MC9S12A128 Datasheet, PDF (39/92 Pages) Motorola, Inc – Microcontroller unit (MCU)

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