AT89C5115-RATUM datasheet(5/113 Pages) ATMEL

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AT89C5115

4128F–8051–05/06

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 (IIL, 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 T89C5115 Port 2 can sink or source 5mA. It can drive CMOS inputs without external pull-ups.

AT89C5115-RATUM 数据表(PDF) 5 Page - ATMEL Corporation

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