參數資料
型號: M34571G6FP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO24
封裝: 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24
文件頁數: 59/126頁
文件大小: 1776K
代理商: M34571G6FP
Rev.1.02
May 25, 2007
Page 38 of 124
REJ03B0179-0102
4571 Group
When the watchdog timer is used, clear the WDF1 flag at the
period of 65534 machine cycles or less with the WRST
instruction.
When the watchdog timer is not used, execute the DWDT
instruction and the WRST instruction continuously (refer to
The watchdog timer is not stopped with only the DWDT
instruction.
The contents of WDF1 flag and timer WDT are initialized at the
RAM back-up mode.
When using the watchdog timer and the RAM back-up mode,
initialize the WDF1 flag with the WRST instruction just before
the microcomputer enters the RAM back-up state. Also, set the
NOP instruction after the WRST instruction, for the case when a
skip is performed with the WRST instruction (refer to Figure 39).
Fig 38. Program example to start/stop watchdog timer
Fig 39. Program example when using the watchdog
timer
WRST
; WDF1 flag cleared
DI
DWDT
; Watchdog timer function enabled/disabled
WRST
; WEF and WDF1 flags cleared
WRST
; WDF1 flag cleared
NOP
DI
; Interrupt disabled
EPOF
; POF instruction enabled
POF
; RAM back-up mode
Oscillation stop
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