mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 415

• Manufacturer Part Number: mc9s12xs128
• Description: Hcs12 Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

14.4.3
The SCI uses the standard NRZ mark/space data format. When Infrared is enabled, the SCI uses RZI data
format where zeroes are represented by light pulses and ones remain low. See
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.
Freescale Semiconductor
Start
Start
Bit
Bit
Data Format
Bit 0
Bit 0
Bit 1
Bit 1
1
Bit 2
Bit 2
Start
Start
The address bit identifies the frame as an address
character. See
Bit
Bit
1
1
1
1
1
1
Table 14-14. Example of 8-Bit Data Formats
Table 14-15. Example of 9-Bit Data Formats
S12XS Family Reference Manual, Rev. 1.10
Bit 3
Bit 3
(Bit M in SCICR1 Clear)
Figure 14-15. SCI Data Formats
(Bit M in SCICR1 Set)
Data
Data
Bits
Bits
8-Bit Data Format
9-Bit Data Format
8
7
7
9
8
8
Bit 4
Bit 4
Section 14.4.6.6, “Receiver
Address
Address
Bit 5
Bit 5
Bits
Bits
1
1
0
0
0
0
1
1
Bit 6
Bit 6
Parity
Parity
Bits
Bits
Possible
0
1
0
0
1
0
Parity
Bit 7
Bit 7
Bit
Wakeup”.
POSSIBLE
PARITY
STOP
Bit 8
Bit
Bit
Stop
Stop
Serial Communication Interface (S12SCIV5)
Bit
Bit
1
1
1
1
1
1
STOP
Start
Next
Bit
Bit
Figure 14-15
START
NEXT
Bit
below.
Standard
SCI Data
Infrared
SCI Data
Standard
SCI Data
Infrared
SCI Data
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