ST16C580(2005) データシートの表示（PDF） - Exar Corporation

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ST16C580
(Rev.:2005)

UART WITH 16-BYTE FIFO’s AND INFRARED (IrDA) ENCODER/DECODER

Exar Corporation 

ST16C580

SYMBOL DESCRIPTION

Symbol

RESET

VCC

XTAL1

XTAL2

-CD

-CTS

-DSR

-DTR

Rev. 1.22

Pin

Signal

48 type

Pin Description

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.)

42 Pwr Power Supply Input.

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).

15

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

XTAL1). Crystal oscillator output or buffered clock output.

40

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

a carrier has been detected by the modem.

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.

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.

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.

5

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