MC9S12A128 MOTOROLA [Motorola, Inc], MC9S12A128 Datasheet - Page 39

• Manufacturer Part Number: MC9S12A128
• Description: Microcontroller unit (MCU)
• Manufacturer: MOTOROLA [Motorola, Inc]

Section 3 System Clock Description
3.1 Overview
The Clock and Reset Generator provides the internal clock signals for the core and all peripheral modules.
Figure 3-1
Consult the HCS12 Clock and Reset Generator (CRG) Block Guide (Motorola document order number,
S12CRGV3/D) for details on clock generation.
EXTAL
XTAL
shows the clock connections from the CRG to all modules.
CRG
bus clock
oscillator clock
Figure 3-1 Clock Connections
1/2
core clock
BDM
S12_CORE
SCI0, SCI1
EEPROM
ATD0, 1
SPI0, 1
MC9S12A128 Device Guide — V01.01
Flash
PWM
RAM
ECT
PIM
IIC
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