Figure 14.34 Irda Transmit/Receive Operations - Renesas H8S/2368 Series Hardware Manual

When the serial data is 1, no pulse is output.
Start
bit
0
Transmit
Start
bit
Bit
cycle
Reception: In reception, IR frame data is converted to a UART frame by the IrDA interface, and
input to the SCI.
When a high pulse is detected, 0 data is output, and if there is no pulse during a one-bit interval, 1
data is output. Note that a pulse shorter than the minimum pulse width of 1.41 µs will be identified
as a 0 signal.
High Pulse Width Selection: Table 14.12 shows possible settings for bits IrCKS2 to IrCKS0
(minimum pulse width), and operating frequencies of this LSI and bit rates, for making the pulse
width shorter than 3/16 times the bit rate in transmission.
Rev. 2.00, 05/03, page 578 of 820
UART frame
1 0 1
IR frame
0 1 0 1

Figure 14.34 IrDA Transmit/Receive Operations

Data
0 0 1
Receive
Data
0 0 1
Pulse width
1.6 µs to 3/16 bit cycle
Stop
bit
1 0 1
Stop
bit
1 0 1