AT83C26-RKRUL Atmel, AT83C26-RKRUL Datasheet - Page 48

• Manufacturer Part Number: AT83C26-RKRUL
• Description: RFID Modules & Development Tools 3V Smart card reader
• Manufacturer: Atmel

Table 27. SC3_CFG0()
48
Bit Number
VCARD_INT3
1-0
7
6
5
4
3
2
7
AT83C26
Bit Mnemonic
VCARD_INT3
VCARDERR3
VCARD_OK3
VCARD3[1:0]
VCARD_OK3
ATRERR3
X
X
6
Reset value = 0x 000X 0000
Description
SC3 voltage interrupt
This bit is set when VCARD_OK3 bit is set.
This bit is cleared when read by the micro controller.
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.
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.
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.
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.
Interface 3 Card Out of Range Voltage Interrupt
This bit is set when the output voltage on CVCC
Interface 3 Card Voltage Selection
ATRERR3
5
4
X
3
X
N
goes out of the voltage range specified by VCRDN field. It
VCARDERR3
2
VCARD31
1
7511D–SCR–02/07
VCARD30
0