MC9S12Q FREESCALE [Freescale Semiconductor, Inc], MC9S12Q Datasheet - Page 391

• Manufacturer Part Number: MC9S12Q
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

13.4.1
The SCI uses the standard NRZ mark/space data format illustrated in
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
Data Format
START
START
BIT
BIT
1. The address bit identifies the frame as an address character. See
1. The address bit identifies the frame as an address character. See
BIT 0
BIT 0
Section 13.4.4.6, “Receiver
Section 13.4.4.6, “Receiver
Start
Start
Bit
Bit
1
1
1
1
1
1
BIT 1
BIT 1
Table 13-8. Example of 8-Bit Data Formats
Table 13-9. Example of 9-Bit Data Formats
Data
Data
BIT 2
BIT 2
Bits
Bits
Figure 13-10. SCI Data Formats
8
7
7
9
8
8
BIT 3
BIT 3
BIT M IN SCICR1 CLEAR
8-BIT DATA FORMAT
Chapter 13 Serial Communications Interface (S12SCIV2) Block Description
MC9S12Q128
BIT M IN SCICR1 SET
Address
Address
9-BIT DATA FORMAT
BIT 4
Wakeup”.
Wakeup”.
BIT 4
Bits
Bits
Rev 1.09
1
1
0
0
0
0
(1)
(1)
BIT 5
BIT 5
BIT 6
BIT 6
Parity
Parity
Bits
Bits
0
1
0
0
1
0
OR DATA
PARITY
BIT 7
BIT 7
BIT
Figure 13-10
OR DATA
PARITY
STOP
BIT 8
BIT
BIT
Stop
Stop
Bit
Bit
1
1
1
1
1
1
START
STOP
NEXT
BIT
BIT
START
below.
NEXT
BIT
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