MC68HC708XL36 FREESCALE [Freescale Semiconductor, Inc], MC68HC708XL36 Datasheet - Page 306

• Manufacturer Part Number: MC68HC708XL36
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

COP
Functional Description
MC68HC708XL36
306
The COP counter is a free-running 6-bit counter preceded by a 12-bit
prescaler. If not cleared by software, the COP counter overflows and
generates an asynchronous reset after 2
cycles, depending on the state of the COP rate select bit, COPRS, in the
configuration register. When COPRS = 0, a 4.9152-MHz crystal gives a
COP timeout period of 53.3 ms. Writing any value to location $FFFF
before an overflow occurs prevents a COP reset by clearing the COP
counter and stages 5 through 12 of the prescaler.
INTERNAL RESET SOURCES
RESET VECTOR FETCH
Freescale Semiconductor, Inc.
COPRS FROM CONFIG
COPD FROM CONFIG
STOP INSTRUCTION
For More Information On This Product,
COPCTL WRITE
COPCTL WRITE
CGMXCLK
Go to: www.freescale.com
RESET
Figure 1. COP Block Diagram
COP
12-BIT COP PRESCALER
CLEAR COP
COUNTER
6-BIT COP COUNTER
13
– 2
4
or 2
18
– 2
4
CGMXCLK
RESET
RESET STATUS
REGISTER
MOTOROLA
2-copopt2_b