IC89C51A-40W datasheet(6/22 Pages) ICSI

Part #	IC89C51A-40W

Description	CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8(4)-Kbytes of FLASH

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Manufacturer	ICSI [Integrated Circuit Solution Inc]

Direct Link	http://www.icsi.com.tw

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IC89C52(51)A

6

Integrated CircuitSolution Inc.

MC008-0C 11/27/2001

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

of the internal pullups. (See DC Characteristics: IIL).

Port 3 also serves the special features of the IC89C52(51)A, 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 (P3.2): External interrupt 0.

13

15

9

I

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

Program control signal while the chip programs and erases.

17

19

13

O

RD

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

Program control signal while the chip programs and erases.

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.

PSEN is an input control signal while memory program and

verification.

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 resistor to

VSS permits a power-on reset using only an external capacitor.

A small internal resistor permits power-on reset using only a

capacitor connected to VCC.

RST is an input control signal during memory program and

verification.

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)

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