MC9S08QG8_09 Datasheet, PDF (197/314 Pages) Freescale Semiconductor, Inc – HCS08 Microcontrollers

Serial Communications Interface (S08SCIV3)
14.1.3 Block Diagram
Figure 14-3 shows the transmitter portion of the SCI. (Figure 14-4 shows the receiver portion of the SCI.)
INTERNAL BUS
(WRITE-ONLY)
SCID – Tx BUFFER
LOOPS
RSRC
M
1 × BAUD
RATE CLOCK
11-BIT TRANSMIT SHIFT REGISTER
H876543210L
SHIFT DIRECTION
LOOP
CONTROL
TO RECEIVE
DATA IN
TO TxD PIN
T8
PE
PARITY
PT
GENERATION
TE
SBK
TXDIR
BRK13
TRANSMIT CONTROL
TXINV
SCI CONTROLS TxD
TxD DIRECTION
TO TxD
PIN LOGIC
TDRE
TIE
TC
TCIE
Figure 14-3. SCI Transmitter Block Diagram
Tx INTERRUPT
REQUEST
MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 5
Freescale Semiconductor
195