MC68HC908SR12CB Freescale Semiconductor, MC68HC908SR12CB Datasheet - Page 102

• Manufacturer Part Number: MC68HC908SR12CB
• Description: IC MCU 12K FLASH 8MHZ 42-SDIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908SR12CB

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, SCI
• Peripherals: LVD, POR, PWM, Temp Sensor
• Number Of I /o: 29
• Program Memory Size: 12KB (12K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b
• 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: -

Oscillator (OSC)
7.2 Introduction
Data Sheet
102
The oscillator module provides the reference clock for the clock
generator module (CGM), the timebase module (TBM), and other MCU
sub-systems.
The oscillator module consist of three types of oscillator circuits:
The reference clock for the CGM and other MCU sub-systems is
selected by:
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
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Internal oscillator
RC oscillator
Crystal (x-tal) oscillator
MC68HC908SR12 — FLASH device — oscillator selected by
programming the mask option register located at $FF80.
MC68HC08SR12 — ROM device — oscillator selected by ROM-
mask layer at factory.
7-1. shows the block diagram of the oscillator module.
Oscillator (OSC)
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Freescale Semiconductor