MC68HC908AB32CFU Freescale Semiconductor, MC68HC908AB32CFU Datasheet - Page 354
MC68HC908AB32CFU
Manufacturer Part Number
MC68HC908AB32CFU
Description
IC MCU 8MHZ 32K FLASH 64-QFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908AB32CFUE.pdf
(392 pages)
Specifications of MC68HC908AB32CFU
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
SCI, SPI
Peripherals
POR, PWM
Number Of I /o
51
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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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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