Datasheet

Chapter 1 Introduction
MC9S08AW60 Data Sheet, Rev 2
Freescale Semiconductor 21
Table 1-3 lists the functional versions of the on-chip modules.
1.3 System Clock Distribution
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
— An external clock source
Table 1-3. Versions of On-Chip Modules
Module Version
Analog-to-Digital Converter (S08ADC10) 1
Internal Clock Generator (S08ICG) 4
Inter-Integrated Circuit (S08IIC) 1
Keyboard Interrupt (S08KBI) 1
Serial Communications Interface (S08SCI) 2
Serial Peripheral Interface (S08SPI) 3
Timer Pulse-Width Modulator (S08TPM) 2
Central Processing Unit (S08CPU) 2
Debug Module (DBG) 2
TPM1 TPM2 IIC1 SCI1 SCI2 SPI1
BDC
CPU
ADC1
RAM FLASH
ICG
ICGOUT
÷2
FFE
SYSTEM
LOGIC
BUSCLK
ICGLCLK*
CONTROL
FIXED FREQ CLOCK (XCLK)
ICGERCLK
RTI
* ICGLCLK is the alternate BDC clock source for the MC9S08AW60 Series.
÷2
FLASH has frequency
requirements for program
and erase operation.
See Appendix A, “Electrical
Characteristics and Timing
Specifications.
ADC has min and max
frequency requirements.
See Chapter 14,
“Analog-to-Digital Converter
(S08ADC10V1) and
Appendix A, “Electrical
Characteristics and Timing
Specifications