MC68HC908GR8A_07 Datasheet, PDF (196/260 Pages) Freescale Semiconductor, Inc – Microcontrollers

Timebase Module (TBM)
CGMXCLK
÷2 ÷2 ÷2
÷2
÷2
÷2
÷2
TBON
TBMINT
÷2 ÷2 ÷2 ÷2
÷2 ÷2
÷2 ÷2
TBIF
TBIE
000
R
001
010
011
100
101
110
111
Figure 16-1. Timebase Block Diagram
16.5 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-consumption standby modes.
16.5.1 Wait Mode
The timebase module remains active after execution of the WAIT instruction. In wait mode the timebase
register is not accessible by the CPU.
If the timebase functions are not required during wait mode, reduce the power consumption by stopping
the timebase before executing the WAIT instruction.
16.5.2 Stop Mode
The timebase module may remain active after execution of the STOP instruction if the internal clock
generator has been enabled to operate during stop mode through the OSCSTOPENB bit in the
configuration register. The timebase module can be used in this mode to generate a periodic wakeup from
stop mode.
If the internal clock generator has not been enabled to operate in stop mode, the timebase module will
not be active during stop mode. In stop mode, the timebase register is not accessible by the CPU.
MC68HC908GR8A • MC68HC908GR4A Data Sheet, Rev. 5
196
Freescale Semiconductor