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Communication Processor Module
16.9.20.1 LOW-SPEED IRDA PROTOCOL. The low-speed IrDA protocol consists of a
data link layer and a physical layer.
• The data link layer is based on a preexisting ASYNC HDLC protocol standard. See
Section 16.9.19 The SCCx in Asynchronous HDLC Mode for more details. 0xC0 is
used as a start flag and 0xC1 is used as an end flag. Each character is compromised
out of a start bit, 8 data bits, no parity bit and ending with a stop bit, as shown in
Figure 16-94.
• The physical layer defines the electrical parameters of the signals between the
encoder/decoder module and the infrared transducer module. The signal waveform is
shown in Figure 16-94. For all signaling rates up to and including 115.2Kb/s, the
minimum pulse duration is the same—
(minus a protocol-defined tolerance). The maximum pulse duration is
duration (plus a protocol-defined tolerance).
START
BIT
0
(A)
(B)
16-288
3
UART FRAME
DATA BITS
1
0
1
0
INFRA- RED FRAME
Figure 16-94. Low-Speed IrDA Data Format
MPC823e REFERENCE MANUAL
/
of the bit duration for the 115.2Kb/s signal
16
0
1
1
3/16 BIT TIME
3
/
of the bit
16
STOP
BIT
0
1
MOTOROLA
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