Datasheet

Chapter 8 Serial Communication Interface (SCIV3)
MC9S12E128 Data Sheet, Rev. 1.07
260 Freescale Semiconductor
Figure 8-12. SCI Data Formats
Each data character is contained in a frame that includes a start bit, eight or nine data bits, and a stop bit.
Clearing the M bit in SCI control register 1 configures the SCI for 8-bit data characters. A frame with eight
data bits has a total of 10 bits. Setting the M bit configures the SCI for nine-bit data characters. A frame
with nine data bits has a total of 11 bits
When the SCI is configured for 9-bit data characters, the ninth data bit is the T8 bit in SCI data register
high (SCIDRH). It remains unchanged after transmission and can be used repeatedly without rewriting it.
A frame with nine data bits has a total of 11 bits.
Table 8-12. Example of 9-Bit Data Formats
Table 8-11. Example of 8-bit Data Formats
Start
Bit
Data
Bits
Address
Bits
Parity
Bits
Stop
Bit
18001
17011
17 1
1
1
The address bit identifies the frame as an address
character. See Section 8.4.5.6, “Receiver Wakeup”.
01
Start
Bit
Data
Bits
Address
Bits
Parity
Bits
Stop
Bit
19001
18011
18 1
1
1
The address bit identifies the frame as an address
character. See Section 8.4.5.6, “Receiver Wakeup”.
01
BIT 5
START
BIT
BIT 0 BIT 1
NEXT
STOP
BIT
START
BIT
8-BIT DATA FORMAT
(BIT M IN SCICR1 CLEAR)
START
BIT
BIT 0
NEXT
STOP
BIT
START
BIT
9-BIT DATA FORMAT
(BIT M IN SCICR1 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
POSSIBLE
PARITY
BIT
POSSIBLE
PARITY
BIT
STANDARD
SCI DATA
INFRARED
SCI DATA
STANDARD
SCI DATA
INFRARED
SCI DATA