MC68HC908AP16CFB datasheet(94/440 Pages) MOTOROLA

94 / 440 page

Oscillator (OSC)

Data Sheet

MC68HC908AP Family — Rev. 2.5

MOTOROLA

7.2.2 TBM Reference Clock Selection

The timebase module reference clock (OSCCLK) is selected by

configuring two bits in the CONFIG2 register, at $001D. See 5.4

Configuration Register 2 (CONFIG2).

NOTE:

The RCCLK or XCLK is only available if that clock is selected as the

CGM reference clock, whereas the ICLK is always available.

7.3 Internal Oscillator

The internal oscillator clock (ICLK), with a frequency of fICLK, is a free

running clock that requires no external components. It can be selected

as the CGMXCLK for the CGM and MCU sub-systems; and the

OSCCLK clock for the TBM. The ICLK is also the reference clock input

to the computer operating properly (COP) module.

Due to the simplicity of the internal oscillator, it does not have the

accuracy and stability of the RC oscillator or the x-tal oscillator.

Therefore, the ICLK is not suitable where an accurate bus clock is

required and it should not be used as the CGMRCLK to the CGM PLL.

Address:

$001D

Bit 7

654321

Bit 0

Read:

STOP_

ICLKDIS

STOP_

RCLKEN

STOP_

XCLKEN

OSCCLK1 OSCCLK0

SCIBDSRC

Write:

Reset:

00000000

Figure 7-3. Configuration Register 2 (CONFIG2)

Table 7-2. Timebase Module Reference Clock Selection

OSCCLK1

OSCCLK0

Timebase Clock Source

Internal oscillator (ICLK)

RC oscillator (RCCLK)

X-tal oscillator (XCLK)

Not used

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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