MC9S08GB60A Datasheet, PDF (21/302 Pages) Freescale Semiconductor, Inc – HCS08 Microcontrollers

Table 1-2 lists the functional versions of the on-chip modules.
Table 1-2. Block Versions
Module
Analog-to-Digital Converter (ATD)
Internal Clock Generator (ICG)
Inter-Integrated Circuit (IIC)
Keyboard Interrupt (KBI)
Serial Communications Interface (SCI)
Serial Peripheral Interface (SPI)
Timer Pulse-Width Modulator (TPM)
Central Processing Unit (CPU)
Version
3
2
1
1
1
3
1
2
Chapter 1 Device Overview
1.4 System Clock Distribution
SYSTEM
CONTROL
LOGIC
ICGERCLK
RTI
FFE
TPM1
TPM2
÷2
ICG
FIXED FREQ CLOCK (XCLK)
IIC1
SCI1
SCI2
SPI1
ICGOUT
÷2
ICGLCLK*
BUSCLK
CPU
BDC
ATD1
RAM
FLASH
* ICGLCLK is the alternate BDC clock source for the MC9S08GBxxA/GTxxA.
ATD has min and max
Flash has frequency
frequency requirements. See
requirements for program
Chapter 1, “Device Overview” and and erase operation.
Appendix A, “Electrical Characteristics. See Appendix A, “Electrical
Characteristics.
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
— The output of the digitally-controlled oscillator (DCO) in the frequency-locked loop
sub-module
Control bits inside the ICG determine which source is connected.
MC9S08GB60A Data Sheet, Rev. 2
Freescale Semiconductor
21