MMC2107 Datasheet, PDF (352/618 Pages) –

Freescale Semiconductor, Inc.
Serial Communications Interface Modules (SCI1 and SCI2)
16.11.1 Frame Length
The transmitter can generate either 10-bit or 11-bit frames. In SCICR1,
the M bit selects frame length, and the PE bit enables the parity function.
One data bit may be an address mark or an extra stop bit. All frames
begin with a start bit and end with one or two stop bits. When transmitting
9-bit data, bit T8 in SCI data register high (SCIDRH) is the ninth bit
(bit 8).
Table 16-5. Example 10-Bit and 11-Bit Frames
M Bit
Frame
Length
Start
Bit
Data
Bits
Parity
Bit
Address
Mark⁽¹⁾
Stop
Bit(s)
1
8
No
No
1
1
7
No
No
2
0
10 bits
1
7
No
Yes
1
1
7
Yes
No
1
1
9
No
No
1
1
8
No
No
2
1
8
No
Yes
1
1
11 bits
1
8
Yes
No
1
1
7
No
Yes
2
1
7
Yes
No
2
1. When implementing a multidrop network using the SCI, the address mark bit is used to
designate subsequent data frames as a network address and not device data.
Technical Data
352
Serial Communications Interface Modules (SCI1 and SCI2)
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MMC2107 – Rev. 2.0
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