MC68HC908AB32CFU Freescale Semiconductor, MC68HC908AB32CFU Datasheet - Page 133
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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9.4 Functional Description
MC68HC908AB32
Freescale Semiconductor
SIMOSCEN
OSC2
OSC1
CGMRDV
DETECTOR
DETECTOR
—
CGMVDV
PHASE
LOCK
LOCK
Rev. 1.1
CRYSTAL OSCILLATOR
The CGM consists of three major sub-modules:
Figure 9-1
•
•
•
V
DDA
CGMRCLK
Crystal oscillator circuit which generates the constant crystal
frequency clock, CGMXCLK.
Phase-locked loop (PLL) which generates the programmable
VCO frequency clock CGMVCLK.
Base clock selector circuit; this software-controlled circuit selects
either CGMXCLK divided by two or the VCO clock CGMVCLK
divided by two, as the base clock CGMOUT. The SIM derives the
system clocks from CGMOUT.
Figure 9-1. CGM Block Diagram
AUTO
FREQUENCY
BANDWIDTH
CONTROL
CGMXFC
MUL[7:4]
DIVIDER
Clock Generator Module (CGM)
FILTER
shows the structure of the CGM.
LOOP
ACQ
PLL ANALOG
V
SS
CIRCUIT
SELECT
CLOCK
PLLIE
CONTROLLED
BCS
OSCILLATOR
INTERRUPT
CONTROL
CGMVCLK
VOLTAGE
VRS[7:4]
PLLF
÷
2
CGMXCLK
A
B S*
Clock Generator Module (CGM)
*When S = 1, CGMOUT = B
CGMOUT
CGMINT
USER MODE
PTC3
MONITOR MODE
TO SIM, SCI
Technical Data
TO SIM
133
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