P87C51MB2_MC2 datasheet(7/36 Pages) PHILIPS

Part #	P87C51MB2_MC2

Description	80C51 8-bit microcontroller family with extended memory 64 kB/96 kB OTP with 2 kB/3 kB RAM

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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7 / 36 page

Philips Semiconductors

P87C51MB2/P87C51MC2

80C51 8-bit microcontroller family

Product data

Rev. 03 — 13 November 2003

7 of 36

9397 750 12302

7.2 Pin description

Table 2:

Pin description

Symbol

Type

Description

P0.0 - P0.7

43 - 36

I/O

Port 0: Port 0 is an open drain, bidirectional I/O port. Port 0 pins that have 1s

written to them ﬂoat and can be used as high-impedance inputs. 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 internal pull-ups

when emitting 1s.

P1.0 - P1.7

2 - 9

I/O

Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups on all pins.

Port 1 pins that have 1s written to them are pulled HIGH by the internal pull-ups

and can be used as inputs. As inputs, port 1 pins that are externally pulled LOW

will source current because of the internal pull-ups.

2

I/O

• P1.0, T2

– Timer/Counter 2 external count input/Clock out

3I

• P1.1, T2EX

– Timer/Counter 2 Reload/Capture/Direction Control

4I

• P1.2, ECI

– External Clock Input to the PCA

5

I/O

• P1.3, CEX0

– Capture/Compare External I/O for PCA module 0

6

I/O

• P1.4, CEX1

– Capture/Compare External I/O for PCA module 1 (with pull-up on pin)

I/O

• MOSI

– SPI Master Out/Slave In (Selected when SPEN (SPCTL.6) is ‘1’, in which

case the pull-up for this pin is disabled)

7

I/O

• P1.5, CEX2

– Capture/Compare External I/O for PCA module 2 (with pull-up on pin)

I/O

• SPICLK

– SPI Clock (Selected when SPEN (SPCTL.6) is ‘1’, in which case the

pull-up for this pin is disabled)

8

I/O

• P1.6, CEX3

– Capture/Compare External I/O for PCA module 3

9

I/O

• P1.7, CEX4

– Capture/Compare External I/O for PCA module

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