參數(shù)資料
型號: M34524EDFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PQFP64
封裝: 14 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-64
文件頁數(shù): 37/66頁
文件大小: 1936K
代理商: M34524EDFP
Rev.1.04
Aug 23, 2007
Page 42 of 146
REJ03B0188-0104
4559 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
power down mode.
When using the watchdog timer and the power down mode,
initialize the WDF1 flag with the WRST instruction just before
the microcomputer enters the power down mode. Also, set the
NOP instruction after the WRST instruction, for the case when a
skip is performed with the WRST instruction (refer to Figure 42).
Fig 41. Program example to start/stop watchdog timer
Fig 42. 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
POF2
; RAM back-up mode
Oscillation stop
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