M166 Datasheet, PDF (108/127 Pages) Siemens Semiconductor Group – C16x Family of Siemens 16-Bit CMOS Single-Chip Microcontrollers

30Mar98@15:00h
C166 Family Instruction Set
Instruction Description
SRVWDT
Service Watchdog Timer
SRVWDT
Syntax
Operation
Description
SRVWDT
Service Watchdog Timer
This instruction services the Watchdog Timer. It reloads the high order
byte of the Watchdog Timer with a preset value and clears the low byte on
every occurrence. Once this instruction has been executed, the watchdog
timer cannot be disabled. To insure that this instruction is not accidentally
executed, it is implemented as a protected instruction.
Condition Flags
E
Z
V
C
N
-
-
-
-
-
Addressing Modes
E Not affected.
Z Not affected.
V Not affected.
C Not affected.
N Not affected.
Mnemonic
SRVWDT
Format
A7 58 A7 A7
Bytes
4
Semiconductor Group
108
Version 1.2, 12.97