RECEIVER
BAUD RATE
CLOCK
÷16
10 (11) - BIT
Rx SHIFT REGISTER
DATA
RECOVERY
RxD
PIN BUFFER
H (8)
7
6
5
4
3
2
1
0 L
MSB
ALL ONES
PARITY
DETECT
WAKEUP
LOGIC
15
SCCR1 (CONTROL REGISTER 1)
0
6
SCDR Rx BUFFER
(READ-ONLY)
15
SCSR (STATUS REGISTER)
0
SCI Tx
REQUESTS
SCI INTERRUPT
REQUEST
INTERNAL
DATA BUS
68300 SCI RX BLOCK
Figure 6-8 SCI Receiver Block Diagram
MOTOROLA
6-24
QUEUED SERIAL MODULE
MC68331
USER’S MANUAL