MC68711E20CFNE3 Datasheet, PDF (106/242 Pages) –

Serial Communications Interface (SCI)
TRANSMITTER
BAUD RATE
CLOCK
SCDR Tx BUFFER
WRITE ONLY
10 (11) - BIT Tx SHIFT REGISTER
H (8) 7 6 5 4 3 2 1 0 L
DDD1
PIN BUFFER
AND CONTROL
8
SEE NOTE
PD1
TxD
SCCR1 SCI CONTROL 1
TRANSMITTER
CONTROL LOGIC
FORCE PIN
DIRECTION (OUT)
SCSR INTERRUPT STATUS
TDRE
TIE
TC
TCIE
8
8
SCCR2 SCI CONTROL 2
SCI Rx
REQUESTS
SCI INTERRUPT
REQUEST
INTERNAL
DATA BUS
Note: Refer to Figure B-1. EVBU Schematic Diagram for an example of connecting TxD to a PC.
Figure 7-1. SCI Transmitter Block Diagram
M68HC11E Family Data Sheet, Rev. 5.1
106
Freescale Semiconductor