MC9S08GB32 Motorola, MC9S08GB32 Datasheet - Page 21

• Manufacturer Part Number: MC9S08GB32
• Description: Microcontrollers
• Manufacturer: Motorola

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
•
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
Control bits inside the ICG determine which source is connected.
System Clock Distribution
lists the functional versions of the on-chip modules.
sub-module
ICGLCLK*
ICGERCLK
FFE
* ICGLCLK is the alternate BDC clock source for the MC9S08GB/GT.
ICGOUT
CPU
÷
CONTROL
2
SYSTEM
LOGIC
÷
2
FIXED FREQ CLOCK (XCLK)
Figure 1-3. System Clock Distribution Diagram
Serial Communications Interface (SCI)
Timer Pulse-Width Modulator (TPM)
RTI
BUSCLK
Analog-to-Digital Converter (ATD)
Serial Peripheral Interface (SPI)
Internal Clock Generator (ICG)
Central Processing Unit (CPU)
Inter-Integrated Circuit (IIC)
Keyboard Interrupt (KBI)
MC9S08GB/GT Data Sheet, Rev. 2.3
Table 1-2. Block Versions
Module
BDC
TPM1
TPM2
ATD has min and max
frequency requirements.
See
and
Characteristics.
IIC1
Figure 1-3
Appendix A, “Electrical
Chapter 1,
ATD1
Version
3
2
1
1
1
3
1
2
“Introduction”
SCI1
shows a simplified clock
RAM
SCI2
System Clock Distribution
FLASH has frequency
requirements for program
and erase operation.
See
Characteristics.
Appendix A, “Electrical
FLASH
SPI1
21