IC80C54

IC80C58

6

Integrated Circuit Solution Inc.

MC003-0B

Symbol

PDIP

PLCC

PQFP

I/O

Name and Function

P3.0-P3.7

10-17

11, 13-19

5, 7-13

I/O

Port 3: Port 3 is an 8-bit bidirectional I/O port with internal

pullups. Port 3 pins that have 1s written to them are pulled high

by the internal pullups and can be used as inputs. As inputs, Port

3 pins that are externally pulled low will source current because

Port 3 also serves the special features of the IC80C54/58, as

listed below:

10

11

5

I

RxD (P3.0): Serial input port.

11

13

7

O

TxD (P3.1): Serial output port.

12

14

8

I

INT0

INT0

INT0

INT0

INT0 (P3.2): External interrupt 0.

13

15

9

I

INT1

INT1

INT1

INT1

INT1 (P3.3): External interrupt 1.

14

16

10

I

T0 (P3.4): Timer 0 external input.

15

17

11

I

T1 (P3.5): Timer 1 external input.

16

18

12

O

WR

WR

WR

WR

WR (P3.6): External data memory write strobe.

17

19

13

O

RD

RD

RD

RD

RD (P3.7): External data memory read strobe.

PSEN

29

32

26

O

Program Store Enable: The read strobe to external program

memory. When the device is executing code from the external

program memory,

PSEN is activated twice each machine cycle

except that two

PSEN activations are skipped during each

access to external data memory.

PSEN is not activated during

fetches from internal program memory.

RST

9

10

4

I

Reset: A high on this pin for two machine cycles while the

oscillator is running, resets the device. An internal MOS resistor

to GND permits a power-on reset using only an external capaci-

tor connected to Vcc.

XTAL 1

19

21

15

I

Crystal 1: Input to the inverting oscillator amplifier and input

to the internal clock generator circuits.

XTAL 2

18

20

14

O

Crystal 2: Output from the inverting oscillator amplifier.

GND

20

22

16

I

Ground: 0V reference.

Vcc

40

44

38

I

Power Supply: This is the power supply voltage for operation.

Table 1. Detailed Pin Description (continued)

OPERATING DESCRIPTION

The detail description of the IC80C54/58 included in this description are:

• Memory Map and Registers

• The Timer/Counters

• The Serial Interface

• The Interrupt System

• Information

• Another information

The detail information desription of the IC80C54/58 refer to IC80C52/32 date sheet