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ST16C554D Datasheet(PDF) 10 Page - Exar Corporation |
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ST16C554D Datasheet(HTML) 10 Page - Exar Corporation |
10 / 40 page ST16C554/554D/68C554 10 Rev. 3.10 Symbol Pin Signal Pin Description 68 64 type SYMBOL DESCRIPTION -RI A-B 8,28 63,19 -RI C-D 42,62 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 5,13 -RTS C-D 48,56 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 has no effect on the UARTs transmit or receive operation. RX A-B 7,29 62,20 RX C-D 41,63 29,51 I Receive Data Input RX A-D. - These inputs are associated with individual serial channel data to the ST16C554D. The RX signal will be a logic 1 during reset, idle (no data), or when the transmitter is disabled. During the local loopback mode, the RX input pin is disabled and TX data is internally connected to the UART RX Input, internally. TX A-B 17,19 8,10 TX C-D 51,53 39,41 O Transmit Data - These outputs are associated with indi- vidual serial transmit channel data from the 554D. The TX signal will be a logic 1 during reset, idle (no data), or when the transmitter is disabled. During the local loopback mode, the TX input pin is disabled and TX data is internally connected to the UART RX Input. |
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