h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 512
h8s-2169
Manufacturer Part Number
h8s-2169
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2169.pdf
(1075 pages)
- Current page: 512 of 1075
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Section 15 Serial Communication Interface (SCI, IrDA)
15.3.5
Figure 15.21 shows a block diagram of the IrDA function.
When the IrDA function is enabled with bit IrE in KBCOMP, the SCI channel 2 TxD2 and RxD2
signals are subjected to waveform encoding/decoding conforming to IrDA specification version
1.0 (IrTxD and IrRxD pins). By connecting these pins to an infrared transceiver/receiver, it is
possible to implement infrared transmission/reception conforming to the IrDA specification
version 1.0 system.
In the IrDA specification version 1.0 system, communication is started at a transfer rate of 9600
bps, and subsequently the transfer rate can be varied as necessary. As the IrDA interface in the
H8S/2169 or H8S/2149 does not include a function for varying the transfer rate automatically, the
transfer rate setting must be changed by software.
Transmission: In transmission, the output signal (UART frame) from the SCI is converted to an
IR frame by the IrDA interface (see figure 15.22).
When the serial data is 0, a high-level pulses 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 KBCOMP.
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
Rev. 3.00 Jan 18, 2006 page 484 of 1044
REJ09B0280-0300
IrDA Operation
TxD2/IrTxD
RxD2/IrRxD
bit rate) + 1.08 µs.
Figure 15.21 Block Diagram of IrDA Function
Pulse encoder
Pulse decoder
KBCOMP
IrDA
RxD
TxD
SCI2
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