Datasheet

Chapter 20 Serial Communication Interface (S12SCIV5)
MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor 725
20.1.4 Block Diagram
Figure 20-1 is a high level block diagram of the SCI module, showing the interaction of various function
blocks.
Figure 20-1. SCI Block Diagram
SCI Data Register
RXD Data In
Data Out TXD
Receive Shift Register
Infrared
Decoder
Receive & Wakeup
Control
Data Format Control
Transmit Control
Baud Rate
Generator
Bus Clock
1/16
Transmit Shift Register
SCI Data Register
Receive
Interrupt
Generation
Transmit
Interrupt
Generation
Infrared
Encoder
IDLE
RDRF/OR
TC
TDRE
BRKD
BERR
RXEDG
SCI
Interrupt
Request