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TIR2000 Datasheet(PDF) 11 Page - Texas Instruments |
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TIR2000 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 63 page  1–5 1.5 Terminal Functions (Continued) IRRVL 63 I 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 62 O Infrared transmit. IRTX is an output terminal connected to the IR transceiver module and transmits data out from the TIR2000. RD 32 I Read. RD is an active-low signal that indicates when the CPU reads data from the TIR2000. RESET 35 I Reset. When active (high), RESET is used for system reset operation. RI 57 I 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 59 O 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 53 I Serial data. SIN is the input from a connected communications device. SOUT 58 O 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. TC 31 I Terminal count. TC comes from the DMA controller and indicates the end of the block transfer. TEST 52 I Test terminal. TEST is used for test purposes only and should be tied low in normal operation. VCC 17, 44, 60 5-V or 3-V supply voltage. WR 33 I 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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