M68HC11K_13 Datasheet, PDF (152/290 Pages) Freescale Semiconductor, Inc – M68HC11K Family Technical Data

Freescale Semiconductor, Inc.
Serial Communications Interface (SCI)
Figure 7-2 is a block diagram of the SCI transmitter.
TRANSMITTER
BAUD RATE
CLOCK
SCDR Tx BUFFER
WRITE ONLY
10 (11) — BIT Tx SHIFT REGISTER
H8 7 6 5 4 3 2 1 0 L
DDD1⁽¹⁾
PIN BUFFER
PD1
AND CONTROL
TxD
PARITY
GENERATOR
TRANSMITTER
CONTROL LOGIC
FORCE PIN
DIRECTION (OUT)
TE
SCCR1 SCI CONTROL 1
SCSR1 SCI STATUS 1
TDRE
TIE
TC
TCIE
SCCR2 SCI CONTROL 2
SCI Rx
REQUESTS
SCI INTERRUPT
REQUEST
Note 1. Data direction register for port D
INTERNAL
DATA BUS
Figure 7-2. SCI Transmitter Block Diagram
Technical Data
152
Serial Communications Interface (SCI)
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M68HC11K Family
MOTOROLA