Chapter 15 Serial Communication Interface (S12MC9S12XDP512V5)
MC9S12XDP512 Data Sheet, Rev. 2.11
674 Freescale Semiconductor
• Hardware parity checking
• 1/16 bit-time noise detection
15.1.2 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
15.1.3 Block Diagram
Figure 15-1 is a high level block diagram of the SCI module, showing the interaction of various function
blocks.
Figure 15-1. 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