Serial Communications Interface Module (SCI)
Functional Description
MC68HC908AB32 — Rev. 1.0 Technical Data
MOTOROLA Serial Communications Interface Module (SCI) 245
15.5.1 Data Format
The SCI uses the standard non-return-to-zero mark/space data format
illustrated in Figure 15-3.
Figure 15-3. SCI Data Formats
15.5.2 Transmitter
Figure 15-4 shows the structure of the SCI transmitter.
BIT 5
START
BIT
BIT 0 BIT 1
NEXT
STOP
BIT
START
BIT
8-BIT DATA FORMAT
BIT M IN SCC1 CLEAR
START
BIT
BIT 0
NEXT
STOP
BIT
START
BIT
9-BIT DATA FORMAT
BIT M IN SCC1 SET
BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8
BIT 2 BIT 3 BIT 4 BIT 6 BIT 7
PARITY
BIT
PARITY
BIT
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