ST16C580CP40 datasheet(6/41 Pages) EXAR

6 / 41 page

ST16C580

Rev. 1.20

RESET

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

Pwr

Power Supply Input.

XTAL1

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

Output of the Crystal Oscillator or Buffered Clock - (See also

XTAL1). Crystal oscillator output or buffered clock output.

-CD

Carrier Detect (active low) - A logic 0 on this pin indicates

that a carrier has been detected by the modem.

-CTS

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

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

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

SYMBOL DESCRIPTION

Symbol

Signal

Pin Description

type

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