HCS08 datasheet(81/290 Pages) MOTOROLA

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Data Sheet — MC9S08GB60/D V1.5

MOTOROLA

MC9S08GB/GT

Section 6 Internal Clock Generator (ICG) Module

The MC9S08GB/GT microcontroller provides one internal clock generation (ICG) module to create the

system bus frequency. All functions described in this section are available on the MC9S08GB/GT

microcontroller. The EXTAL and XTAL pins share port G bits 2 and 1, respectively. Analog supply lines

VDDA and VSSA are internally derived from the MCU’s VDD and VSS pins. Electrical parametric data for

the ICG may be found in the Electrical Characteristics appendix.

Figure 6-1 System Clock Distribution Diagram

NOTE:

Motorola 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.

TPM1

TPM2

IIC

SCI1

SCI2

SPI

BDC

CPU

ATD

RAM

FLASH

ICG

ICGOUT

÷2

FFE

SYSTEM

LOGIC

BUSCLK

ICGLCLK*

ATD has min and max

frequency requirements.

See ATD section and

FLASH has frequency

requirements for program

and erase operation.

See Appendix A.

Appendix A.

CONTROL

FIXED FREQ CLOCK (XCLK)

ICGERCLK

RTI

* ICGLCLK is the alternate BDC clock source for the MC9S08GB/GT.

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