MC68HC908AP16CFB datasheet(93/440 Pages) MOTOROLA

93 / 440 page

Oscillator (OSC)

Clock Selection

MC68HC908AP Family — Rev. 2.5

Data Sheet

MOTOROLA

7.2.1 CGM Reference Clock Selection

The clock generator module (CGM) reference clock (CGMXCLK) is the

reference clock input to the MCU. It is selected by programming two bits

in a FLASH memory location; the mask option register (MOR), at

$FFCF. See 5.5 Mask Option Register (MOR).

The internal oscillator is a free running oscillator and is available after

each POR or reset. It is turned-off in stop mode by setting the

STOP_ICLKDIS bit in CONFIG2.

Address:

$FFCF

Bit 7

654321

Bit 0

Read:

OSCSEL1 OSCSEL0

RRRRRR

Write:

Reset:

Unaffected by reset

Erased:

11111111

R= Reserved

Figure 7-2. Mask Option Register (MOR)

Table 7-1. CGMXCLK Clock Selection

OSCSEL1

OSCSEL0

CGMXCLK

OSC2 Pin

Comments

—

Not used

ICLK

fBUS

Internal oscillator generates the CGMXCLK.

RCCLK

fBUS

RC oscillator generates the CGMXCLK.

Internal oscillator is available after each POR

or reset.

XCLK

Inverting

output of

X-TAL

X-tal oscillator generates the CGMXCLK.

Internal oscillator is available after each POR

or reset.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68HC908AP16CFB Datasheet(PDF) 93 Page - Motorola, Inc

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