参数资料
型号: M68HC05M68H
厂商: Motorola, Inc.
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件页数: 43/130页
文件大小: 1541K
代理商: M68HC05M68H
Resets
Internal Resets
MC68HC705P6A
Rev. 2.0
Advance Information
MOTOROLA
Resets
43
voltage range (between V
SS
V
DD
), the COP watchdog timer
s output will
be restored if the COP bit in the mask option register (MOR) is set.
The COP register is shared with the least significant byte (LSB) of an
unused vector address as shown in
Figure 4-2
. Reading this location will
return the programmed value of the unused user interrupt vector,
usually 0. Writing to this location will clear the COP watchdog timer.
When the COP watchdog timer expires, it will generate the RST signal
and reset the MCU. If any other reset function is active at the end of the
COP reset signal, the RST signal will remain in the reset condition until
the other reset condition(s) end. When the reset condition ends, the
MCU
s operating mode will be selected (see
Table 3-1
).
Address:
$1FF0
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
0
0
0
0
0
0
0
Write:
COPR
= Unimplemented
Figure 4-2. Unused Vector and COP Watchdog Timer
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