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When the value of the serial data is "1", no pulse is output.
Start
bit
Transmitting
Start
bit
Bit
cycle
(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.
646
UART frame
0
1
0
IR frame
0
1
0
Figure 16-22 IrDA Transmit and Receive Operations
Data
1
0
0
Data
1
0
0
Start
1
1
0
Receiving
Start
1
1
0
Pulse width = 1.6 µs to
3/16ths bit cycle
bit
1
bit
1
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