s908ab32ag0cfue Freescale Semiconductor, Inc, s908ab32ag0cfue Datasheet - Page 354
s908ab32ag0cfue
Manufacturer Part Number
s908ab32ag0cfue
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.S908AB32AG0CFUE.pdf
(392 pages)
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Computer Operating Properly (COP)
20.3 Functional Description
Technical Data
354
INTERNAL RESET SOURCES
(COPRS FROM CONFIG1)
(COPD FROM CONFIG1)
RESET VECTOR FETCH
STOP INSTRUCTION
COPEN (FROM SIM)
NOTE:
COP RATE SEL
COPCTL WRITE
COPCTL WRITE
COP DISABLE
CGMXCLK
RESET
Figure 20-1
The COP counter is a free-running 6-bit counter preceded by a 12-bit
prescaler counter. If not cleared by software, the COP counter overflows
and generates an asynchronous reset after 2
CGMXCLK cycles, depending on the state of the COP rate select bit,
COPRS, in configuration register 1. With a 2
overflow option, a 4.9152MHz crystal gives a COP timeout period of
53.3ms. Writing any value to location $FFFF before an overflow occurs
prevents a COP reset by clearing the COP counter and stages 12
through 5 of the prescaler.
Service the COP immediately after reset and before entering or after
exiting stop mode to guarantee the maximum time before the first COP
counter overflow.
Figure 20-1. COP Block Diagram
COP MODULE
COP CLOCK
12-BIT COP PRESCALER
Computer Operating Properly (COP)
shows the structure of the COP module.
COP COUNTER
6-BIT COP COUNTER
CLEAR
RESET STATUS REGISTER
18
18
MC68HC908AB32
– 2
RESET CIRCUIT
– 2
Freescale Semiconductor
4
4
CGMXCLK cycle
or 2
13
– 2
4
—
Rev. 1.1
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