Rainbow Electronics AT83C26 - Manual (Page 48)

48
7511B–SCR–10/05
AT83C26
Reset value = 0x 000X 0000
Table 27. SC3_CFG0()
7 6 5 4 3 2 1 0
VCARD_INT3 VCARD_OK3 ATRERR3 X X VCARDERR3 VCARD31 VCARD30
Bit Number Bit Mnemonic Description
7 VCARD_INT3
SC3 voltage interrupt
This bit is set when VCARD_OK3 bit is set.
This bit is cleared when read by the micro controller.
6 VCARD_OK3
SC3 Voltage Status
This bit is set by the LDO3 when the output voltage remains within the voltage range specified by
VCARD3[1:0] bits.
It is cleared otherwise.
5 ATRERR3
Answer to Reset Interrupt for SC3
This bit is set when the card clock counter overflows (no falling edge on CIO3 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 VCARDERR3
Interface 3 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 VCARD3[1:0]
Interface 3 Card Voltage Selection
VCRD3[1:0] = 00: 0V
VCRD3[1:0] = 01: 1.8V class C
VCRD3[1:0] = 10: 3V class B
VCRD3[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.