MC9S08GB60A Datasheet, PDF (174/302 Pages) Freescale Semiconductor, Inc – HCS08 Microcontrollers

Serial Communications Interface (S08SCIV1)
11.1.3 Block Diagram
Figure 11-2 shows the transmitter portion of the SCI. (Figure 11-3 shows the receiver portion of the SCI.)
INTERNAL BUS
M
1 × BAUD
RATE CLOCK
(WRITE-ONLY)
SCID – Tx BUFFER
LOOPS
RSRC
11-BIT TRANSMIT SHIFT REGISTER
H876543210L
SHIFT DIRECTION
LOOP
CONTROL
TO RECEIVE
DATA IN
TO TxD PIN
T8
PE
PARITY
PT
GENERATION
TE
ENABLE
SBK
TXDIR
TRANSMIT CONTROL
SCI CONTROLS TxD
TxD DIRECTION
TO TxD
PIN LOGIC
TDRE
TIE
TC
TCIE
Figure 11-2. SCI Transmitter Block Diagram
Tx INTERRUPT
REQUEST
MC9S08GB60A Data Sheet, Rev. 2
174
Freescale Semiconductor