MC68HC908AP8CB Freescale Semiconductor, MC68HC908AP8CB Datasheet - Page 71

• Manufacturer Part Number: MC68HC908AP8CB
• Description: IC MCU 8K FLASH 8MHZ 42SDIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908AP8CB

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, IRSCI, SCI, SPI
• Peripherals: LED, LVD, POR, PWM
• Number Of I /o: 32
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 42-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

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
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•
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•
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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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