P89V51RB2FA View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

P89V51RB2FA

8-bit 80C51 5 V low power 16/32/64 kB flash microcontroller with 1 kB RAM

NXP Semiconductors. 

NXP Semiconductors

P89V51RB2/RC2/RD2

8-bit microcontrollers with 80C51 core

5.2 Pin description

Table 3. P89V51RB2/RC2/RD2 pin description

Symbol

Pin

Type

DIP40 TQFP44 PLCC44

P0.0 to P0.7

I/O

P0.0/AD0

39

37

43

I/O

I/O

P0.1/AD1

38

36

42

I/O

I/O

P0.2/AD2

37

35

41

I/O

I/O

P0.3/AD3

36

34

40

I/O

I/O

P0.4/AD4

35

33

39

I/O

I/O

P0.5/AD5

34

32

38

I/O

I/O

P0.6/AD6

33

31

37

I/O

I/O

P0.7/AD7

32

30

36

I/O

I/O

P1.0 to P1.7

I/O with

internal

pull-up

P1.0/T2

1

40

2

I/O

I/O

P1.1/T2EX 2

41

3

I/O

I

Description

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. Port 0 also receives the code bytes

during the external host mode programming, and outputs

the code bytes during the external host mode verification.

External pull-ups are required during program verification

or as a general purpose I/O port.

P0.0 — Port 0 bit 0.

AD0 — Address/data bit 0.

P0.1 — Port 0 bit 1.

AD1 — Address/data bit 1.

P0.2 — Port 0 bit 2.

AD2 — Address/data bit 2.

P0.3 — Port 0 bit 3.

AD3 — Address/data bit 3.

P0.4 — Port 0 bit 4.

AD4 — Address/data bit 4.

P0.5 — Port 0 bit 5.

AD5 — Address/data bit 5.

P0.6 — Port 0 bit 6.

AD6 — Address/data bit 6.

P0.7 — Port 0 bit 7.

AD7 — Address/data bit 7.

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. Port 1 also receives the low-order address

bytes during the external host mode programming and

verification.

P1.0 — Port 1 bit 0.

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

from Timer/counter 2.

P1.1 — Port 1 bit 1.

T2EX: Timer/counter 2 capture/reload trigger and direction

control.

P89V51RB2_RC2_RD2_5

Product data sheet

Rev. 05 — 12 November 2009

© NXP B.V. 2009. All rights reserved.

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