IRCC datasheet(11/79 Pages) SMSC

11 / 79 page

Bit Rate Divider

The Transmit and Receive Bit Rate Divider

stream for the IrCC SCE. The divider is eight bits

wide.

The input clock to the Bit Rate Divider is 100KHz

(Carrier Frequency Divider input clock

÷ 16).

The

relationship

between

the

Bit

Rate

Divider (BRD) and the Bit Rate (Fb) is as follows:

BRD = (.1MHz/Fb) - 1

For example, program the Bit Rate Divider with

55 ('37'Hex) for a .562ms TV Remote bit cell: Fb

= 1.786KHz. This is ~.5% accuracy. Table 10

contains representative BRD vs. Bit Rate

relationships. The Bit Rate range is 100KHz to

390.625Hz.

Table 10 - Representative Bit Rates

BRD

Fb (KHz)

BRD

Fb (KHz)

BRD

Fb (KHz)

BRD

Fb (KHz)

003

25.000

067

1.471

131

0.758

195

0.510

007

12.500

071

1.389

135

0.735

199

0.500

011

8.333

075

1.316

139

0.714

203

0.490

015

6.250

079

1.250

143

0.694

207

0.481

019

5.000

083

1.190

147

0.676

211

0.472

023

4.167

087

1.136

151

0.658

215

0.463

027

3.571

091

1.087

155

0.641

219

0.455

031

3.125

095

1.042

159

0.625

223

0.446

035

2.778

099

1.000

163

0.610

227

0.439

039

2.500

103

0.962

167

0.595

231

0.431

043

2.273

107

0.926

171

0.581

235

0.424

047

2.083

111

0.893

175

0.568

239

0.417

051

1.923

115

0.862

179

0.556

243

0.410

055

1.786

119

0.833

183

0.543

247

0.403

059

1.667

123

0.806

187

0.532

251

0.397

063

1.563

127

0.781

191

0.521

255

0.391

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