mc68hc908ap8a Freescale Semiconductor, Inc, mc68hc908ap8a Datasheet - Page 154

• Manufacturer Part Number: mc68hc908ap8a
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Serial Communications Interface Module (SCI)
11.4.1 Data Format
The SCI uses the standard non-return-to-zero mark/space data format illustrated in
11.4.2 Transmitter
Figure 11-4
The baud rate clock source for the SCI can be selected via the configuration bit, SCIBDSRC. Source
selection values are shown in
154
CGMXCLK
IT12
SL = 0 => X = A
SL = 1 => X = B
SCIBDSRC
CONFIG2
A
B
FROM
SL
shows the structure of the SCI transmitter.
X
START
START
BIT
BIT
BIT 0
BIT 0
SCP1
SCP0
SCR1
SCR2
SCR0
÷ 4
BIT 1
BIT 1
Figure
SCALER
PRE-
MC68HC908AP A-Family Data Sheet, Rev. 3
BIT 2
BIT 2
Figure 11-3. SCI Data Formats
Figure 11-4. SCI Transmitter
11-4.
DIVIDER
BAUD
BIT 3
BIT 3
PEN
PTY
BIT M IN SCC1 CLEAR
8-BIT DATA FORMAT
9-BIT DATA FORMAT
TXINV
BIT M IN SCC1 SET
BIT 4
BIT 4
÷ 16
GENERATION
PARITY
DMATE
BIT 5
BIT 5
DMATE
SCTIE
SCTE
DMATE
SCTE
SCTIE
TC
TCIE
T8
M
BIT 6
BIT 6
H
8
PARITY
SCTIE
7
SCTE
BIT 7
BIT 7
TCIE
BIT
TC
SCI DATA REGISTER
6
SHIFT REGISTER
INTERNAL BUS
TRANSMIT
PARITY
5
STOP
BIT 8
BIT
BIT
11-BIT
CONTROL LOGIC
4
TRANSMITTER
3
START
STOP
NEXT
BIT
BIT
2
1
START
LOOPS
NEXT
ENSCI
BIT
SBK
TE
Freescale Semiconductor
0
Figure
L
11-3.
TxD