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TL16C550 数据表(PDF) 6 Page - Texas Instruments |
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TL16C550 数据表(HTML) 6 Page - Texas Instruments |
6 / 35 page TL16C550B, TL16C550BI ASYNCHRONOUS COMMUNICATIONS ELEMENT SLLS136B – JANUARY 1994 – REVISED AUGUST 1996 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions (Continued) TERMINAL NAME NO. N NO. FN NO. PT I/O DESCRIPTION RD1 RD2 21 22 24 25 19 20 I Read inputs. When either input is active (low or high respectively) while the ACE is selected, the CPU is allowed to read status information or data from a selected ACE register. Only one of these inputs is required for the transfer of data during a read operation; the other input should be tied in its inactive state (i.e., RD2 tied low or RD1 tied high). RI 39 43 41 I Ring indicator. RI is a modem status signal. Its condition can be checked by reading bit 6 (RI) of the modem status register. Bit 2 (TERI) of the modem status register indicates that the RI input has transitioned from a low to a high state since the last read from the modem status register. If the modem status interrupt is enabled when this transition occurs, an interrupt is generated. RTS 32 36 32 O Request to send. When active, RTS informs the modem or data set that the ACE is ready to receive data. RTS is set to its active state by setting the RTS modem control register bit and is set to its inactive (high) state either as a result of a master reset or during loop mode operations or by clearing bit 1 (RTS) of the MCR. RXRDY 29 32 29 O Receiver ready output. Receiver direct memory access (DMA) signalling is available with this terminal. When operating in the FIFO mode, one of two types of DMA signalling can be selected using the FIFO control register bit 3 (FCR3). When operating in the TL16C450 mode, only DMA mode 0 is allowed. Mode 0 supports single-transfer DMA in which a transfer is made between CPU bus cycles. Mode 1 supports multitransfer DMA in which multiple transfers are made continuously until the receiver FIFO has been emptied. In DMA mode 0 (FCR0 = 0 or FCR0 = 1, FCR3 = 0), when there is at least one character in the receiver FIFO or receiver holding register, RXRDY is active low. When RXRDY has been active but there are no characters in the FIFO or holding register, RXRDY goes inactive (high). In DMA mode 1 (FCR0 = 1, FCR3 = 1), when the trigger level or the timeout has been reached, RXRDY goes active (low); when it has been active but there are no more characters in the FIFO or holding register, it goes inactive (high). SIN 10 11 7 I Serial data input. Input from a connected communications device SOUT 11 13 8 O Composite serial data output. Output to a connected communication device. SOUT is set to the marking (set) state as a result of master reset. TXRDY 24 27 23 O Transmitter ready output. Transmitter DMA signalling is available with this terminal. When operating in the FIFO mode, one of two types of DMA signalling can be selected using FCR3. When operating in the TL16C450 mode, only DMA mode 0 is allowed. Mode 0 supports single-transfer DMA in which a transfer is made between CPU bus cycles. Mode 1 supports multitransfer DMA in which multiple transfers are made continuously until the transmit FIFO has been filled. VCC 40 44 42 5-V supply voltage VSS 20 22 18 Supply common WR1 WR2 18 19 20 21 16 17 I Write inputs. When either input is active (high or low respectively) and while the ACE is selected, the CPU is allowed to write control words or data into a selected ACE register. Only one of these inputs is required to transfer data during a write operation; the other input should be tied in its inactive state (i.e., WR2 tied low or WR1 tied high). XIN XOUT 16 17 18 19 14 15 I/O External clock. XIN and XOUT connect the ACE to the main timing reference (clock or crystal). |
类似零件编号 - TL16C550 |
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类似说明 - TL16C550 |
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