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ST16C454IJ68 Folha de dados(PDF) 7 Page - Exar Corporation |
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ST16C454IJ68 Folha de dados(HTML) 7 Page - Exar Corporation |
7 / 29 page ST16C454 7 Rev. 3.31 -CD A-B 9,27 -CD C-D 43,61 I Carrier Detect (active low) - These inputs are associated with individual UART channels A through D. A logic 0 on this pin indicates that a carrier has been detected by the modem for that channel. -CTS A-B 11,25 -CTS C-D 45,59 I Clear to Send (active low) - These inputs are associated with individual UART channels, A through D. A logic 0 on the -CTS pin indicates the modem or data set is ready to accept transmit data from the 454. Status can be tested by reading MSR bit-4. -DSR A-B 10,26 -DSR C-D 44,60 I Data Set Ready (active low) - These inputs are associated with individual UART channels, A through D. A logic 0 on this pin indicates the modem or data set is powered-on and is ready for data exchange with the UART. This pin has no effect on the UART’s transmit or receive operation. This pin has no effect on the UART’s transmit or receive operation. -DTR A-B 12,24 -DTR C-D 46,58 O Data Terminal Ready (active low) - These inputs are associated with individual UART channels, A through D. A logic 0 on this pin indicates that the 454 is powered-on and ready. This pin can be controlled via the modem control register. Writing a logic 1 to MCR bit-0 will set the -DTR output to logic 0, enabling the modem. This pin will be a logic 1 after writing a logic 0 to MCR bit-0. This pin has no effect on the UART’s transmit or receive operation. -RI A-B 8,28 -RI C-D 42,62 I Ring Indicator (active low) - These inputs are associated with individual UART channels, A through D. A logic 0 on this pin indicates the modem has received a ringing signal from the telephone line. A logic 1 transition on this input pin will generate an interrupt. -RTS A-B 14,22 -RTS C-D 48,56 O Request to Send (active low) - These outputs are associated with individual UART channels, A through D. A logic 0 on the -RTS pin indicates the transmitter has data ready and waiting to send. Writing a logic 1 in the modem control register (MCR bit-1) will set this pin to a logic 0 indicating data is available. After a reset this pin will be set to a logic 1. This pin has no effect on the UART’s transmit Symbol Pin Signal Pin Description type SYMBOL DESCRIPTION |
Nº de peça semelhante - ST16C454IJ68 |
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Descrição semelhante - ST16C454IJ68 |
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