AT89C5121 데이터 시트보기 (PDF) - Atmel Corporation

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AT89C5121

8-bit Microcontroller with Multiprotocol Smart Card Interface

Atmel Corporation 

Table 1. Ports Description (Continued)

Port

Signal

Name

Alternate

Internal

Power

Supply

RST

VCC

XTAL1

VCC

XTAL2

VCC

VCC

LI

CVCC

DVCC

EVCC

VCC

CVSS

VSS

ESD

Type Description

I/O Reset input

Holding this pin low for 64 oscillator periods while the oscillator

is running resets the device. The Port pins are driven to their reset

conditions when a voltage lower than VIL is applied, whether or

not the oscillator is running.

This pin has an internal pull-up resistor which allows the device to be reset by

connecting a capacitor between this pin and VSS.This capacitor is optional

thanks to the internal POR which output a Reset as long as Vcc has not

reached the POR threshold level

Asserting RST when the chip is in Idle mode or Power-down mode

returns the chip to normal operation.

The output is active for at least 12 oscillator periods when an internal

reset occurs.

I Input to the on-chip inverting oscillator amplifier

To use the internal oscillator, a crystal/resonator circuit is connected

to this pin.

If an external oscillator is used, its output is connected to this pin.

O Output of the on-chip inverting oscillator amplifier

To use the internal oscillator, a crystal/resonator circuit is connected

to this pin.

If an external oscillator is used, XTAL2 may be left unconnected.

PWR Supply voltage

VCC is used to power the internal voltage regulators and internal I/O’s.

PWR

DC/DC input

LI must be tied to VCC through an external coil (typically 4, 7 μH) and provide

the current for the pump charge of the DC/DC converter.

PWR

Card Supply voltage

CVCC is the programmable voltage output for the Card interface.

It must be connected to an external decoupling capacitor.

PWR

Digital Supply voltage

DVCC is used to supply the digital core and internal I/Os. It is

internally connected to the output of a 3V regulator and must be connected to

an external decoupling capacitor.

PWR

Extra supply voltage

EVCC is used to supply the level shifters of UART interface I/O

pins. It must be connected to an external decoupling capacitor.

This reference voltage is generated internally (automatically or not),

or it can be connected to an external voltage reference.

GND DC/DC ground

CVSS is used to sink high shunt currents from the external coil.

GND Ground

8 A/T8xC5121

4164G–SCR–07/06

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