MC9S12E32CFU FREESCALE [Freescale Semiconductor, Inc], MC9S12E32CFU Datasheet - Page 246
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MC9S12E32CFU
Manufacturer Part Number
MC9S12E32CFU
Description
HCS12 Microcontrollers
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC9S12E32CFU.pdf
(606 pages)
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Chapter 8 Serial Communication Interface (SCIV3)
8.1.3
The SCI functions the same in normal, special, and emulation modes. It has two low-power modes, wait
and stop modes.
8.1.3.1
Normal mode of operation.
8.1.3.2
SCI operation in wait mode depends on the state of the SCISWAI bit in the SCI control register 1
(SCICR1).
8.1.3.3
The SCI is inactive during stop mode for reduced power consumption. The STOP instruction does not
affect the SCI register states, but the SCI bus clock will be disabled. The SCI operation resumes after an
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Two receiver wakeup methods:
— Idle line wakeup
— Address mark wakeup
Interrupt-driven operation with eight flags:
— Transmitter empty
— Transmission complete
— Receiver full
— Idle receiver input
— Receiver overrun
— Noise error
— Framing error
— Parity error
Receiver framing error detection
Hardware parity checking
1/16 bit-time noise detection
If SCISWAI is clear, the SCI operates normally when the CPU is in wait mode.
If SCISWAI is set, SCI clock generation ceases and the SCI module enters a power-conservation
state when the CPU is in wait mode. Setting SCISWAI does not affect the state of the receiver
enable bit, RE, or the transmitter enable bit, TE.
If SCISWAI is set, any transmission or reception in progress stops at wait mode entry. The
transmission or reception resumes when either an internal or external interrupt brings the CPU out
of wait mode. Exiting wait mode by reset aborts any transmission or reception in progress and
resets the SCI.
Modes of Operation
Run Mode
Wait Mode
Stop Mode
MC9S12E128 Data Sheet, Rev. 1.07
Freescale Semiconductor
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