(WRITE-ONLY)
TRANSMITTER
BAUD RATE
CLOCK
SCDR Tx BUFFER
MDDR7
MDDR5
TxD
10 (11) - BIT
Tx SHIFT REGISTER
PIN BUFFER
AND CONTROL
H (8)
7
6
5
4
3
2
1
0
L
PARITY
GENERATOR
FORCE PIN
DIRECTION
(OUT)
TRANSMITTER
CONTROL LOGIC
6
15
SCCR1 (CONTROL REGISTER 1)
0
15
SCSR (STATUS REGISTER)
0
TDRE
TC
SCI Rx
REQUESTS
SCI INTERRUPT
REQUEST
INTERNAL
DATA BUS
68300 SCI TX BLOCK
Figure 6-7 SCI Transmitter Block Diagram
MC68331
QUEUED SERIAL MODULE
MOTOROLA
6-23
USER’S MANUAL