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When the value of the serial data is "1", no pulse is output.
Start
bit
0
Transmitting
Start
bit
Bit
cycle
Figure 16-22 IrDA Transmit and Receive Operations
(2) Receiving
When receiving, the IR frame data is converted into UART frames by the IrDA interface and input
to the SCI.
When a High pulse is detected, "0" is output. If there is no pulse for the duration of 1 bit, "1" is
output. Pulses of less than the minimum pulse width of 1.41 µs are also recognized as "0" data.
(3) Selecting High Pulse Width
Table 16-12 shows the settings of IrCKS2 to IrCKS0 (for the minimum pulse width), at various
LSI operating frequencies, and various bit rates to set the pulse width when transmitting with a
pulse width less than 3/16ths of the bit rate.
754
UART frame
1
0
1
IR frame
0
1
0
1
Data
0
0
1
1
Receiving
Data
0
0
1
1
Pulse width = 1.6 µs to
3/16ths bit cycle
Start
bit
0
1
Start
bit
0
1
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