (TA < 85°C)
fOSC = 4 MHz
Conversion result when
VIN = VSS
Conversion result when
VIN = VDD
ACIN
Bit
±2
±4
LSB
70
140
µs
00
Hex
Analog Input Current During
VDD= 4.5V
Conversion
Analog Input Capacitance
ADI
Unit
Max.
2
FF
Hex
1.0
µA
5
pF
Notes:
1. Noise at VDD, VSS <10mV
2. With oscillator frequencies less than 1MHz, the A/D Converter accuracy is decreased.
6.6 TIMER CHARACTERISTICS
(TA = -40 to +125°C unless otherwise specified)
Symbol
Parameter
fIN
Input Frequency on TIMER Pin
tW
Pulse Width at TIMER Pin
Test Conditions
Value
Typ.
Min.
Max.
f INT
---------4
VDD = 3.0V
VDD >4.5V
Unit
MHz
µs
ns
1
125
6.7 SPI CHARACTERISTICS
(TA = -40 to +125°C unless otherwise specified)
Symbol
Parameter
Test Conditions
FCL
tSU
th
Clock Frequency
Set-up Time
Hold Time
Applied on Scl
Applied on Sin
Applied onSin
Min.
Value
Typ.
Max.
500
250
50
6.8 ARTIMER ELECTRICAL CHARACTERISTICS
(TA = -40 to +125°C unless otherwise specified)
Symbol
fIN
Parameter
Input Frequency on ARTIMin Pin
Test Conditions
Max
RUN and WAIT Modes
STOP mode
68/79
Min
Value
Typ
Unit
MHz
2
Unit
kHz
ns
ns
ST62T55CM-Auto ST62T65CM-Auto
Figure 36. Vol versus Iol on all I/O port at Vdd=5V
This curves represents typical variations and is given for guidance only
Figure 37. Vol versus Iol on all I/O port at T=25°C
This curves represents typical variations and is given for guidance only
Figure 38. Vol versus Iol for High sink (30mA) I/Oports at T=25°C
This curves represents typical variations and is given for guidance only
69/79
ST62T55CM-Auto ST62T65CM-Auto
Figure 39. Vol versus Iol for High sink (30mA) I/O ports at Vdd=5V
This curves represents typical variations and is given for guidance only
Figure 40. Voh versus Ioh on all I/O port at 25°C
This curves represents typical variations and is given for guidance only
Figure 41. Voh versus Ioh on all I/O port at Vdd=5V
This curves represents typical variations and is given for guidance only
70/79
ST62T55CM-Auto ST62T65CM-Auto
Figure 42. Idd WAIT versus VDD at 8 Mhz for OTP devices
This curves represents typical variations and is given for guidance only
Figure 43. Idd STOP versus VDD for OTP devices
This curves represents typical variations and is given for guidance only
Figure 44. Idd STOP versus VDD for ROM devices
This curves represents typical variations and is given for guidance only
71/79
ST62T55CM-Auto ST62T65CM-Auto
Figure 45. Idd WAIT versus VDD at 8Mhz for ROM devices
This curves represents typical variations and is given for guidance only
Figure 46. Idd RUN versus VDD at 8 Mhz for ROM and OTP devices
This curves represents typical variations and is given for guidance only
Figure 47. LVD thresholds versus temperature
This curves represents typical variations and is given for guidance only
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ST62T55CM-Auto ST62T65CM-Auto
Figure 48. RC frequency versus VDD for ROM ST626xB only
This curves represents typical variations and is given for guidance only
Figure 49. RC frequency versus VDD (Except for ST626xB ROM devices)
This curves represents typical variations and is given for guidance only
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ST62T55CM-Auto ST62T65CM-Auto
7 GENERAL INFORMATION
7.1 PACKAGE MECHANICAL DATA
Figure 50. 28-Pin Plastic Small Outline Package, 300-mil Width
Dim.
