mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 245

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

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
external interrupt brings the CPU out of stop mode. Exiting stop mode by reset aborts any transmission or
reception in progress and resets the SCI.
8.1.4
Figure 8-1
blocks.
Freescale Semiconductor
Bus Clk
RXD
Data In
is a high level block diagram of the SCI module, showing the interaction of various function
Block Diagram
Stop Mode
Generator
BAUD
Decoder
Infrared
Receive & Wakeup Control
Transmit Shift Register
16
MC9S12E256 Data Sheet, Rev. 1.08
Transmit Control
Receive Shift Register
SCI Data Register
Figure 8-1. SCI Block Diagram
SCI Data Register
Data Format Control
Encoder
Infrared
Generation
Generation
Chapter 8 Serial Communication Interface (SCIV4)
IRQ
IRQ
RDRF/OR
Interrupt
Request
TDRE
Interrupt
Request
IDLE Interrupt Request
TC Interrupt Request
Data Out
Interrupt
Request
SCI
TXD
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