HD6432633 Datasheet, PDF (808/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

When the value of the serial data is “1”, no pulse is output.
Start
bit
UART frame
Data
Start
bit
0
10
1
00
110
1
Transmitting
Receiving
Start
bit
01
IR frame
Data
01
0 01 1
Start
bit
01
Bit
cycle
Pulse width = 1.6 µs to
3/16ths 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