D
mm
Min
Typ
inches
Max
Min
Typ
Max
h x 45×
L
A1
A
C
a
B
e
A
2.35
2.65 0.093
0.104
A1
0.10
0.30 0.004
0.012
B
0.33
0.51 0.013
0.020
C
0.23
0.32 0.009
0.013
D
17.70
18.10 0.697
0.713
E
7.40
7.60 0.291
0.299
e
E H
1.27
0.050
H
10.00
10.65 0.394
0.419
h
0.25
0.75 0.010
0.030
α
0°
L
0.40
8°
0°
8°
1.27 0.016
0.050
Number of Pins
N
28
Figure 51. 28-Ceramic Dual In Line Package, 600-mil Width
Dim.
mm
Min
inches
Typ Max
A
Min
Typ Max
4.17
0.164
A1
0.76
0.030
B
0.36 0.46 0.56 0.014 0.018 0.022
B1
0.76 1.27 1.78 0.030 0.050 0.070
C
0.20 0.25 0.38 0.008 0.010 0.015
D
34.95 35.56 36.17 1.376 1.400 1.424
D1
33.02
1.300
E1 14.61 15.11 15.62 0.575 0.595 0.615
e
G
2.54
0.100
12.70 12.95 13.21 0.500 0.510 0.520
G1 12.70 12.95 13.21 0.500 0.510 0.520
G2
CDIP28W
L
1.14
2.92
0.045
5.08 0.115
0.200
S
1.27
0.050
Ø
8.89
0.350
Number of Pins
N
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28
ST62T55CM-Auto ST62T65CM-Auto
7.2 SOLDERING INFORMATION
In accordance with the RoHS European directive,
all STMicroelectronics packages have been converted to lead-free technology, named ECOPACK® .
® packages are qualified according
■ ECOPACK
to the JEDEC STD-020B compliant soldering
profile.
■ Detailed information on the STMicroelectronics
ECOPACK® transition program is available on
www.st.com/stonline/leadfree/, with specific
technical application notes covering the main
technical aspects related to lead-free
conversion (AN2033, AN2034, AN2035,
AN2036).
Forward compatibility
ECOPACK® LQFP packages are fully compatible
with lead (Pb) containing soldering process (see
application note AN2034).
Table 24. Soldering Compatibility (Wave and Reflow Soldering Process)
Package
SO28
Plating Material Devices
NiPdAu
Pb Solder Paste
Yes
Pb-free Solder Paste
Yes
7.3 OTP/EPROM VERSION ORDERING INFORMATION
Table 25. OTP/EPROM VERSION ORDERING INFORMATION
Sales Type
ST62E65CF1
ProgramMemory (Bytes)
3884 (EPROM)
EEPROM (Bytes)
128
ST62T55CMA
ST62T55CMC
3884 (OTP)
None
ST62T65CMA
ST62T65CMC
3884 (OTP)
128
Temperature Range
0 to +70°C
-40 to + 85°C
-40 to + 125°C
-40 to + 85°C
-40 to + 125°C
Package
CDIP201)
PSO28
PSO28
Notes:
1. Please contact local sales office for ordering information
7.4 IMPORTANT NOTE
For OTP devices, data retention and programmability must be guaranteed by a screening procedure. Refer to Application Note AN886.
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ST62T55CM-Auto ST62T65CM-Auto
7.5 FASTROM VERSION GENERAL
DESCRIPTION
The ST62P55C and ST62P65C are the Factory
Advanced Service Technique ROM (FASTROM)
versions of ST62T55C and ST62T65C OTP devices.
They offer the same functionality as OTP devices,
selecting as FASTROM options the options defined in the programmable option byte of the OTP
version.
7.6 FASTROM VERSION ORDERING
INFORMATION
The following section deals with the procedure for
transfer of customer codes to STMicroelectronics.
7.6.1 Transfer of Customer Code
Customer code is made up of the ROM contents
and the list of the selected FASTROM options.
The ROM contents are to be sent on diskette, or
by electronic means, with the hexadecimal file
generated by the development tool. All unused
bytes must be set to FFh.
The selected options are communicated to STMicroelectronics using the correctly filled OPTION
LIST appended. See page 77.
7.6.2 Listing Generation and Verification
When STMicroelectronics receives the user’s
ROM contents, a computer listing is generated
from it. This listing refers exactly to the ROM contents and options which will be used to produce
the specified MCU. The listing is then returned to
the customer who must thoroughly check, complete, sign and return it to STMicroelectronics. The
signed listing forms a part of the contractual agreement for the production of the specific customer
MCU.
The STMicroelectronics Sales Organization will be
pleased to provide detailed information on contractual points.
Table 26. ROM Memory Map ST62P55C/P65C
Device Address
Description
0000h-007Fh
0080h-0F9Fh
0FA0h-0FEFh
0FF0h-0FF7h
0FF8h-0FFBh
0FFCh-0FFDh
0FFEh-0FFFh
Reserved
User ROM
Reserved
Interrupt Vectors
Reserved
NMI Interrupt Vector
Reset Vector
Table 27. FASTROM version Ordering Information
Sales Type
ST62P55CMA/XXX
ST62P55CMC/XXX (*)
ST62P65CMA/XXX
ST62P65CMC/XXX (*)
ROM
EEPROM (Bytes)
None
3884 Bytes
128
Temperature Range
-40 to + 85°C
-40 to + 125°C
-40 to + 85°C
-40 to + 125°C
Package
PSO28
(*) Advanced information
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ST62T55CM-Auto ST62T65CM-Auto
ST62P55CM/P65CM MICROCONTROLLER OPTION LIST
Customer:
Address:
Contact:
Phone:
Reference:
..........................................................................
