TIR2000 datasheet(47/63 Pages) TI

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4–11

Bit definitions:

BIT NO.

DESCRIPTIONS

Bit 0~1: Transmitter modulation mode.

00: C_PLS modulation mode

01: 8_PLS modulation mode

10: 6_PLS modulation mode

11: Reserved

TX High–speed carrier frequency select

0: 30–56KHz

1: 400–500KHz

Receiver internal demodulation disabled.

0: enabled

1: disabled

RX High–speed carrier frequency select

0: 30–56KHz

1: 400–500KHz

RX sampling mode

0: Programmed T-period

1: Oversampled mode

The oversampled mode is used to catch the snapshot of an incoming signal so as to determine the period

of the carrier signal. The programmed T-period mode is used to receive data at a lower sampling rate

(compared to “oversampled” mode) which matches the bit rate of incoming signal. Thus programmed

T-period reduces the amount of data used to represent the incoming signal. In normal operation, the

“programmed T-period” mode should be chosen.

Run length encoding/decoding enable

0: disabled

1: enabled

1: Indicate the RX is active

0: RX is inactive

Bit 7 is automatically set when valid infrared pulses are detected

4.12.2

TV Demodulation Configuration Register (TVDMCFG)

Address: B (Hex) – Bank 1

Bit No.

[7–6]

[5–4]

[3–0]

Description

Not used

Delta frequency

Center frequency

Default

0000

Table 4–1. RX Demodulation Carrier Frequency (low range TVCFG[4] bit = 0)

TVDMCFG [3–0]

3 2 1 0

TVDMCFG [5–4] = 00

TVDMCFG [5–4] = 01

TVDMCFG [5–4] = 10

TVDMCFG [5–4] = 11

0000

±2

±4

±6

±8

0001

±2

±4

±6

±10

0010

±2

±5

±8

±10

0011

±2

±5

±10

±15

0100

±2

±8

±15

±20

0101

±2

±8

±15

±20

0110

±2

±8

±15

±20

0111

±2

±10

±15

±25

(Freq. In kHz)

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