SH7721 datasheet(703/1524 Pages) RENESAS

703 / 1524 page

Section 19

Infrared Data Association Module (IrDA)

Rev. 3.00 Jan. 18, 2008 Page 641 of 1458

REJ09B0033-0300

Bit

Bit Name

Initial Value R/W

Description

6 to 3

ICK3 to ICK0

All 0

R/W

Output Pulse Division Ratio 3 to 0

∗

Specifies the ratio for dividing the peripheral

clock (P

φ) to generate the IRCLK clock pulse to

be used for IrDA. IRCLK is obtained as follows:

IRCLK = 1/(2N + 2)

× Pφ

N = Value set by ICK3 to ICK0

PSEL

R/W

Output Pulse Width Select

Selects an IrDA output pulse width that is 3/16 of

the bit length for 115 kbps or 3/16 of the bit

length for the selected baud rate.

0: Pulse width is 3/16 of the bit length

1: Pulse width is 3/16 of 115 kbps bit length for

the baud rate selected by ICK3 to ICK0

1, 0



All 0

Reserved

These bits are always read as 0. The write value

should always be 0.

Note:

∗ Recommended value of IrDA

For example, when the transfer rate in 115.2kbps, set the value (Nb+1):(Ni+1) = 2:1.

Setting (Nb+1):(Ni+1) = 2:1 (115.2 kbps) allows operation in synchronization while the

SCIF module and IrDA module perform asynchronous operation. Synchronous

operation equalizes errors in the IR frame when such bit rate errors occur. Use bit 2

(PSEL) in SCIMR as PSEL = 1 to adjust transfer and receive data.

[Legend]

Nb:

The baud rate value in SCIF (SCBRD7 to SCBRD0 in SCBRR)

Ni :

The baud rate value in IrDA (ICK3 to ICK0 in SCIMR)

B :

Bit rate (bits/s)

Setting Example as P

φ =33.1776MHz:

Nb+1

Ni+1

115.2

57.6

38.4

107

108

19.2

215

2196

9.6

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