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

A0

A1

A2

IOR

CS0

CS1

-CS2

IOW

-AS

D0-D7

GND

Pin

Signal

48 type

Pin Description

28

I Address-0 Select Bit - Internal registers address selection.

27

I Address-1 Select Bit Internal registers address selection.

26

I Address-2 Select Bit Internal registers address selection.

20

I Read strobe. Its function is the same as -IOR (see -IOR),

except it is active high. Either an active -IOR or IOR is

required to transfer data from 580 to CPU during a read

operation.

9

I Chip Select-0. A logical 1 on this pin provides the chip select

0 function.

10

I Chip Select-1. A logical 1 on this pin provides the chip select

1 function.

11

I Chip Select -2. A logical 0 on this pin provides the chip select

2 function.

17

I Write strobe. A logic 1 transition creates a write strobe. Its

function is the same as -IOW (see -IOW), but it acts as an

active high input signal. Either -IOW or IOW is required to

transfer data from the CPU to 580 during a write operation.

24

I Address Strobe. A logic 1 transition on -AS latches the state

of the chip selects and the register select bits, A0-A2. This

input is used when address and chip selects are not stable for

the duration of a read or write operation, i.e., a microprocessor

that needs to de-multiplex the address and data bits. If not

required, the -AS input can be permanently tied to a logic 0

(it is edge triggered).

43-47

2-4 I/O Data Bus (Bi-directional) - These pins are the eight bit, three

state data bus for transferring information to or from the

controlling CPU. D0 is the least significant bit and the first

data bit in a transmit or receive serial data stream.

18 Pwr Signal and Power Ground.

Rev. 1.22

3

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