参数资料
型号: MC68HSC05K0P
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, MICROCONTROLLER, PDIP16
封装: PLASTIC, DIP-16
文件页数: 136/154页
文件大小: 1544K
代理商: MC68HSC05K0P
Technical Data
MC68HC05K0 MC68HC05K1 — Rev. 2.0
82
Multifunction Timer
MOTOROLA
Technical Data
8.5 COP Watchdog
Three counter stages at the end of the timer make up the mask optional
computer operating properly (COP) watchdog (see Figure 8-1). 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, shown in
Figure 8-4, clears the COP watchdog and prevents a COP reset.
COPC — COP Clear Bit
This write-only bit resets the COP watchdog. Reading address $03F0
returns the ROM data at that address.
The COP watchdog is active in the run, wait, and halt modes of
operation. The STOP instruction disables the COP watchdog by clearing
the counter and turning off its clock source. In applications that depend
on the COP watchdog, the STOP instruction can be disabled (converted
to halt) by a mask option.
In applications that have wait cycles longer than the COP timeout period,
the COP watchdog can be disabled by a mask option.
NOTE:
If the voltage on the IRQ/VPP pin exceeds a nominal 1.5 × VDD, the COP
watchdog turns off and remains off until the IRQ/V
PP voltage falls below
2
× V
DD.
Address:
$03F0
Bit 7
654321
Bit 0
Read:
00000010
Write:
COPC
Reset:
UUUUUUU
0
= Unimplemented
U = Unaffected
Figure 8-4. COP Register (COPR)
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