MC68HC908JL8 MOTOROLA [Motorola, Inc], MC68HC908JL8 Datasheet - Page 189

• Manufacturer Part Number: MC68HC908JL8
• Description: Motorola reserves the right to make changes without further notice to any products herein
• Manufacturer: MOTOROLA [Motorola, Inc]

11.6 Low-Power Modes
11.6.1 Wait Mode
11.6.2 Stop Mode
11.7 SCI During Break Module Interrupts
MC68HC908JL8
MOTOROLA
—
Rev. 2.0
The WAIT and STOP instructions put the MCU in low power-
consumption standby modes.
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
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
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.
To allow software to clear status bits during a break interrupt, write a
logic 1 to the BCFE bit. If a status bit is cleared during the break state, it
remains cleared when the MCU exits the break state.
Freescale Semiconductor, Inc.
For More Information On This Product,
Serial Communications Interface (SCI)
7.7 Low-Power Modes
7.7 Low-Power Modes
Go to: www.freescale.com
for information on exiting wait mode.
for information on exiting stop mode.
Serial Communications Interface (SCI)
Low-Power Modes
Technical Data
189