MC9S12XEP100 Datasheet, PDF (733/1036 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 19 Serial Communication Interface (S12SCIV5)
19.2.3 Modes of Operation
The SCI functions the same in normal, special, and emulation modes. It has two low power modes, wait
and stop modes.
• Run mode
• Wait mode
• Stop mode
19.2.4 Block Diagram
Figure 19-1 is a high level block diagram of the SCI module, showing the interaction of various function
blocks.
RXD Data In
Infrared
Decoder
Bus Clock _{Baud Rate}
Generator
1/16
SCI Data Register
Receive Shift Register
Receive & Wakeup
Control
Data Format Control
Transmit Control
IDLE
Receive
Interrupt ^RDRF/OR
Generation BRKD
RXEDG
BERR
Transmit
Interrupt ^TDRE
Generation TC
SCI
Interrupt
Request
Transmit Shift Register
Infrared
Encoder
SCI Data Register
Figure 19-1. SCI Block Diagram
Data Out TXD
MC9S12XE-Family Reference Manual Rev. 1.07
Freescale Semiconductor
733