mc68hc705j2 Freescale Semiconductor, Inc, mc68hc705j2 Datasheet - Page 62
mc68hc705j2
Manufacturer Part Number
mc68hc705j2
Description
8-bit Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC705J2.pdf
(78 pages)
- Current page: 62 of 78
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COPC — COP Clear
7.3 COP Timer
COPR — COP Register
RESET
MOTOROLA
7-4
This write-only bit resets the COP timer. Reading address $0FF0 returns the
EPROM data at that address.
Three counter stages at the end of the timer make up the computer operating
properly (COP) timer. (See Figure 7-1.) The COP timer is a software error
detection system that automatically times out and resets the MCU if not cleared
periodically by a program sequence. Writing a zero to bit 0 of the COP register
clears the COP timer and prevents a COP timer reset. (See Figure 7-4.)
Bit 7
—
—
—
—
6
Figure 7-4. COP Register (COPR)
—
—
5
—
—
4
TIMER
MC68HC05J1 Emulation Mode: $ 0 7 F 0
—
—
3
—
—
2
—
—
1
MC68HC705J2
COPC
Bit 0
0
$ 0 F F 0
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