AT85C5122D-RDRUM datasheet(90/208 Pages) ATMEL

Nome de Peças	AT85C5122D-RDRUM

Descrição Electrónicos	C51 Microcontroller with USB and Smart Card Reader Interfaces

PDF	208 Pages

Scroll/Zoom	100%

Fabricante Electrônico	ATMEL [ATMEL Corporation]

Página de início	http://www.atmel.com

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90 / 208 page

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Procedure for CVcc = 5volts

The DC/DC pump mode must be selected (MODE = 0 in DCCKPS register). The

detailed procedure is described in flow chart of Figure 47.

Figure 47.

Card Vcc = 5V Initialization Procedure

While VCC remains higher than 4.0V and startup current lower than 30 mA (depending

on the load type), the DC/DC converter should be ready without having to increment

BOOST[1:0] bits beyond [0:0] level. If VCC > 4.0V and startup current > 30 mA, it will be

necessary to increment the BOOST[1:0] bits until the DC/DC converter is ready.

Incrementation of BOOST[1:0] bits increases at the same time the current overflow level

in the same proportion as the startup current. So once the DC/DC converter is ready it is

SCCON CardVcc=1

VCARDOK=1

Set Timeout to 3 ms

Timeout

Expired

Increment

BOOST [1:0]

BOOST[1:0]

= max = 3?

DC/DC Initialization

Failure

DC/DC Initialization

Successful

Decrement

BOOST[1:0]

to adjust the

current overflow

Mode Pump

DCCKPS[7]=0

BOOST[1:0]=[0:0]

SCICR.7=Reset=0

SCICR.7=Reset=1

VCARD[1:0] = 11

BOOST[1:0]

= [0:0]

AT85C5122D-RDRUM Folha de dados(PDF) 90 Page - ATMEL Corporation