h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 502

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 15 Serial Communication Interface (SCI, IrDA)
The high-level pulse width is fixed at a minimum of 1.41 µs, and a maximum of (3/16 + 2.5%)
bit rate or (3/16
minimum high-level pulse width at 1.41 µs or above.
When the serial data is 1, no pulse is output.
Reception: In reception, IR frame data is converted to a UART frame by the IrDA interface, and
input to the SCI.
When a high-level 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-Level Pulse Width Selection: Table 15.12 shows possible settings for bits IrCKS2 to
IrCKS0 (minimum pulse width), and H8S/2138 Group and H8S/2134 Group operating frequencies
and bit rates, for making the pulse width shorter than 3/16 times the bit rate in transmission.
Rev. 4.00 Jun 06, 2006 page 448 of 1004
REJ09B0301-0400
Transmission
Bit
interval
Start
Start
bit rate) + 1.08 µs. When system clock is 20 MHz, 1.6 µs can be set as the
bit
bit
0
0
Figure 15.22 IrDA Transmit/Receive Operations
1
1
0
0
UART frame
IR frame
1
1
0
0
Data
Data
0
0
1
1
Reception
Pulse width is 1.6 µs
to 3/16 bit interval
1
1
0
0
Stop
Stop
bit
bit
1
1