P89V52X2FN datasheet(6/56 Pages) PHILIPS

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P89V52X2_1

Preliminary data sheet

Rev. 01 — 7 June 2007

6 of 56

NXP Semiconductors

P89V52X2

80C51 with 256 B RAM, 192 B data EEPROM

P1.7

839I/O

P1.7 — Port 1 bit 7.

P2.0 to P2.7

I/O

with

internal

pull-up

Port 2: Port 2 is an 8-bit bidirectional I/O port with internal

pull-ups. Port 2 pins are pulled HIGH by the internal

pull-ups when ‘1’s are written to them and can be used as

inputs in this state. As inputs, Port 2 pins that are

externally pulled LOW will source current (IIL) because of

the internal pull-ups. Port 2 sends the high-order address

byte during fetches from external program memory and

during accesses to external Data Memory that use 16-bit

address (MOVX@DPTR). In this application, it uses strong

internal pull-ups when transitioning to ‘1’s.

P2.0/A8

I/O

P2.0 — Port 2 bit 0.

A8 — Address bit 8.

P2.1/A9

I/O

P2.1 — Port 2 bit 1.

A9 — Address bit 9.

P2.2/A10

I/O

P2.2 — Port 2 bit 2.

A10 — Address bit 10.

P2.3/A11

I/O

P2.3 — Port 2 bit 3.

A11 — Address bit 11.

P2.4/A12

I/O

P2.4 — Port 2 bit 4.

A12 — Address bit 12.

P2.5/A13

I/O

P2.5 — Port 2 bit 5.

A13 — Address bit 13.

P2.6/A14

I/O

P2.6 — Port 2 bit 6.

A14 — Address bit 14.

P2.7/A15

I/O

P2.7 — Port 2 bit 7.

A15 — Address bit 15.

P3.0 to P3.7

I/O

with

internal

pull-up

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

pull-ups. Port 3 pins are pulled HIGH by the internal

pull-ups when ‘1’s are written to them and can be used as

inputs in this state. As inputs, Port 3 pins that are

externally pulled LOW will source current (IIL) because of

the internal pull-ups.

P3.0/RXD

P3.0 — Port 3 bit 0.

RXD — Serial input port.

P3.1/TXD

P3.1 — Port 3 bit 1.

TXD — Serial output port.

P3.2/INT0

P3.2 — Port 3 bit 2.

INT0 — External interrupt 0 input.

P3.3/INT1

P3.3 — Port 3 bit 3.

INT1 — External interrupt 1 input

P3.4/T0

I/O

P3.4 — Port 3 bit 4.

T0 — External count input to Timer/Counter 0.

Table 2.

Pin description …continued

Symbol

Type

Description

DIP40

LQFP44

PLCC44

P89V52X2FN Datasheet(PDF) 6 Page - NXP Semiconductors

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