R01UH0823EJ0100 Rev.1.00
Page 1111 of 1823
Jul 31, 2019
RX23W Group
34. IrDA Interface
34.3.2
Reception
In reception, the IR frame data is converted to the UART frame data through the IrDA interface and is input to the SCI5.
Low-level data is input when the IRCR.IRRXINV bit is 0 and a high-level pulse is detected; high-level data is input
when no pulse is detected for a 1-bit period.
34.3.3
Selecting High-Level Pulse Width
The IRCKS[2:0] bits need to be set to encode waveforms that meet the IrDA standard (the minimum pulse width should
be 1.41 μs and the maximum should be the bit period × (3/16 + 2.5%) or (the bit period × 3/16) + 1.08 μs).
The default value of the IRCKS[2:0] bits is 000b (the bit period × 3/16).
lists IRCKS[2:0] bit settings and the
corresponding operating frequencies and bit rates of this module, which can be used when setting the pulse width shorter
than the default value.
Note 1. Bit rates cannot be set for the IrDA interface. For details on bit rate settings, section 33, Serial Communications Interface (SCIg,
Note 2. A pulse width which is less than the bit period × 3/16 cannot be set. Set the IRCKS[2:0] bits to 000b.
Table 34.2
IRCKS[2:0] Bit Settings (When setting the pulse width shorter than IRCKS[2:0] = 000b (the bit
period × 3/16))
Peripheral Module
Operating
Frequency PCLK
(MHz)
Bit Rate (bps) (Upper Row)/Bit Period × 3/16 (μs) (Lower Row)*
2400
9600
19200
38400
57600
115200
78.13
19.53
9.77
4.88
3.26
1.63
4.9152
011b-111b
011b-110b
011b-101b
011b-100b
011b-100b
011b
5
011b-111b
011b-110b
011b-101b
011b-100b
011b-100b
011b
6
100b-111b
100b-110b
100b-101b
100b
100b
—*
6.144
100b-111b
100b-110b
100b-101b
100b
100b
—*
7.3728
100b-111b
100b-110b
100b-101b
100b-101b
100b
8
100b-111b
100b-111b
100b-110b
100b-101b
100b
9.8304
100b-111b
100b-111b
100b-110b
100b-101b
100b-101b
100b
10
100b-111b
100b-111b
100b-110b
100b-101b
100b-101b
100b
12
101b-111b
101b-111b
101b-110b
101b
101b
—*
12.288
101b-111b
101b-111b
101b-110b
101b
101b
—*
14
101b-111b
101b-111b
101b-111b
101b-110b
101b
14.7456
101b-111b
101b-111b
101b-111b
101b-110b
101b
16
101b-111b
101b-111b
101b-111b
101b-110b
101b
16.9344
101b-111b
101b-111b
101b-111b
101b-110b
101b
17.2032
101b-111b
101b-111b
101b-111b
101b-110b
101b
18
101b-111b
101b-111b
101b-111b
101b-110b
101b
19.6608
101b-111b
101b-111b
101b-111b
101b-110b
101b-110b
101b
20
101b-111b
101b-111b
101b-111b
101b-110b
101b-110b
101b
25
110b-111b
110b-111b
110b-111b
110b
110b