r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 937

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

(1)
In transmission, the output signal (UART frame) from the SCI is converted to an IR frame by the
IrDA interface (see figure 15.34).
When the serial data is 0, a high pulse of 3/16 the bit rate (interval equivalent to the width of one
bit) is output (initial value). The high-level pulse can be varied according to the setting of bits
IrCKS2 to IrCKS0 in IrCR.
In the specification, the high pulse width is fixed at a minimum of 1.41 µs, and a maximum of
(3/16 + 2.5%) × bit rate or (3/16 × bit rate) + 1.08 µs. When system clock φ is 20 MHz, 1.6 µs can
be set for a high pulse width with a minimum value of 1.41 µs.
When the serial data is 1, no pulse is output.
Transmission
Start
Start
cycle
bit
bit
Bit
0
Transmit
0
Figure 15.34 IrDA Transmit/Receive Operations
1
1
0
0
UART frame
IR frame
1
1
0
Section 15 Serial Communication Interface (SCI, IrDA)
0
Data
Data
0
0
Rev. 1.00 Sep. 19, 2008 Page 909 of 1270
Receive
1
1
Pulse width
1.6 µs to 3/16 bit cycle
1
1
0
0
Stop
Stop
REJ09B0466-0100
bit
bit
1
1