MC68HC908AP16CFB datasheet(70/440 Pages) MOTOROLA

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Configuration & Mask Option Registers

Data Sheet

MC68HC908AP Family — Rev. 2.5

MOTOROLA

STOP_XCLKEN — X-tal Oscillator Stop Mode Enable Bit

STOP_XCLKEN enables the crystal (x-tal) oscillator to continue

operating during stop mode. Setting the STOP_XCLKEN bit allows

the x-tal oscillator to operate continuously even during stop mode.

This is useful for driving the timebase module to allow it to generate

periodic wake up while in stop mode. (See Section 7. Oscillator

(OSC).) Reset clears this bit.

1 = X-tal oscillator enabled to operate during stop mode

0 = X-tal oscillator disabled during stop mode

OSCCLK1, OSCCLK0 — Oscillator Output Control Bits

OSCCLK1 and OSCCLK0 select which oscillator output to be driven

out as OSCCLK to the timebase module (TBM). Reset clears these

two bits.

SCIBDSRC — SCI Baud Rate Clock Source

SCIBDSRC selects the clock source used for the standard SCI

module (non-infrared SCI). The setting of this bit affects the frequency

at which the SCI operates.

1 = Internal data bus clock, fBUS, is used as clock source for SCI

0 = Oscillator clock, CGMXCLK, is used as clock source for SCI

OSCCLK1

OSCCLK0

Timebase Clock Source

Internal oscillator (ICLK)

RC oscillator (RCCLK)

X-tal oscillator (XTAL)

Not used

Freescale Semiconductor, Inc.

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