MC9S08AW16CFUE Datasheet, PDF (129/324 Pages) Freescale Semiconductor, Inc – MC9S08AW60 Features

Chapter 8
Internal Clock Generator (S08ICGV4)
The internal clock generation (ICG) module is used to generate the system clocks for the MC9S08AW60
Series MCU. The analog supply lines V_DDA and V_SSA are internally derived from the MCU’s V_DD and
V_SS pins. Electrical parametric data for the ICG may be found in Appendix A, “Electrical Characteristics
and Timing Specifications.”
SYSTEM
CONTROL
LOGIC
ICGERCLK
RTI
FFE
TPM1
TPM2
IIC1
SCI1
SCI2
SPI1
÷2
ICG
FIXED FREQ CLOCK (XCLK)
ICGOUT
÷2
ICGLCLK*
BUSCLK
CPU
BDC
ADC
RAM
FLASH
* ICGLCLK is the alternate BDC clock source for the MC9S08AW60 Series.
ADC has min and max
frequency requirements.
See Chapter 14,
“Analog-to-Digital Converter
(S08ADC10V1) and
Appendix A, “Electrical
Characteristics and Timing
Specifications
FLASH has frequency
requirements for program
and erase operation.
See Appendix A, “Electrical
Characteristics and Timing
Specifications.
Figure 8-1. System Clock Distribution Diagram
NOTE
Freescale Semiconductor recommends that FLASH location $FFBE be
reserved to store a nonvolatile version of ICGTRM. This will allow
debugger and programmer vendors to perform a manual trim operation and
store the resultant ICGTRM value for users to access at a later time.
MC9S08AW60 Data Sheet, Rev 2
Freescale Semiconductor
129