III PERIPHERAL BLOCK: SERIAL INTERFACE

Selecting the IrDA interface function

To use the IrDA interface function, select it using the control bits shown below and then set the 8-bit (or 7- bit) asynchronous mode as the transfer mode.

Ch.0 IrDA interface-function selection: IRMD0[1:0] (D[1:0]) / Serial I/F Ch.0 IrDA register (0x401E4)

Ch.1 IrDA interface-function selection: IRMD1[1:0] (D[1:0]) / Serial I/F Ch.1 IrDA register (0x401E9)

Ch.2 IrDA interface-function selection: IRMD2[1:0] (D[1:0]) / Serial I/F Ch.2 IrDA register (0x401F4)

Ch.3 IrDA interface-function selection: IRMD3[1:0] (D[1:0]) / Serial I/F Ch.3 IrDA register (0x401F9)

Table 8.7 Setting of IrDA Interface

IRMDx1

IRMDx0

Interface mode

1

1

Do not set. (reserved)

1

0

IrDA 1.0 interface

0

1

Do not set. (reserved)

0

0

Normal interface

Note: The IRMDx bit becomes indeterminate when initially reset, so be sure to initialize it in the software.

Setting the input/output logic

When using the IrDA interface, the logic of the input/output signals of the PPM modulator circuit can be changed in accordance with the infrared-ray communication module or the circuit connected externally to the chip. The logic of the internal serial interface is "active-low". If the input/output signals are active-high, the logic of these signals must be inverted before they can be used. The input SINx and output SOUTx logic can be set individually through the use of the IRRLx and IRTLx bits, respectively.

 

Table 8.8

IrDA Input/Output Logic Inversion Bits

 

 

Ch.0 (Serial I/F Ch.0

Ch.1 (Serial I/F Ch.1

Ch.2 (Serial I/F Ch.2

Ch.3 (Serial I/F Ch.3

 

control register)

control register)

control register)

control register)

IrDA input logic

IRRL0(D2/0x401E4)

IRRL1(D2/0x401E9)

IRRL2(D2/0x401F4)

IRRL3(D2/0x401F9)

inversion

 

 

 

 

IrDA output logic

IRTL0(D3/0x401E4)

IRTL1(D3/0x401E9)

IRTL2(D3/0x401F4)

IRTL3(D3/0x401F9)

inversion

 

 

 

 

The logic of the input/output signal is inverted by writing "1" to each corresponding bit. Logic is not inverted if the bit is set to "0".

When transmitting

(1) IRTLx = "0"

PPM modulator input (I/F output)

PPM modulator output (SOUTx)

(2) IRTLx = "1"

PPM modulator input (I/F output)

PPM modulator output (SOUTx)

When receiving

(1) IRRLx = "0"

PPM modulator input (SINx)

PPM modulator output (I/F input)

(2) IRRLx = "1"

PPM modulator input (SINx)

PPM modulator output (I/F input)

Figure 8.15 IRRLx and IRTLx Settings

Note: The IRRLx and IRTLx bits become indeterminate at initial reset, so be sure to initialize them in the software.

B-III-8-22

EPSON

S1C33L03 FUNCTION PART