Rainbow Electronics AT83C26 - Manual (Page 52)

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
N
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.