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ST16C2550 Fiches technique(PDF) 7 Page - Exar Corporation |
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ST16C2550 Fiches technique(HTML) 7 Page - Exar Corporation |
7 / 34 page ST16C2550 7 Rev. 3.20 SYMBOL DESCRIPTION Symbol Pin Signal Pin Description 40 44 48 type pin has no effect on the UARTs transmit or receive opera- tion. -RI A-B 39,23 43,26 41,21 I Ring Indicator (active low) - These inputs are associated with individual UART channels, A through B. 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 32,24 36,27 33,22 O Request to Send (active low) - These outputs are associated with individual UART channels, A through B. 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 10,9 11,10 5,4 I Receive Data (A-B) - These inputs are associated with individual serial channel data to the 2550 receive input circuits, A-B. The RX signal will be a logic 1 during reset, idle (no data), or when the transmitter is disabled. During the local loop-back mode, the RX input pin is disabled and TX data is connected to the UART RX Input, internally. TX A-B 11,12 13,14 7,8 O Transmit Data (A-B) - These outputs are associated with individual serial transmit channel data from the 2550. The TX signal will be a logic 1 during reset, idle (no data), or when the transmitter is disabled. During the local loop-back mode, the TX output pin is disabled and TX data is internally connected to the UART RX Input. |
Numéro de pièce similaire - ST16C2550 |
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Description similaire - ST16C2550 |
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