mc68hc908ap8cfa Freescale Semiconductor, Inc, mc68hc908ap8cfa Datasheet - Page 74

• Manufacturer Part Number: mc68hc908ap8cfa
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Oscillator (OSC)
5.3 Internal Oscillator
The internal oscillator clock (ICLK), with a frequency of f
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.
The internal oscillator by default is always available and is free running after POR or reset. It can be
turned-off in stop mode by setting the STOP_ICLKDIS bit before executing the STOP instruction.
Figure 5-4
74
shows the logical representation of components of the internal oscillator circuitry.
MCU
STOP_ICLKDIS
CONFIG2
From SIM
MC68HC908AP Family Data Sheet, Rev. 4
SIMOSCEN
Figure 5-4. Internal Oscillator
INTERNAL OSCILLATOR
To Clock Selection MUX
and COP
EN
ICLK
ICLK
, is a free running clock that requires no
BUS CLOCK
From SIM
OSC2
Freescale Semiconductor