MC68HC812A4 Datasheet, PDF (226/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

Serial Communications Interface Module (SCI)
14.4 Block Diagram
SCI DATA
REGISTER
RXD
RECEIVE
SHIFT REGISTER
MODULE
CLOCK
BAUD RATE
GENERATOR
RECEIVE
AND WAKEUP
CONTROL
SBR[12:0]
16
DATA FORMAT
CONTROL
TRANSMIT
CONTROL
T8
TRANSMIT
SHIFT REGISTER
SCI DATA
REGISTER
RE
RWU
LOOPS
RSRC
M
WAKE
ILT
PE
PT
TE
LOOPS
SBK
RSRC
R8
NF
FE
PF
RAF
ILIE
IDLE
RDRF
OR
RIE
TIE
TDRE
TC
TCIE
TXD
RXD TO SCI1
TXD FROM SCI1
WOMS
PIN CONTROL LOGIC
PORT S DATA
DIRECTION REGISTER
PORT S DATA REISTER
3210
RXD0
TXD0
RXD1
TXD1
Figure 14-1. SCI Block Diagram
SCI
INTERRUPT
REQUEST
SCI
INTERRUPT
REQUEST
SCI
INTERRUPT
REQUEST
SCI
INTERRUPT
REQUEST
MC68HC812A4 — Rev. 3.0
226
Serial Communications Interface Module (SCI)
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