TIR2000 datasheet(11/63 Pages) TI

11 / 63 page

1–5

1.5

Terminal Functions (Continued)

IRRVL

Infrared receive. IRRVL is connected to the IR transceiver module and receives data

in the slow-speed mode such as the SIR, Sharp Ir, and TV remote-control modes.

IRTX

Infrared transmit. IRTX is an output terminal connected to the IR transceiver module

and transmits data out from the TIR2000.

Read. RD is an active-low signal that indicates when the CPU reads data from the

TIR2000.

RESET

Reset. When active (high), RESET is used for system reset operation.

Ring indicator. RI is a modem-status signal. Its condition can be checked by reading

bit 6 (RI) of the MSR. Bit 2 (TERI) of the MSR indicates that RI has transitioned from

a low to a high level since the last read from the MSR. If the modem-status interrupt

is enabled when this transition occurs, an interrupt is generated.

RTS

Request to send. When low, RTS informs the modem or data set that the ACE is ready

to receive data. RTS is set low by setting the RTS MCR bit and is set to its inactive (high)

level either as a result of a master reset, during loop mode operations, or by clearing

bit 1 (RTS) of the MCR. In the auto-RTS mode, RTS is set low by the receiver threshold

control logic.

SIN

Serial data. SIN is the input from a connected communications device.

SOUT

Composite serial data output. SOUT is connected to a communication device. SOUT

is set to the marking (high) level as a result of master reset.

Terminal count. TC comes from the DMA controller and indicates the end of the block

transfer.

TEST

Test terminal. TEST is used for test purposes only and should be tied low in normal

operation.

VCC

17, 44,

5-V or 3-V supply voltage.

Write. WR is an active low signal that indicates that the CPU is writing data to the

TIR2000.

Xin, Xout

49, 51

I/O

Crystal connectors. A 48-MHz crystal should be connected across these terminals.

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