Datenblatt-Suchmaschine für elektronische Bauteile |
|
TL16C550 Datenblatt(PDF) 5 Page - Texas Instruments |
|
TL16C550 Datenblatt(HTML) 5 Page - Texas Instruments |
5 / 31 page TL16C550A ASYNCHRONOUS COMMUNICATIONS ELEMENT SLLS057D – AUGUST 1989 – REVISED MARCH 1996 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions (continued) TERMINAL I/O DESCRIPTION NAME NO.† I/O DESCRIPTION RI 39 [43] 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] O Request to send. When active, RTS informs the modem or data set that the ACE is ready to transmit 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 modem control register. RXRDY 29 [32] O Receiver ready output. Receiver direct memory access (DMA) signalling is available with RXRDY. When operating in the FIFO mode, one of two types of DMA signalling can be selected with 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), if there is at least 1 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] I Serial input. SIN is a serial data input from a connected communications device. SOUT 11 [13] O Serial output. SOUT is a composite serial data output to a connected communication device. SOUT is set to the marking (high) state as a result of master reset. TXRDY 24 [27] O Transmitter ready output. Transmitter DMA signalling is available with TXRDY. When operating in the FIFO mode, one of two types of DMA signalling can be selected with 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] 5-V supply voltage VSS 20 [22] Supply common WR1 WR2 18 [20] 19 [21] I Write inputs. When either WR1 or WR2 are active (high or low respectively) 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 [18] 17 [19] I/O External clock. XIN and XOUT connect the ACE to the main timing reference (clock or crystal). † Terminal numbers shown in brackets are for the FN package. |
Ähnliche Teilenummer - TL16C550 |
|
Ähnliche Beschreibung - TL16C550 |
|
|
Link URL |
Privatsphäre und Datenschutz |
ALLDATASHEETDE.COM |
War ALLDATASHEET hilfreich? [ DONATE ] |
Über Alldatasheet | Werbung | Kontakt | Privatsphäre und Datenschutz | Linktausch | Hersteller All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |