MC908AB32CFUE Datasheet, PDF (259/392 Pages) Freescale Semiconductor, Inc – Microcontrollers

Serial Communications Interface Module (SCI)
• 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.
15.6 Low-Power Modes
The WAIT and STOP instructions put the MCU in low power-
consumption standby modes.
15.6.1 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 8.7 Low-Power Modes for information on exiting wait mode.
15.6.2 Stop Mode
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 8.7 Low-Power Modes for information on exiting stop mode.
MC68HC908AB32 — Rev. 1.1
Freescale Semiconductor
Serial Communications Interface Module (SCI)
Technical Data
259