MC68HC908QC16_07 Datasheet, PDF (102/274 Pages) Freescale Semiconductor, Inc – Microcontrollers

Oscillator Mode (OSC)
SIMOSCEN (internal signal) OR
OSCENINSTOP (bit located in
configuration register))
INTCLK
0
1
EN
EXTERNAL RC
OSCILLATOR
RCCLK
OSCOPT = EXTERNAL RC SELECTED
BUSCLKX4
BUSCLKX2
÷2
1
0
ALTERNATIVE
PIN FUNCTION
MCU
OSC2EN
OSC1
OSC2- available for alternative pin function
V_DD
R_EXT
See the Electricals section
for component value.
Figure 10-3. RC Oscillator External Connections
10.4 Interrupts
There are no interrupts associated with the OSC module.
10.5 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-consumption standby modes.
10.5.1 Wait Mode
The OSC module remains active in wait mode.
10.5.2 Stop Mode
The OSC module can be configured to remain active in stop mode by setting OSCENINSTOP located in
a configuration register.
10.6 OSC During Break Interrupts
There are no status flags associated with the OSC module.
The system integration module (SIM) controls whether status bits in other modules can be cleared during
the break state. The BCFE bit in the break flag control register (BFCR) enables software to clear status
bits during the break state. See BFCR in the SIM section of this data sheet.
To allow software to clear status bits during a break interrupt, write a 1 to BCFE. If a status bit is cleared
during the break state, it remains cleared when the MCU exits the break state.
MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 3
102
Freescale Semiconductor