AT85C5122D-RDRUM datasheet(76/208 Pages) ATMEL

No de pièce	AT85C5122D-RDRUM

Description	C51 Microcontroller with USB and Smart Card Reader Interfaces

PDF	208 Pages

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Fabricant	ATMEL [ATMEL Corporation]

Site Internet	http://www.atmel.com

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76 / 208 page

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Alternate Card

A second card named ‘Alternate Card’ can be controlled.

The Clock signal CCLK1 can be adapted to the XTAL frequency. Thanks to the clock

prescaler which can divide the frequency by 1, 2, 4 or 8. The bits ALTKPS0 and

ALTKPS1 in SCSR Register are used to set this factor.

Figure 44.

Alternate Card

Registers

There are fifteen registers to control the SCIB macro-cell. They are described from

Table 58 to Table 45.

Some of the register widths are greater than a byte. Despite the 8 bits access provided

by the BIU, the address mapping of this kind of register respects the following rule :

The Low significant byte register is implemented at the higher address.

This implementation makes access to these registers easier when using high level pro-

gramming languages (C,C++).

SIM, SAM

CARD

Alternate

card

CVCC

CRST

CIO

CCLK

CK_IDLE

CCLK1

SCSR Reg.

PR3

SCCLK1

1, 1/2, 1/4 or 1/8

P1.7

Main

card

CPRES

SMART

CARD

SCSR Reg.

ALTKPS0,1

AT85C5122D-RDRUM Fiches technique(PDF) 76 Page - ATMEL Corporation