MC68HC908LJ12 Datasheet, PDF (247/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

Infrared Serial Communications
13.8 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-
consumption standby modes.
13.8.1 Wait Mode
The SCI module remains active after the execution of a WAIT
instruction. In wait mode, the SCI module registers are not accessible by
the CPU. Any enabled CPU interrupt request from the SCI module can
bring the MCU out of wait mode.
If SCI module functions are not required during wait mode, reduce power
consumption by disabling the module before executing the WAIT
instruction.
Refer to 9.7 Low-Power Modes for information on exiting wait mode.
13.8.2 Stop Mode
The SCI module is inactive after the execution of a STOP instruction.
The STOP instruction does not affect SCI register states. SCI module
operation resumes after an external interrupt.
Because the internal clock is inactive during stop mode, entering stop
mode during an SCI transmission or reception results in invalid data.
Refer to 9.7 Low-Power Modes for information on exiting stop mode.
Technical Data
248
MC68HC908LJ12 — Rev. 2.1
Infrared Serial Communications Interface Module (IRSCI) Freescale Semiconductor