at83c26 ATMEL Corporation, at83c26 Datasheet - Page 16

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

CIO2, CC42, CC82 controller for SC2 interface
CIOn controller for SCn interface (n=3, 4, 5)
CIOn (n=1 to 5), CC41, CC81, CC42, CC82 transparent mode description
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AT83C26
The SC2_FULL bit must be set to use CC42 and CC82.
The CIOn output pin is driven by CARDIOn bit values or by I/O1, I/O2, AUX1 or AUX2 signals.
This selection depends of the IODISn bit value. If IODISn is reset, data are bidirectional between
the I/O1, I/O2, AUX1, AUX2 pins (see IO_SELECT register) and CIOn pins.
Two modes are available on CIOn, CC4n, CC8n signals:
•
•
According to IO_SELECT register value and IODISn bits values, one of 4 input pins (IO1, IO2,
AUX1 or AUX2) is linked to the selected output.
The idle state is the high level. Each signal is bidirectional.
Figure 8. CIO2, CC42, CC82 Block Diagram
Figure 9. CIOn Block Diagram
Bit control (a bit controls the output pin)
Transparent mode (IO signal and CIO are linked after level shifter)
AUX1
AUX2
AUX1
AUX2
IO2
IO2
IO1
IO1
IODIS2 bit
IODISn bit
HiZ
control
HiZ
control
IOSEL[3:0]
IOSEL[3:0]
Multiplex
Multiplex
CARDIOn bit
CARDIO2 bit
CARDC82 bit
CARDC42 bit
1
1
0
0
1
1
0
0
7511D–SCR–02/07
CC82
CIOn
CIO2
CC42