MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 259
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MC68HC908AB32
Manufacturer Part Number
MC68HC908AB32
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AB32.pdf
(392 pages)
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15.6 Low-Power Modes
15.6.1 Wait Mode
15.6.2 Stop Mode
MC68HC908AB32
MOTOROLA
—
Rev. 1.0
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,
and thus the SCI cannot cause an interrupt to exit stop mode. 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
•
•
Freescale Semiconductor, Inc.
Serial Communications Interface Module (SCI)
For More Information On This Product,
Framing error (FE) — The FE bit in SCS1 is set when a logic 0
occurs where the receiver expects a stop bit. The framing error
interrupt enable bit, FEIE, in SCC3 enables FE to generate SCI
error CPU interrupt requests.
Parity error (PE) — The PE bit in SCS1 is set when the SCI
detects a parity error in incoming data. The parity error interrupt
enable bit, PEIE, in SCC3 enables PE to generate SCI error CPU
interrupt requests.
8.7 Low-Power Modes
8.7 Low-Power Modes
Go to: www.freescale.com
Serial Communications Interface Module (SCI)
for information on exiting wait mode.
for information on exiting stop mode.
Low-Power Modes
Technical Data
259
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