MC68HC908GR8CD Freescale Semiconductor, MC68HC908GR8CD Datasheet - Page 93
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MC68HC908GR8CD
Manufacturer Part Number
MC68HC908GR8CD
Description
8-bit Microcontrollers - MCU 8 Bit 8MHz
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68HC908GR8CD.pdf
(286 pages)
Specifications of MC68HC908GR8CD
Product Category
8-bit Microcontrollers - MCU
Rohs
yes
Core
HC08
Data Bus Width
8 bit
Maximum Clock Frequency
8 MHz
Program Memory Size
64 KB
Data Ram Size
384 B
Operating Supply Voltage
3 V to 5 V
Package / Case
SOIC-28
Mounting Style
SMD/SMT
Data Rom Size
64 KB
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
21
Program Memory Type
Flash
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Chapter 9
Computer Operating Properly (COP)
9.1 Introduction
The computer operating properly (COP) module contains a free-running counter that generates a reset if
allowed to overflow. The COP module helps software recover from runaway code. Prevent a COP reset
by clearing the COP counter periodically. The COP module can be disabled through the COPD bit in the
CONFIG register.
9.2 Functional Description
Figure 9-1
Freescale Semiconductor
INTERNAL RESET SOURCES
shows the structure of the COP module.
RESET VECTOR FETCH
STOP INSTRUCTION
COPEN (FROM SIM)
(FROM CONFIG)
COP RATE SEL
(FROM CONFIG)
COPCTL WRITE
COPCTL WRITE
COP DISABLE
CGMXCLK
RESET
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
COP MODULE
COP CLOCK
12-BIT COP PRESCALER
Figure 9-1. COP Block Diagram
COP COUNTER
6-BIT COP COUNTER
CLEAR
RESET STATUS REGISTER
RESET CIRCUIT
93
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