MC908AP32CFBE Freescale, MC908AP32CFBE Datasheet - Page 71

• Manufacturer Part Number: MC908AP32CFBE
• Manufacturer: Freescale

Specifications of MC908AP32CFBE

• Cpu Family: HC08
• Device Core Size: 8b
• Frequency (max): 8MHz
• Interface Type: SCI/SPI
• Total Internal Ram Size: 2KB
• # I/os (max): 32
• Number Of Timers - General Purpose: 4
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 8-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Package Type: PQFP
• Program Memory Type: Flash
• Program Memory Size: 32KB
• Lead Free Status / RoHS Status: Compliant

Chapter 5
Oscillator (OSC)
5.1 Introduction
The oscillator module consist of three types of oscillator circuits:
The reference clock for the CGM and other MCU sub-systems is selected by programming the mask
option register located at $FFCF.
The reference clock for the timebase module (TBM) is selected by the two bits, OSCCLK1 and OSCCLK0,
in the CONFIG2 register.
The internal oscillator runs continuously after a POR or reset, and is always available. The RC and crystal
oscillator cannot run concurrently; one is disabled while the other is selected; because the RC and x-tal
circuits share the same OSC1 pin.
Figure
5.2 Clock Selection
Reference clocks are selectable for the following sub-systems:
Freescale Semiconductor
•
•
•
•
•
Internal oscillator
RC oscillator
32.768kHz crystal (x-tal) oscillator
CGMXCLK and CGMRCLK — Reference clock for clock generator module (CGM) and other MCU
sub-systems other than TBM and COP. This is the main reference clock for the MCU.
OSCCLK — Reference clock for timebase module (TBM).
5-1. shows the block diagram of the oscillator module.
The oscillator circuits are powered by the on-chip V
therefore, the output swing on OSC1 and OSC2 is from V
MC68HC908AP Family Data Sheet, Rev. 4
NOTE
REG
regulator,
SS
to V
REG
.
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