MC68711E20CFNE3 Datasheet, PDF (108/242 Pages) –

Serial Communications Interface (SCI)
RECEIVER
BAUD RATE
CLOCK
SEE NOTE
PD0
RxD
DDD0
÷16
PIN BUFFER
AND CONTROL
DATA
RECOVERY
DISABLE
DRIVER
RE
10 (11) - BIT
Rx SHIFT REGISTER
(8) 7 6 5 4 3 2 1 0
MSB
ALL 1s
M
WAKEUP
LOGIC
RWU
8
SCCR1 SCI CONTROL 1
SCSR SCI STATUS 1
RDRF
RIE
IDLE
ILIE
OR
RIE
SCDR Rx BUFFER
READ ONLY
8
8
SCCR2 SCI CONTROL 2
SCI Tx
REQUESTS
SCI INTERRUPT
REQUEST
INTERNAL
DATA BUS
Note: Refer to Figure B-1. EVBU Schematic Diagram for an example of connecting RxD to a PC.
Figure 7-2. SCI Receiver Block Diagram
M68HC11E Family Data Sheet, Rev. 5.1
108
Freescale Semiconductor