參數(shù)資料
型號: GMS87C7216LQ
廠商: Electronic Theatre Controls, Inc.
元件分類: 數(shù)學處理器
英文描述: 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 8位單晶片微控制器
文件頁數(shù): 79/121頁
文件大?。?/td> 1645K
代理商: GMS87C7216LQ
GMS81C7208/7216
FEB. 2005 Ver 1.04
75
counter which is free run can not be cleared. The watchdog timer
has 2-bit binary counter. It is incremented by 14-bit binary
counter match as shown in Figure 19-1. Interrupt request flag or
Reset signal are generated by overflow 2-bit binary counter.
During normal operation in the software, 2-bit binary counter
should be cleared by bit WDCLR of WDTR within watchdog
timer overflow.
The time of clearing must be within 3 times of 14-bit binary
counter interval as shown in Figure 19-3.
The worst case, watchdog time is just 3 times of 14-bit counter.
Figure 19-3 Watchdog Timer Timing
If the watchdog timer output becomes active, a reset is generated,
which drives the RESET pin low to reset the internal hardware.
The main clock oscillator also turns on when a watchdog timer re-
set is generated in sub clock mode.
14-bit binary
counter
2-bit binary
counter
WDTIF interrupt
Write WDCLR = 1 at this point
1
0
Counter
Clear
n
0
1
1FFE
~
~
1FFF
0
2
3
0
1
1FFE
1FFF
0
1
1FFE
1FFF
~
~
0
1
1FFE
1FFF
2
2
2
2
~
~
Even if user set to 1 sec.,
worst case 0.75 second
When WDTR = 0011_0111B
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