P89V52X2FN datasheet(5/56 Pages) PHILIPS

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P89V52X2_1

Preliminary data sheet

Rev. 01 — 7 June 2007

5 of 56

NXP Semiconductors

P89V52X2

80C51 with 256 B RAM, 192 B data EEPROM

5.2 Pin description

Table 2.

Pin description

Symbol

Type

Description

DIP40

LQFP44

PLCC44

P0.0 to P0.7

I/O

Port 0: Port 0 is an 8-bit open-drain bidirectional I/O port.

Port 0 pins that have ‘1’s written to them float, and in this

state can be used as high-impedance inputs. Port 0 is also

the multiplexed low-order address and data bus during

accesses to external code and data memory. In this

application, it uses strong internal pull-ups when

transitioning to ‘1’s. External pull-ups are required as a

general purpose I/O port.

P0.0/AD0

I/O

P0.0 — Port 0 bit 0.

I/O

AD0 — Address/data bit 0.

P0.1/AD1

I/O

P0.1 — Port 0 bit 1.

I/O

AD1 — Address/data bit 1.

P0.2/AD2

I/O

P0.2 — Port 0 bit 2.

I/O

AD2 — Address/data bit 2.

P0.3/AD3

I/O

P0.3 — Port 0 bit 3.

I/O

AD3 — Address/data bit 3.

P0.4/AD4

I/O

P0.4 — Port 0 bit 4.

I/O

AD4 — Address/data bit 4.

P0.5/AD5

I/O

P0.5 — Port 0 bit 5.

I/O

AD5 — Address/data bit 5.

P0.6/AD6

I/O

P0.6 — Port 0 bit 6.

I/O

AD6 — Address/data bit 6.

P0.7/AD7

I/O

P0.7 — Port 0 bit 7.

I/O

AD7 — Address/data bit 7.

P1.0 to P1.7

I/O with

internal

pull-up

Port 1: Port 1 is an 8-bit bidirectional I/O port with internal

pull-ups. The Port 1 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 1 pins that are

externally pulled LOW will source current (IIL) because of

the internal pull-ups. P1.5, P1.6, P1.7 have high current

drive of 16 mA.

P1.0/T2

I/O

P1.0 — Port 1 bit 0.

T2 — External count input to Timer/Counter 2 or Clock-out

from Timer/Counter 2

P1.1/T2EX

I/O

P1.1 — Port 1 bit 1.

T2EX: Timer/Counter 2 capture/reload trigger and

direction control

P1.2

I/O

P1.2 — Port 1 bit 2.

P1.3

I/O

P1.3 — Port 1 bit 3.

P1.4

I/O

P1.4 — Port 1 bit 4.

P1.5

617I/O

P1.5 — Port 1 bit 5.

P1.6

728I/O

P1.6 — Port 1 bit 6.

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