Datasheet

Chapter 12 Serial Communications Interface (S08SCIV3)
MC9S08LC60 Series Data Sheet: Technical Data, Rev. 4
Freescale Semiconductor 217
12.1.3 Block Diagram
Figure 12-3 shows the transmitter portion of the SCI. (Figure 12-4 shows the receiver portion of the SCI.)
Figure 12-3. SCI Transmitter Block Diagram
H 8 7 6 5 4 3 2 1 0 L
SCID – Tx BUFFER
(WRITE-ONLY)
INTERNAL BUS
STOP
11-BIT TRANSMIT SHIFT REGISTER
START
SHIFT DIRECTION
LSB
1 × BAUD
RATE CLOCK
PARITY
GENERATION
TRANSMIT CONTROL
SHIFT ENABLE
PREAMBLE (ALL 1s)
BREAK (ALL 0s)
SCI CONTROLS TxD
TxD DIRECTION
TO TxD
PIN LOGIC
LOOP
CONTROL
TO RECEIVE
DATA IN
TO TxD PIN
Tx INTERRUPT
REQUEST
LOOPS
RSRC
TIE
TC
TDRE
M
PT
PE
TCIE
TE
SBK
T8
TXDIR
LOAD FROM SCID
TXINV
BRK13