CS5535 datasheet(398/555 Pages) NSC

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Revision 0.8

UART/IR Controller Register Descriptions (Continued)

5.12.10.5 IR Interface Configuration Register 1 (IRCFG1)

IRCFG1 holds the transceiver configuration data for Sharp_IR and SIR modes. It is also used to directly control the trans-

ceiver operation mode when automatic configuration is not enabled. The two next-to-least significant bits are used to read

the identification data of a plug-and-play IR interface adapter.

I/O Offset

04h

Type

R/W

Reset Value

xxh

IRCFG1 Register Map

STRV_MS

RSVD

SET_RTX

IRRX1_LV

RSVD

IRIC[2:0]

IRCFG1 Bit Descriptions

Bit

Name

Description

7STRV_MS

Special Transceiver Mode Selection. When this R/W bit is set to 1, the UART[x]_IR_TX

output signal is forced to active high and a timer is started. The timer times out after 64

micro-seconds, at which time the bit is reset and the UART[x]_IR_TX output signal

becomes low again. The timer is restarted every time a 1 is written to this bit. Although it

is possible to extend the period during which UART[x]_IR_TX remains high beyond 64

micro-seconds, this should be avoided to prevent damage to the transmitter LED. Writing

a 0 to this bit has no effect.

RSVD

Reserved. Write as 0.

SET_IRTX

Set IRTX. When this bit is set to 1, it forces the UART[x]_IR_TX signal high.

Caution: Indefinite HIGH output should be avoided as this condition can damage the

transmitter LED.

IRRX1_LV

IRRX1 Level (Read Only). This bit reflects the value of the UART[x]_IR_RX input signal.

RSVD

Reserved. Write as 0.

2:0

IRIC[2:0]

Transceiver Identification and Control Bits 2 through 0. The function of IRIC0

depends on whether the UART[x]_IRSL0/IRRX2 signal is programmed as an input or an

output. If programmed as an input (IRSL0_DS = 0, bit 5 of IRCFG4) then upon a read,

this bit returns the logic level of the signal. Data written to this bit position is ignored. The

other two signals (IRSL1, IRSL2) must be programmed as outputs only (IRSL21_DS = 1,

bit 3 of IRCFG4).

If the UART[x]_IRSL0/IRRX2 signal is programmed as an output, IRIC[2:0] drives the

IRSL[2:0] signals to select the operation mode of an infrared dongle. (These bits are

reflected in bits [4:2] of MSR_UART[x]_DONG). When read, these bits return the values

previously written.

Below is the operation mode encoding for non-serial transceivers.

00x: IrDA-data modes.

010: Reserved.

011: 36 kHz consumer IR.

100: 40 kHz consumer IR.

101: 38 kHz consumer IR

110: Reserved.

111: 56.9 kHz consumer IR.

CS5535 Datasheet(PDF) 398 Page - National Semiconductor (TI)

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