AT80C5112 datasheet(6/97 Pages) ATMEL

6 / 97 page

AT8xC5112

4191B–8051–04/03

Table 2. Pin Description

Mnemonic

PIN NUMBER

TYPE

Name and Function

LQFP

PLCC

VSS

Ground: 0V reference.

VCC

Power Supply: This is the power supply voltage for normal, idle and power-down operation.

AVSS

Analog Ground: 0V reference.

AVCC

Analog Power Supply: This is the power supply voltage for normal and idle operation of the A/D

VREF

VREF : A/D converter positive reference input.

VPP

Vpp : Programming Supply Voltage:

This pin also receives the 12V programming pulse which will start the EPROM programming and the

manufacturer test modes.

P1.0 - P1.7

I/O

Port 1: Port 1 is an 8-bit bi-directional I/O port with internal pull-ups. Port 1 pins that have 1s written to them are

pulled high by the internal pull-ups and can be used as inputs.

Alternate functions for Port 1 include:

I/O

WR (P1.0): External data memory write strobe

I/O

RD (P1.1): External data memory readstrobe

I/O

ECI (P1.2): External Clock for the PCA

I/O

CEX0 (P1.3): Capture/Compare External I/O for PCA module 0

I/O

CEX1 (P1.4): Capture/Compare External I/O for PCA module 1

I/O

CEX2 (P1.5): Capture/Compare External I/O for PCA module 2

I/O

CEX3 (P1.6): Capture/Compare External I/O for PCA module 3

I/O

CEX4 (P1.7): Capture/Compare External I/O for PCA module 4

P3.0 - P3.7

I/O

Port 3: Port 3 is an 8-bit bi-directional I/O port with internal pull-ups. Port 3 pins that have 1s written to them are

pulled high by the internal pull-ups and can be used as inputs.

P3.6 is an input only pin.

Port 3 also serves the special features of the 80C51 family, as listed below.

I/O

RXD (P3.0): Serial input port

I/O

TXD (P3.1): Serial output port

I/O

INT0 (P3.2): External interrupt 0

I/O

T0 (P3.3): Timer 0 external input

P4.0-P4.7

I/O

Port 4: Port 4 is an 8-bit bi-directional I/O port. Each bit can be set as pure CMOS input or as push-pull output.

Port 4 is also the input port of the analog-to-digital converter and used for oscillator and reset.

I/O

AIN0 (P4.0): A/D converter input 0

I/O

AIN1 (P4.1): A/D converter input 1

T1: Timer 1 external input

I/O

AIN2 (P4.2): A/D converter input 2

SS: Slave select input of the SPI controller

I/O

AIN3 (P4.3): A/D converter input 3

INT1: External interrupt 1

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