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HC705P6AGRS/D bảng dữ liệu(PDF) 41 Page - NXP Semiconductors

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Giải thích chi tiết về linh kiện  The Motorola MC68HC705P6A is an EPROM version of the MC68HC05P6 microcontroller
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General Release Specification
Internal Resets
MC68HC705P6A — Rev. 1.0
General Release Specification
Resets
voltage range (between VSS–VDD), the COP watchdog timer’s output will
be restored if the COP bit in the MOR is set.
The COP register is shared with the 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 zero.
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).
$1FF0
Bit 7
654321
Bit 0
Read:
00000000
Write:
COPR
= Unimplemented
Figure 4-2. Unused Vector and COP Watchdog Timer
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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