BN87C51FB datasheet(4/18 Pages) INTEL

Part #	BN87C51FB

Description	CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

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Manufacturer	INTEL [Intel Corporation]

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AUTOMOTIVE 87C51FAFBFCFC-20

Port 0 is also the multiplexed low-order address and

data bus during accesses to external Program and

Data Memory In this application it uses strong inter-

nal pullups when emitting 1’s and can source and

sink several LS TTL inputs

Port 0 also receives the code bytes during EPROM

programming and outputs the code bytes during

program verification External pullup resistors are re-

quired during program verification

Port 1

Port 1 is an 8-bit bidirectional IO port with

internal pullups The Port 1 output buffers can drive

LS TTL inputs Port 1 pins that have 1’s written to

them are pulled high by the internal pullups and in

that state can be used as inputs As inputs Port 1

pins that are externally pulled low will source current

(IIL on the data sheet) because of the internal pull-

ups

In addition Port 1 serves the functions of the follow-

ing special features of the 87C51FBFC

Port Pin

Alternate Function

P10

T2 (External Count Input to

TimerCounter 2)

P11

T2EX (TimerCounter 2 Capture

Reload Trigger and Direction Control)

P12

ECI (External Count Input to the PCA)

P13

CEX0 (External IO for Compare

Capture Module 0)

P14

CEX1 (External IO for Compare

Capture Module 1)

P15

CEX2 (External IO for Compare

Capture Module 2)

P16

CEX3 (External IO for Compare

Capture Module 3)

P17

CEX4 (External IO for Compare

Capture Module 4)

Port 1 receives the low-order address bytes during

EPROM programming and verifying

Port 2

Port 2 is an 8-bit bidirectional IO port with

internal pullups The Port 2 output buffers can drive

LS TTL inputs Port 2 pins that have 1’s written to

them are pulled high by the internal pullups and in

that state can be used as inputs As inputs Port 2

pins that are externally pulled low will source current

(IIL on the data sheet) because of the internal pull-

ups

PACKAGES

Part

Prefix

Package Type

87C51FAFBFC

P

40-Pin Plastic DIP

N

44-Pin PLCC

DIP

270961 – 3

PAD (PLCC)

270961 – 4

EPROM only

Do not connect reserved pins

Diagrams are for pin reference only Package sizes are

not to scale

Figure 3 Pin Connections (Top View)

4

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