MC908AZ32ACFUE Datasheet, PDF (142/324 Pages) Freescale Semiconductor, Inc – Microcontrollers

Serial Communications Interface (SCI)
16.4.1 Data Format
The SCI uses the standard non-return-to-zero mark/space data format illustrated in Figure 16-3.
8-BIT DATA FORMAT
(BIT M IN SCC1 CLEAR)
PARITY
OR DATA
BIT
NEXT
START
START
BIT BIT 0 BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 ^STOP BIT
BIT
START
9-BIT DATA FORMAT
(BIT M IN SCC1 SET)
PARITY
OR DATA
BIT
NEXT
START
BIT BIT 0 BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8 STOP BIT
BIT
Figure 16-3. SCI Data Formats
16.4.2 Transmitter
Figure 16-4 shows the structure of the SCI transmitter.
INTERNAL BUS
÷4
PRE- BAUD
SCALER DIVIDER
÷ 16
SCI DATA REGISTER
SCP1
SCP0
SCR1
SCR2
SCR0
11-BIT
TRANSMIT
SHIFT REGISTER
H876543210L
TxD
TXINV
M
PEN
PARITY
PTY
GENERATION
T8
TRANSMITTER
CONTROL LOGIC
SCTE
SCTE
SCTIE
TC
TCIE
SCTIE
TC
TCIE
Figure 16-4. SCI Transmitter
SBK
LOOPS
ENSCI
TE
MC68HC908AZ32A Data Sheet, Rev. 2
142
Freescale Semiconductor