mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 104

• Manufacturer Part Number: mc68hc908lj24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Oscillator (OSC)
Data Sheet
104
*R
See
Refer to manufacturer’s data.
S
STOP_XCLKEN
can be zero (shorted) when used with higher-frequency crystals.
STOP_IRCDIS
Section 24.
MCU
CONFIG2
CONFIG2
for component value requirements.
From SIM
INTERNAL RC OSCILLATOR
CRYSTAL OSCILLATOR
The reference clock for the CGM, real time clock module (RTC) and
other MCU sub-systems is driven by the crystal oscillator. The COP
module is always driven by internal RC clock.
The internal RC oscillator runs continuously after a POR or reset and is
always available in run and wait modes. In stop mode, it can be disabled
by setting the STOP_IRCDIS bit in CONFIG2 register.
Figure
Figure 7-1. Oscillator Module Block Diagram
7-1. shows the block diagram of the oscillator module.
OSC1
EN
INTERNAL RC
OSCILLATOR
Oscillator (OSC)
C
1
32.768kHz
(typical)
R
X
B
1
OSC2
R
C
S
*
2
CGMRCLK
CGMXCLK
MC68HC908LJ24/LK24 — Rev. 2.1
ICLK
Freescale Semiconductor
To SIM, COP
To CGM PLL
To RTC, ADC, LCD,
CGM Clock Selection MUX