參數(shù)資料
型號: MC68HCL05J1ADWR2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封裝: SOIC-20
文件頁數(shù): 99/126頁
文件大?。?/td> 1118K
代理商: MC68HCL05J1ADWR2
Technical Data
MC68HC05J1A — Rev. 1.0
74
Multifunction Timer
MOTOROLA
Multifunction Timer
8.4 COP Watchdog
Four counter stages at the end of the timer make up the mask-optional
computer operating properly (COP) watchdog. (See Figure 8-4.)
The COP watchdog is a software error detection system that
automatically times out and resets the MCU if not cleared periodically by
a program sequence. Writing a logic 0 to bit 0 of the COP register clears
the COP watchdog and prevents a COP reset.
COPC — COP Clear Bit
This write-only bit resets the COP watchdog. Reading address $07F0
returns the ROM data at that address.
NOTE:
The STOP instruction turns off the COP watchdog. In applications that
depend on the COP watchdog, the STOP instruction can be disabled by
a mask option.
Address:
$07F0
Bit 7
654321
Bit 0
Read:
Write:
COPC
Reset:
UUUUUUU
0
= Unimplemented
Figure 8-4. COP Register (COPR)
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