MC9S12KG128 Datasheet, PDF (327/600 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 10 Serial Communications Interface (SCIV1)
RX DATA IN
BUS CLOCK
SCI DATA REGISTER
RECEIVE SHIFT REGISTER
RECEIVE & WAKE UP CONTROL
BAUD
GENERATOR
÷16
DATA FORMAT CONTROL
TRANSMIT CONTROL
TRANSMIT SHIFT REGISTER
SCI DATA REGISTER
Figure 10-1. SCI Block Diagram
10.2 External Signal Description
The SCI module has a total of two external pins:
10.2.1 TXD-SCI Transmit Pin
This pin serves as transmit data output of SCI.
10.2.2 RXD-SCI Receive Pin
This pin serves as receive data input of the SCI.
IDLE IRQ
RDR/OR IRQ
TDRE IRQ
TC IRQ
IRQ
TO CPU
TXDATA OUT
MC9S12KG128 Data Sheet, Rev. 1.15
Freescale Semiconductor
327