Configuration & Mask Option Registers (CONFIG & MOR)
3.4 Configuration Register 2 (CONFIG2)
Address:
$001D
Bit 7
6
5
4
3
2
0
1
0
Bit 0
Read:
Write:
Reset:
STOP_
ICLKDIS
STOP_ STOP_
RCLKEN XCLKEN
SCIBD-
SRC
OSCCLK1 OSCCLK0
0
0
0
0
0
0
0
0
Figure 3-3. 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
disables the oscillator during stop mode. (See Chapter 5 Oscillator (OSC).)
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. (See
Chapter 5 Oscillator (OSC).)
Reset 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.
(See Chapter 5 Oscillator (OSC).) Reset clears this bit.
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.
OSCCLK1
OSCCLK0
Timebase Clock Source
Internal oscillator (ICLK)
RC oscillator (RCCLK)
X-tal oscillator (XTAL)
Not used
0
0
1
1
0
1
0
1
MC68HC908AP Family Data Sheet, Rev. 4
52
Freescale Semiconductor
FREESCALE [ Freescale ]
