MC9S08JM60_09 Datasheet, PDF (23/388 Pages) Freescale Semiconductor, Inc – HCS08 Microcontrollers

Chapter 1 Device Overview
“Analog-to-Digital Converter (S08ADC12V1),” for more information regarding the use of
MCGERCLK with these modules.
• MCGFFCLK — This clock source is divided by 2 to generate FFCLK after being synchronized to
the BUSCLK. It can be selected as clock source for the TPM modules. The frequency of the
MCGFFCLK is determined by the settings of the MCG. See the Section 12.4.7, “Fixed Frequency
Clock,” for details.
• LPO clock— This clock is generated from an internal Low Power Oscillator that is completely
independent of the MCG module. The LPO clock can be selected as the clock source to the RTC
or COP modules. See Chapter 13, “Real-Time Counter (S08RTCV1),” and Section 5.4, “Computer
Operating Properly (COP) Watchdog,” for details on using the LPO clock with these modules.
• TPMCLK — TPMCLK is the optional external clock source for the TPM modules. The TPMCLK
must be limited to 1/4th the frequency of the BUSCLK for synchronization. See Chapter 16,
“Timer/Pulse-Width Modulator (S08TPMV3),” for more details.
MC9S08JM60 Series Data Sheet, Rev. 3
Freescale Semiconductor
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