
Configuration & Mask Option Registers (CONFIG & MOR)
MC68HC908AP Family Data Sheet, Rev. 4
52
Freescale Semiconductor
3.4 Configuration Register 2 (CONFIG2)
STOP_ICLKDIS — Internal Oscillator Stop Mode Disable
STOP_ICLKDIS disables the internal oscillator during stop mode. Setting the STOP_ICLKDIS bit
Reset clears this bit.
1 = Internal oscillator disabled during stop mode
0 = Internal oscillator enabled to operate during stop mode
STOP_RCLKEN — RC Oscillator Stop Mode Enable Bit
STOP_RCLKEN enables the RC oscillator to continue operating during stop mode. Setting the
STOP_RCLKEN bit allows the oscillator to operate continuously even during stop mode. This is useful
for driving the timebase module to allow it to generate periodic wake up while in stop mode.
(SeeReset clears this bit.
1 = RC oscillator enabled to operate during stop mode
0 = RC oscillator disabled during stop mode
STOP_XCLKEN — X-tal Oscillator Stop Mode Enable Bit
STOP_XCLKEN enables the crystal (x-tal) oscillator to continue operating during stop mode. Setting
the STOP_XCLKEN bit allows the x-tal oscillator to operate continuously even during stop mode. This
is useful for driving the timebase module to allow it to generate periodic wake up while in stop mode.
1 = X-tal oscillator enabled to operate during stop mode
0 = X-tal oscillator disabled during stop mode
OSCCLK1, OSCCLK0 — Oscillator Output Control Bits
OSCCLK1 and OSCCLK0 select which oscillator output to be driven out as OSCCLK to the timebase
module (TBM). Reset clears these two bits.
Address:
$001D
Bit 7
654321
Bit 0
Read:
STOP_
ICLKDIS
STOP_
RCLKEN
STOP_
XCLKEN
OSCCLK1
OSCCLK0
00
SCIBD-
SRC
Write:
Reset:
00000000
Figure 3-3. Configuration Register 2 (CONFIG2)
OSCCLK1
OSCCLK0
Timebase Clock Source
0
Internal oscillator (ICLK)
0
1
RC oscillator (RCCLK)
1
0
X-tal oscillator (XTAL)
1
Not used