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ST16C2550 Fiches technique(PDF) 6 Page - Exar Corporation |
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ST16C2550 Fiches technique(HTML) 6 Page - Exar Corporation |
6 / 34 page ST16C2550 6 Rev. 3.20 SYMBOL DESCRIPTION Symbol Pin Signal Pin Description 40 44 48 type XTAL1 16 18 13 I Crystal or External Clock Input - Functions as a crystal input or as an external clock input. A crystal can be connected between this pin and XTAL2 to form an internal oscillator circuit. This configuration requires an external 1 MW resis- tor between the XTAL1 and XTAL2 pins. Alternatively, an external clock can be connected to this pin to provide custom data rates (see Baud Rate Generator Program- ming). XTAL2 17 19 14 O Output of the Crystal Oscillator or Buffered Clock - (See also XTAL1). Crystal oscillator output or buffered clock output. Should be left open if an external clock is connected to XTAL1. -CD A-B 38,19 42,21 40,16 I Carrier Detect (active low) - These inputs are associated with individual UART channels A through B. A logic 0 on this pin indicates that a carrier has been detected by the modem for that channel. -CTS A-B 36,25 40,28 38,23 I Clear to Send (active low) - These inputs are associated with individual UART channels, A through B. A logic 0 on the - CTS pin indicates the modem or data set is ready to accept transmit data from the 2550. Status can be tested by reading MSR bit-4. This pin has no effect on the UARTs transmit or receive operation. -DSR A-B 37,22 41,25 39,20 I Data Set Ready (active low) - These inputs are associated with individual UART channels, A through B. 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 UARTs transmit or receive operation. -DTR A-B 33,34 37,38 34,35 O Data Terminal Ready (active low) - These outputs are associated with individual UART channels, A through B. A logic 0 on this pin indicates that the 2550 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 |
Numéro de pièce similaire - ST16C2550 |
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Description similaire - ST16C2550 |
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