P89V51RB2BBC datasheet(7/80 Pages) NXP

7 / 80 page

P89V51RB2_RC2_RD2_5

Product data sheet

Rev. 05 — 12 November 2009

7 of 80

NXP Semiconductors

P89V51RB2/RC2/RD2

8-bit microcontrollers with 80C51 core

P1.2/ECI

I/O

P1.2 — Port 1 bit 2.

ECI — External clock input. This signal is the external

clock input for the PCA.

P1.3/CEX0

I/O

P1.3 — Port 1 bit 3.

I/O

CEX0 — Capture/compare external I/O for PCA Module 0.

Each capture/compare module connects to a Port 1 pin for

external I/O. When not used by the PCA, this pin can

handle standard I/O.

P1.4/SS/CEX1 5

I/O

P1.4 — Port 1 bit 4.

SS — Slave port select input for SPI.

I/O

CEX1 — Capture/compare external I/O for PCA Module 1.

P1.5/MOSI/

CEX2

I/O

P1.5 — Port 1 bit 5.

I/O

MOSI — Master Output Slave Input for SPI.

I/O

CEX2 — Capture/compare external I/O for PCA Module 2.

P1.6/MISO/

CEX3

I/O

P1.6 — Port 1 bit 6.

I/O

MISO — Master Input Slave Output for SPI.

I/O

CEX3 — Capture/compare external I/O for PCA Module 3.

P1.7/SPICLK/

CEX4

I/O

P1.7 — Port 1 bit 7.

I/O

SPICLK — Serial clock input/output for SPI.

I/O

CEX4 — Capture/compare external I/O for PCA Module 4.

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. Port 2 also

receives some control signals and a partial of high-order

address bits during the external host mode programming

and veriﬁcation.

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.

Table 3.

P89V51RB2/RC2/RD2 pin description …continued

Symbol

Type

Description

DIP40

TQFP44

PLCC44

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