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ST16C580 Datasheet(PDF) 5 Page - Exar Corporation |
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ST16C580 Datasheet(HTML) 5 Page - Exar Corporation |
5 / 39 page ST16C580 5 Rev. 1.22 RESET 35 I Reset. (active high) - A logic 1 on this pin will reset the internal registers and all the outputs. The UART transmitter output and the receiver input will be disabled during reset time. (See ST16C580 External Reset Conditions for initialization de- tails.) VCC 42 Pwr Power Supply Input. XTAL1 14 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. An external 1 M resistor is required between the XTAL1 and XTAL2 pins (see figure 9). Alternatively, an external clock can be connected to this pin to provide custom data rates (Programming Baud Rate Generator section). XTAL2 15 O Output of the Crystal Oscillator or Buffered Clock - (See also XTAL1). Crystal oscillator output or buffered clock output. -CD 40 I Carrier Detect (active low) - A logic 0 on this pin indicates that a carrier has been detected by the modem. -CTS 38 I Clear to Send (active low) - A logic 0 on the -CTS pin indicates the modem or data set is ready to accept transmit data from the 580. Status can be tested by reading MSR bit-4. This pin only affects the transmit and receive operations when Auto CTS function is enabled via the Enhanced Feature Register (EFR) bit-7, for hardware flow control operation. -DSR 39 I Data Set Ready (active low) - 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 33 O Data Terminal Ready (active low) - A logic 0 on this pin indicates that the 580 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 operation. SYMBOL DESCRIPTION Symbol Pin Signal Pin Description 48 type |
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