AT83C24B-PRRIM datasheet(21/42 Pages) ATMEL

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4234G–SCR–01/07

AT83C24

Registers

Table 6. CONFIG0 (Config Byte 0)

ATRERR

INSERT

ICARDERR VCARDERR

VCARD1

VCARD0

Bit

Number

Bit Mnemonic Description

7-6

1-0

These bits cannot be programmed and are read as 1-0.

ATRERR

Answer to Reset Interrupt

This bit is set when the card clock counter overflows (no falling edge on CIO

is received before the overflow of the card clock counter).

This bit is cleared by hardware when this register is read. It can be set by

software for test purpose. The reset value is 0.

INSERT

Card Insertion Interrupt

This bit is set when a card is inserted or extracted: a change in CARDIN value

filtered according to CDS[2-0]. After power up, if the level on CPRES pin is 0,

then INSERT bit is set.

It can be set by software for test purpose.

This bit is cleared by hardware when this register is read. It cannot be cleared

by software.

The reset value is 0.

ICARDERR

Card Over Current Interrupt

This bit is set when an over current is detected on CVCC. It can be set by

software for test purpose (no card deactivation is performed, no IT is

performed).

This bit is cleared by hardware when this register is read. It cannot be cleared

by software.

The reset value is 0.

VCARDERR

Card Out of Range Voltage Interrupt

This bit is set when the output voltage goes out of the voltage range specified

by VCARD field. It can be set by software for test purpose and deactivate the

card.

This bit is cleared by hardware when this register is read. It cannot be cleared

by software.

The reset value is 0.

1-0

VCARD[1:0]

Card Voltage Selection

VCARD[1:0] = 00: 0V

VCARD[1:0] = 01: 1.8V (see STEPREG bit)

VCARD[1:0] = 10: 3V

VCARD[1:0] = 11: 5V

VCARD[1:0] writing to 1.8V, 3V, 5V starts the DC/DC if a card is detected.

VCARD[1:0] writing to 0 stops the DC/DC.

No card deactivation is performed when the voltage is changed between

1.8V, 3V or 5V. The microcontroller should deactivate the card before

changing the voltage.

The reset value is 00.

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