Datasheet

Chapter 8 Serial Communication Interface (SCIV3)
MC9S12E128 Data Sheet, Rev. 1.07
Freescale Semiconductor 247
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 Block Diagram
Figure 8-1 is a high level block diagram of the SCI module, showing the interaction of various function
blocks.
Figure 8-1. SCI Block Diagram
SCI Data Register
Receive Shift Register
Receive & Wakeup Control
Data Format Control
Transmit Control
Transmit Shift Register
SCI Data Register
BAUD
Generator
IRQ
Generation
IRQ
Generation
RXD Data In
÷16
Bus Clk
Encoder
Infrared
Data Out TXD
Decoder
Infrared
TC Interrupt Request
IDLE Interrupt Request
SCI
Interrupt
Request
RDRF/OR
Interrupt
Request
TDRE
Interrupt
Request