at83c26 ATMEL Corporation, at83c26 Datasheet - Page 50

• Manufacturer Part Number: at83c26
• Description: Multiple Smart Card Reader Interface With Power Management
• Manufacturer: ATMEL Corporation

Table 29. SC4_CFG0()
50
VCARD_INT4
Bit Number
1-0
7
7
6
5
4
3
2
AT83C26
VCARD_OK4
Bit Mnemonic
VCARD_INT4
VCARDERR4
VCARD_OK4
VCARD4[1:0]
6
ATRERR4
X
X
Reset value = 0x 000X X000
ATRERR4
Description
SC4 voltage interrupt
This bit is set when VCARD_OK4 bit is set.
This bit is cleared when read by the micro controller.
Answer to Reset Interrupt for SC4
This bit is set when the card clock counter overflows (no falling edge on CIO4 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.
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.
VCRD4[1:0] = 00: 0V
VCRD4[1:0] = 01: 1.8V class C
VCRD4[1:0] = 10: 3V class B
VCRD4[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.
SC4 Voltage Status
This bit is set by the LD04 when the output voltage remains within the voltage range specified by
VCARD4[1:0] bits.
It is cleared otherwise.
Interface 4 Card Out of Range Voltage Interrupt
This bit is set when the output voltage on CVCC
Interface 4 Card Voltage Selection
5
4
X
X
3
N
goes out of the voltage range specified by VCRDN field. It
VCARDERR4
2
VCARD41
1
7511D–SCR–02/07
VCARD40
0