MC68HC908AP16CFB datasheet(71/440 Pages) MOTOROLA

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Configuration & Mask Option Registers (CONFIG & MOR)

Mask Option Register (MOR)

MC68HC908AP Family — Rev. 2.5

Data Sheet

MOTOROLA

5.5 Mask Option Register (MOR)

The mask option register (MOR) is used for selecting one of the three

clock options for the MCU. The MOR is a byte located in FLASH

memory, and is written to by a FLASH programming routine.

OSCSEL1, OSCSEL0 — Oscillator Selection Bits

OSCSEL1 and OSCSEL0 select which oscillator is used for the MCU

CGMXCLK clock. The erase state of these two bits is logic 1. These

bits are unaffected by reset. (See Table 5-1).

Bits 5–0 — Should be left as 1’s.

NOTE:

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 5-4. Mask Option Register (MOR)

Table 5-1. 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.

X-TAL

Inverting

output of

XTAL

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

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