TIR2000 datasheet(22/63 Pages) TI

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2–10

Program the mode-definition register (MDR) in order to:

•

Select the SHARP Ir mode

•

Enable/disable the low-power mode. For normal operation, the low-power mode is enabled.

•

Enable/disable the sleep mode. For normal operation, the sleep mode is disabled.

Program the TV configuration (TVCFG) register in order to:

•

Enable/disable the receiver internal demodulation.

•

Select the transmission carrier-frequency range.

•

Select the receiver carrier-frequency range.

2.1.4.1

SHARP IR Data-Transmission Mode

The following register programming steps are required for data transmission in the SHARP IR mode:

Program the PLR to select the TX FIFO trigger level.

Reset the TX FIFO. This includes the following:

•

Write to the LCR register to set the LCR[7] bit to a 1. The LCR[7] bit must be a 1 to be able to

write to the FCR(5) bit.

•

Program the FCR register to select 64-/16-bytes TX FIFO, non-DMA mode of operation,

select the RX FIFO trigger level and to clear the TX FIFO.

•

Write the LCR register so that the LCR[7] bit = 0 (for normal operation).

Program the IER register to enable only the data-transmission related interrupts.

•

Enable the transmit threshold interrupt.

•

Enable the transmit underrun interrupt.

•

Disable the RX FIFO over threshold interrupt.

•

Disable the RX FIFO overrun error interrupt.

Program the transmit modulation carrier-frequency register (TVMDCFG) to select the desired

carrier frequency and pulse duration.

Write a 1 to the ACREG[7] bit to enable data transmission.

Write a 1 to the MCR[3] bit to enable the selected IRQ channel.

This completes the programming of registers and now the device is ready for data transmission.

2.1.4.2

SHARP Infrared Data-Receive Mode

The following register programming steps are required for data receive in the SHARP infrared mode:

Program the infrared-configuration register (IRCFG). Select the SHARP infrared data-receive

terminal to be either IRRVL (IRCFG[1] = 1) or IRRVH (IRCFG[1] = 0).

Program the RX demodulation configuration register (TVDMCFG). Select the desired incoming

infrared data carrier frequency range.

Reset the RX FIFO. This includes:

•

Write to the LCR register to set the LCR[7] bit to a 1. The LCR[7] bit must be a 1 to be able to

write to the FCR(5) bit.

•

Program the FCR to select 64-/16-bytes TX FIFO, non-DMA mode of operation, select the

RX FIFO trigger level and to clear the TX FIFO.

TIR2000 데이터시트(PDF) 22 Page - Texas Instruments

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