Block Diagram - ROHS MC9S08QE128 Reference Manual

14.1.5

Block Diagram

Figure 14-3 shows the transmitter portion of the SCI.
INTERNAL BUS
1 × BAUD
RATE CLOCK
PE
PT
Freescale Semiconductor
(WRITE-ONLY)
11-BIT TRANSMIT SHIFT REGISTER
M
H 8 7
T8
PARITY
GENERATION
TE
SBK
TXDIR
BRK13
Figure 14-3. SCI Transmitter Block Diagram
MC9S08QE128 MCU Series Reference Manual, Rev. 2
SCID – Tx BUFFER
6 5 4 3 2 1 0 L
SHIFT DIRECTION
TRANSMIT CONTROL
TDRE
TIE
TC
TCIE
Serial Communications Interface (S08SCIV4)
LOOPS
RSRC
LOOP
TO RECEIVE
CONTROL
DATA IN
TO TxD PIN
TXINV
SCI CONTROLS TxD
TO TxD
PIN LOGIC
TxD DIRECTION
Tx INTERRUPT
REQUEST
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