Rainbow-electronics AT83C26 Manual do Utilizador descarregar pdf (Página 45)

7511B–SCR–10/05

AT83C26

Reset value = 0x 0000 X000

Table 24. SC2_CFG0 ()

7 6 5 4 3 2 1 0

VCARD_INT

VCARD_OK

ATRERR2 INSERT2 X VCARDERR2 VCARD21 VCARD20

Bit Number Bit Mnemonic Description

7 VCARD_INT2

SC2 voltage interrupt

This bit is set when VCARD_OK2 bit is set.

This bit is cleared when read by the micro controller.

6 VCARD_OK2

SC2 Voltage Status

This bit is set by the LD02 when the output voltage remains within the voltage range specified by

VCARD2[1:0] bits.

It is cleared otherwise.

5 ATRERR2

Answer to Reset Interrupt for SC2

This bit is set when the card clock counter overflows (no falling edge on CIO2 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.

4 INSERT2

Card Insertion Interrupt

This bit is set when a card is inserted or extracted in SC2 connector: a change in CARDIN2 value filtered

according to CDS2[2-0]. 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.

3 X

2 VCARDERR2

Interface 2 Card Out of Range Voltage Interrupt

This bit is set when the output voltage on CVCC

goes out of the voltage range specified by VCRDN 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 VCARD2[1:0]

Interface 2 Card Voltage Selection

VCRD2[1:0] = 00: 0V

VCRD2[1:0] = 01: 1.8V class C

VCRD2[1:0] = 10: 3V class B

VCRD2[1:0] = 11: 5V class A

No card deactivation is performed when the voltage is changed. The micro controller should deactivate the

card before changing the voltage and activating the card again.

The reset value is 00.

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 76 77

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