MC68HC08GZ32 Datasheet, PDF (72/320 Pages) Freescale Semiconductor, Inc – Microcontrollers

Mask Options
MCLK1 and MCLK0 — MCLK Output Select Bits
Setting the MCLK1 and MCLK0 bits enables the PTD0/SS pin to be used as a MCLK output clock.
Once configured for MCLK, the PTD data direction register for PTD0 is used to enable and disable the
MCLK output. See Table 5-1 for MCLK options.
Table 5-1. MCLK Output Select
MCLK1
0
0
1
1
MCLK0
0
1
0
1
MCLK Frequency
MCLK not enabled
Clock
Clock divided by 2
Clock divided by 4
MSCANEN— MSCAN08 Enable Bit
Setting the MSCANEN enables the MSCAN08 module and allows the MSCAN08 to use the PTC0/PTC1
pins. See Chapter 12 MSCAN08 Controller (MSCAN08) for a more detailed description of the
MSCAN08 operation.
1 = Enables MSCAN08 module
0 = Disables the MSCAN08 module
TMCLKSEL— Timebase Clock Select Bit
TMCLKSEL enables an extra divide-by-128 prescaler in the timebase module. Setting this bit enables
the extra prescaler and clearing this bit disables it. See Chapter 17 Timebase Module (TBM) for a more
detailed description of the external clock operation.
1 = Enables extra divide-by-128 prescaler in timebase module
0 = Disables extra divide-by-128 prescaler in timebase module
OSCENINSTOP — Oscillator Enable In Stop Mode Bit
OSCENINSTOP, when set, will enable the oscillator to continue to generate clocks in stop mode. See
Chapter 4 Clock Generator Module (CGM). This function is used to keep the timebase running while
the reset of the MCU stops. See Chapter 17 Timebase Module (TBM). When clear, oscillator will cease
to generate clocks while in stop mode.
1 = Oscillator enabled to operate during stop mode
0 = Oscillator disabled during stop mode (default)
SCIBDSRC — SCI Baud Rate Clock Source Bit
SCIBDSRC controls the clock source used for the serial communications interface (SCI). The setting
of this bit affects the frequency at which the SCI operates. See Chapter 14 Enhanced Serial
Communications Interface (ESCI) Module.
1 = Internal data bus clock used as clock source for SCI
0 = External oscillator used as clock source for SCI
MC68HC08GZ32 Data Sheet, Rev. 3
72
Freescale Semiconductor