MC68331
USER’S MANUAL
QUEUED SERIAL MODULE
MOTOROLA
6-23
6
Figure 6-7 SCI Transmitter Block Diagram
68300 SCI TX BLOCK
0
L
W
I
P
P
M
W
T
T
R
I
T
R
R
S
TRANSMITTER
CONTROL LOGIC
PIN BUFFER
AND CONTROL
H (8) 7
6
5
4
3
2
1
0
L
MDDR7
MDDR5
TxD
SCDR Tx BUFFER
T
S
J
P
B
(WRITE-ONLY)
FORCE PIN
DIRECTION
(OUT)
S
PARITY
GENERATOR
TRANSMITTER
BAUD RATE
CLOCK
TC
TDRE
SCI Rx
REQUESTS
SCI INTERRUPT
REQUEST
F
N
O
I
R
T
T
SCSR (STATUS REGISTER)
P
INTERNAL
DATA BUS
R
T
T
SCCR1 (CONTROL REGISTER 1)
0
15
15
0
S
S
O
10 (11) - BIT
Tx SHIFT REGISTER
