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22.2.2 Modes of operation
See Section
Functional description
• 8- and 9-bit data modes
• Stop mode operation
• Loop mode
• Single-wire mode
22.2.3 Block diagram
The following figure shows the transmitter portion of the SCI.
Internal Bus
M
1x Baud Rate Clock
PE
PT
NXP Semiconductors
for details concerning SCI operation in these modes:
(Write-Only)
SCID – Tx Buffer
11-BIT Transmit Shift Register
H
8
7
6
SHIFT DIRECTION
T8
Parity
Generation
TE
SBK
Transmit Control
TXDIR
BRK13
Figure 22-1. SCI transmitter block diagram
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
Chapter 22 Serial Communications Interface (SCI)
LOOPS
RSRC
5
4
3
2
1
0
L
SCI Controls TxD
TDRE
TIE
TC
TCIE
Loop
To Receive
Control
Data In
To TxD Pin
TXINV
TO TxD
Pin Logic
TxD Direction
Tx Interrupt
Request
397
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