mc68hc908qb4 Freescale Semiconductor, Inc, mc68hc908qb4 Datasheet - Page 112
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mc68hc908qb4
Manufacturer Part Number
mc68hc908qb4
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908QB4.pdf
(236 pages)
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Enhanced Serial Communications Interface (ESCI) Module
13.3.1 Data Format
The SCI uses the standard mark/space non-return-to-zero (NRZ) format illustrated in
13.3.2 Transmitter
Figure 13-4
112
BUS CLOCK
BUSCLKX4
OR
shows the structure of the SCI transmitter.
PSSB4
PSSB3
PSSB2
PSSB1
PSSB0
PDS2
PDS1
PDS0
SCP1
SCP0
SCR2
SCR1
SCR0
÷
INTERRUPT REQUEST
START
4
START
TRANSMITTER
BIT
BIT
BIT 0
BIT 0
SCALER
PRE-
BIT 1
BIT 1
DIVIDER
BAUD
PEN
PTY
BIT 2
BIT 2
Figure 13-3. SCI Data Formats
Figure 13-4. ESCI Transmitter
TXINV
MC68HC908QB8 Data Sheet, Rev. 2
BIT 3
BIT 3
÷
(BIT M IN SCC1 CLEAR)
9-BIT DATA FORMAT
(BIT M IN SCC1 SET)
GENERATION
8-BIT DATA FORMAT
16
PARITY
SCTE
SCTIE
TC
TCIE
BIT 4
BIT 4
T8
M
STOP
BIT 5
BIT 5
8
BIT 6
BIT 6
SCTIE
7
SCTE
TCIE
TC
ESCI DATA REGISTER
6
OR DATA
SHIFT REGISTER
PARITY
INTERNAL BUS
BIT 7
BIT 7
BIT
TRANSMIT
5
11-BIT
4
CONTROL LOGIC
OR DATA
PARITY
TRANSMITTER
STOP
BIT 8
BIT
BIT
3
2
START
NEXT
STOP
BIT
BIT
1
LOOPS
ENSCI
LINT
SBK
TE
0
START
NEXT
BIT
START
Freescale Semiconductor
Figure
13-3.
SCI_TxD
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