P89V51RB2BBC datasheet(8/80 Pages) NXP

8 / 80 page

P89V51RB2_RC2_RD2_5

Product data sheet

Rev. 05 — 12 November 2009

8 of 80

NXP Semiconductors

P89V51RB2/RC2/RD2

8-bit microcontrollers with 80C51 core

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. Port 3 also receives some control

signals and a partial of high-order address bits during the

external host mode programming and veriﬁcation.

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.

P3.5/T1

I/O

P3.5 — Port 3 bit 5.

T1 — External count input to Timer/counter 1.

P3.6/WR

P3.6 — Port 3 bit 6.

WR — External data memory write strobe.

P3.7/RD

P3.7 — Port 3 bit 7.

RD — External data memory read strobe.

PSEN

I/O

Program Store Enable: PSEN is the read strobe for

external program memory. When the device is executing

from internal program memory, PSEN is inactive (HIGH).

When the device is executing code from external program

memory, PSEN is activated twice each machine cycle,

except that two PSEN activations are skipped during each

access to external data memory. A forced HIGH-to-LOW

input transition on the PSEN pin while the RST input is

continually held HIGH for more than 10 machine cycles will

cause the device to enter external host mode

programming.

Table 3.

P89V51RB2/RC2/RD2 pin description …continued

Symbol

Type

Description

DIP40

TQFP44

PLCC44

P89V51RB2BBC Datasheet(PDF) 8 Page - NXP Semiconductors

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