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ST16C654CQ100 Arkusz danych(PDF) 11 Page - Exar Corporation |
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ST16C654CQ100 Arkusz danych(HTML) 11 Page - Exar Corporation |
11 / 49 page ST16C654/654D 5-75 Rev. 4.10 Symbol Pin Signal Pin Description 68 100 64 type Enhanced Feature Register (EFR) bit-7, for hardware flow control operation. -DSR A-B 10,26 7,23 1,17 -DSR C-D 44,60 58,74 32,48 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. -DTR A-B 12,24 9,21 3,15 -DTR C-D 46,58 60,72 34,46 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 654 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, or after a reset. This pin has no effect on the UART’s transmit or receive opera- tion. -RI A-B 8,28 98,33 63,19 -RI C-D 42,62 48,84 30,50 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 11,19 5,13 -RTS C-D 48,56 62,70 36,44 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 only affects the transmit and receive operations when Auto RTS function is enabled via the Enhanced Feature Register (EFR) bit-6, for hardware flow control operation. SYMBOL DESCRIPTION |
Podobny numer części - ST16C654CQ100 |
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Podobny opis - ST16C654CQ100 |
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