MC9S08SG8 Datasheet, PDF (201/310 Pages) Freescale Semiconductor, Inc – Microcontrollers

14.1.3 Block Diagram
Figure 14-2 shows the transmitter portion of the SCI.
INTERNAL BUS
Serial Communications Interface (S08SCIV4)
(WRITE-ONLY)
SCID – Tx BUFFER
LOOPS
RSRC
M
11-BIT TRANSMIT SHIFT REGISTER
LOOP
CONTROL
TO RECEIVE
DATA IN
1 × BAUD
RATE CLOCK
H876543210L
SHIFT DIRECTION
TXINV
TO TxD PIN
T8
PE
PARITY
PT
GENERATION
TE
SBK
TXDIR
BRK13
TRANSMIT CONTROL
SCI CONTROLS TxD
TxD DIRECTION
TO TxD
PIN LOGIC
TDRE
TIE
TC
TCIE
Figure 14-2. SCI Transmitter Block Diagram
Tx INTERRUPT
REQUEST
MC9S08SG8 MCU Series Data Sheet, Rev. 0
Freescale Semiconductor
201