Rainbow-electronics AT83C26 Manual de usuario descargar pdf (Pagina 52)

7511B–SCR–10/05

AT83C26

Reset value = 0x 000X X000

Table 31. SC5_CFG0()

7 6 5 4 3 2 1 0

VCARD_INT5 VCARD_OK5 ATRERR5 X X VCARDERR5 VCARD51 VCARD50

Bit Number Bit Mnemonic Description

7 VCARD_INT5

SC5 voltage interrupt

This bit is set when VCARD_OK5 bit is set.

This bit is cleared when read by the micro controller.

6 VCARD_OK5

SC5 Voltage Status

This bit is set by the LDO5 when the output voltage remains within the voltage range specified by

VCARD5[1:0] bits.

It is cleared otherwise.

5 ATRERR5

Answer to Reset Interrupt for SC5

This bit is set when the card clock counter overflows (no falling edge on CIO5 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 X

3 X

2 VCARDERR5

Interface 5 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 VCARD5[1:0]

Interface 5 Card Voltage Selection

VCRD5[1:0] = 00: 0V

VCRD5[1:0] = 01: 1.8V class C

VCRD5[1:0] = 10: 3V class B

VCRD5[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.

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Rainbow-electronics AT83C26 Manual de usuario Pagina 52