T89C5115-RATIM datasheet(4/105 Pages) ATMEL

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T89C5115

4128A–8051–04/02

Table 1. Pin Description

Pin Name

Type

Description

VSS

GND

Circuit ground

VCC

Supply Voltage

VAREF

Reference Voltage for ADC

VAVCC

Supply Voltage for ADC

VAGND

Reference Ground for ADC

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 register (in this case the internal pull-ups are disconnected).

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.

P2.0:7

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 theT89C51CC02Port 2 cansinkor source5 mA. It can driveCMOS inputs

without external pull-ups.

T89C5115-RATIM 数据表(PDF) 4 Page - ATMEL Corporation

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