MC9S08AC60 Datasheet, PDF (22/348 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 1 Introduction
Table 1 lists the functional versions of the on-chip modules.
Table 1. Versions of On-Chip Modules
Module
Cyclic Redundancy Check Generator
Analog-to-Digital Converter
Internal Clock Generator
Inter-Integrated Circuit
Keyboard Interrupt
Serial Communications Interface
Serial Peripheral Interface
Timer Pulse-Width Modulator
Central Processing Unit
Debug Module
(CRC)
(ADC)
(ICG)
(IIC)
(KBI)
(SCI)
(SPI)
(TPM)
(CPU)
(DBG)
Version
1
1
4
2
1
4
3
3
2
2
1.3 System Clock Distribution
TPM1CLK TPM2CLK
SYSTEM
CONTROL
LOGIC
ICGERCLK
RTI
FFE
÷2
ICG
XCLK**
TPM1
TPM2
IIC1
SCI1
ICGOUT
÷2
ICGLCLK*
1 kHz
BUSCLK
SCI2
SPI1
CPU
COP
BDC
TPM3
ADC1
RAM
FLASH
TPMCLK
CRC
* ICGLCLK is the alternate BDC clock source for the MC9S08AC60 Series.
** _{Fixed frequency clock.}
Figure 1-2. System Clock Distribution Diagram
Some of the modules inside the MCU have clock source choices. Figure 1-2 shows a simplified clock
connection diagram. The ICG supplies the clock sources:
• ICGOUT is an output of the ICG module. It is one of the following:
— The external crystal oscillator
MC9S08AC60 Series Data Sheet, Rev. 2
22
Freescale Semiconductor