mc9s08gt32a Freescale Semiconductor, Inc, mc9s08gt32a Datasheet - Page 21

• Manufacturer Part Number: mc9s08gt32a
• Description: Hcs08 Microcontrollers 8-bit Microcontroller Family
• Manufacturer: Freescale Semiconductor, Inc

Table 1-2
1.4
Some of the modules inside the MCU have clock source choices.
connection diagram. The ICG supplies the clock sources:
Freescale Semiconductor
•
Control bits inside the ICG determine which source is connected.
ICG
ICGOUT is an output of the ICG module. It is one of the following:
— The external crystal oscillator
— An external clock source
— The output of the digitally-controlled oscillator (DCO) in the frequency-locked loop
System Clock Distribution
lists the functional versions of the on-chip modules.
sub-module
ICGLCLK*
ICGERCLK
FFE
ICGOUT
* ICGLCLK is the alternate BDC clock source for the MC9S08GBxxA/GTxxA.
CPU
÷
CONTROL
2
SYSTEM
LOGIC
÷
2
Figure 1-2. System Clock Distribution Diagram
FIXED FREQ CLOCK (XCLK)
Serial Communications Interface (SCI)
Timer Pulse-Width Modulator (TPM)
Analog-to-Digital Converter (ATD)
Serial Peripheral Interface (SPI)
Internal Clock Generator (ICG)
Central Processing Unit (CPU)
RTI
BUSCLK
Inter-Integrated Circuit (IIC)
MC9S08GB60A Data Sheet, Rev. 1.02
Keyboard Interrupt (KBI)
Table 1-2. Block Versions
Module
BDC
TPM1
TPM2
ATD has min and max
frequency requirements. See
Chapter 1, “Device
Appendix A, “Electrical
Figure 1-2
IIC1
Version
ATD1
3
2
1
1
1
3
1
2
SCI1
shows a simplified clock
Overview” and
Characteristics.
RAM
Chapter 1 Device Overview
SCI2
Flash has frequency
requirements for program
and erase operation.
See
Characteristics.
Appendix A, “Electrical
FLASH
SPI1
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