..........................................................................
..........................................................................
..........................................................................
..........................................................................
..........................................................................
STMicroelectronics references:
Device:
[ ] ST62P55CM (4 KB)
Package:
[ ] Dual in Line Plastic
[ ] Small Outline Plastic with conditioning
[ ] Shrink Small Outline Plastic with conditioning
[ ] Standard (Tube)
[ ] Tape & Reel
[ ] - 40°C to + 85°C
[ ] - 40°C to + 125°C
Conditioning option:
Temperature Range:
[ ] ST62P65CM (4 KB)
Marking:
[ ] Standard marking
[ ] Special marking (ROM only):
PSO28 (8 char. max): _ _ _ _ _ _ _ _
Authorized characters are letters, digits, '.', '-', '/' and spaces only.
Oscillator Safeguard*:
Oscillator Selection:
Reset Delay
Watchdog Selection:
PB1:PB0 pull-up at RESET*:
PB3:PB2 pull-up at RESET*:
External STOP Mode Control:
[ ] Enabled
[ ] Disabled
[ ] Quartz crystal / Ceramic resonator
[ ] RC network
[ ] 32768 cycle delay
[ ] 2048 cycle delay
[ ] Software Activation
[ ] Hardware Activation
[ ] Enabled
[ ] Disabled
[ ] Enabled
[ ] Disabled
[ ] Enabled
[ ] Disabled
Readout Protection:
Low Voltage Detector*:
NMI pull-up*:
ADC Synchro*:
[ ] Enabled
[ ] Enabled
[ ] Enabled
[ ] Enabled
[ ] Disabled
[ ] Disabled
[ ] Disabled
[ ] Disabled
Comments:
Oscillator Frequency in the application:
...........................................
Supply Operating Range in the application:
...........................................
Notes:
..........................................................................
Date:
..........................................................................
Signature:
..........................................................................
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ST62T55CM-Auto ST62T65CM-Auto
8 SUMMARY OF CHANGES
Date
Revision
13-Nov-2007
1
Main Changes
Document created from the ST62T55C/ST62T65C/ST62E65C, version 2.9, released
July 2001.
Differences between version 2.9 and current automotive version 1 are as follows:
Automotive root part numbers, ST62T55CM-Auto and ST62T65CM-Auto created on
page 1
FASTROM information added to page 1 and FASTROM cover page removed from
page 77
Updated “DEVICE SUMMARY” on page 1 to include only automotive devices
PDIP28 and SS0P28 packages removed from page 1, “PACKAGE MECHANICAL DATA” on page 74, Table 25, “. OTP/EPROM VERSION ORDERING INFORMATION,” on
page 75, Table 27, “. FASTROM version Ordering Information,” on page 76 and
“ST62P55CM/P65CM MICROCONTROLLER OPTION LIST” on page 77
Replaced 255 by 256 in the formula for max resolution ARTIMout duty cycle in section
4.3.2 on page 45
Altered note in “Capture Mode With Reset Of Counter And Prescaler, and PWM generation” paragraph on page 48
Added a note in the description of ARMC register in section 4.3.3 on page 49
Added Section 7.2 SOLDERING INFORMATION and Section 7.4 IMPORTANT NOTE
on page 75
Updated OTP sales types and added footnote 1 to Table 25
Updated FASTROM sales types in Table 27
Removed ROM device section and removed references to ROM device in the
“ST62P55CM/P65CM MICROCONTROLLER OPTION LIST” on page 77
Updated temperature ranges and package information in“ST62P55CM/P65CM MICROCONTROLLER OPTION LIST” on page 77
Section 7.3 ORDERING INFORMATION changed to Section 7.3 OTP/EPROM VERSION ORDERING INFORMATION
Removed Section 8 GENERAL DESCRIPTION
Section 8.1 INTRODUCTION changed to Section 7.5 FASTROM VERSION GENERAL
DESCRIPTION
Section 8.2 ORDERING INFORMATION changed to Section 7.6 FASTROM VERSION
ORDERING INFORMATION
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ST62T55CM-Auto ST62T65CM-Auto
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