T89C51CC02CA-RATIM datasheet(5/154 Pages) ATMEL

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T89C51CC02

4126H–CAN–01/05

Pin Description

Pin Name

Type

Description

VSS

GND

Circuit ground

VCC

Supply Voltage

VAREF

Reference Voltage for ADC (input)

VAVCC

Supply Voltage for ADC

VAGND

Reference Ground for ADC (internaly connected with the VSS)

P1.0:7

I/O

Port 1:

Is an 8-bit bi-directional I/O port with internal pull-ups. Port 1 pins can be used for digital input/output or as

analog inputs for the Analog Digital Converter (ADC). Port 1 pins that have 1’s written to them are pulled

high by the internal pull-up transistors and can be used as inputs in this state. As inputs, Port 1 pins that

are being pulled low externally will be the source of current (I

IL, See section ’Electrical Characteristic’)

because of the internal pull-ups. Port 1 pins are assigned to be used as analog inputs via the ADCCF

As a secondary digital function, port 1 contains the Timer 2 external trigger and clock input; the PCA

external clock input and the PCA module I/O.

P1.0/AN0/T2

Analog input channel 0,

External clock input for Timer/counter2.

P1.1/AN1/T2EX

Analog input channel 1,

Trigger input for Timer/counter2.

P1.2/AN2/ECI

Analog input channel 2,

PCA external clock input.

P1.3/AN3/CEX0

Analog input channel 3,

PCA module 0 Entry of input/PWM output.

P1.4/AN4/CEX1

Analog input channel 4,

PCA module 1 Entry of input/PWM output.

P1.5/AN5

Analog input channel 5,

P1.6/AN6

Analog input channel 6,

P1.7/AN7

Analog input channel 7,

It can drive CMOS inputs without external pull-ups.

P2.0:1

I/O

Port 2:

Is an 2-bit bi-directional I/O port with internal pull-ups. Port 2 pins that have 1’s written to them are pulled

high by the internal pull-ups and can be used as inputs in this state. As inputs, Port 2 pins that are being

pulled low externally will be a source of current (IIL, on the datasheet) because of the internal pull-ups.

In the T89C51CC02 Port 2 can sink or source 5mA. It can drive CMOS inputs without external pull-ups.

T89C51CC02CA-RATIM Datasheet(PDF) 5 Page - ATMEL Corporation

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