4

AT83C23OK

4307CS–SCR–03/07

Pin Description

Table 1. Pin Description

Port

Internal

Power

Supply

ESD

I/O

Reset

Level

Alt

CIO

32

32

CVCC

6KV

I/O

0

Card interface-I/O pin

CVcc inactive at reset . ESD tested with 10µF on CVcc. An external pull-up of

4.7K

CC8

3

3

CVCC

6KV

I/O

0

Card interface-C8 pin

CVcc inactive at reset. ESD tested with 10µF on CVcc.

CPRES

2

2

VCC

2KV

I/O

1

Card Presence signal

If P3.4 pin is connected to GND, the card inserted information generates a high

level on CPRES pin.

Else, a low level on this pin indicates that a card is inserted.

CC4

5

5

CVCC

6KV

I/O

0

Card interface-C4 pin

CVcc inactive at reset. ESD tested with 10µF on CVcc.

CCLK

6

6

CVCC

6KV

O

0

Card interface-CLK pin

CVcc inactive at reset. ESD tested with 10µF on CVcc.

CRST

4

4

CVCC

6KV

O

0

Card interface-RST pin

CVcc inactive at reset. ESD tested with 10µF on CVcc.

P1.6

23

23

VCC

2KV

I/O

1

For Serial reader: Connect this to GND.

For USB reader: Leave this pin unconnected.

P1.7

31

31

VCC

2KV

I/O

1

Leave this pin unonnected

P3.0

22

22

VCC

2KV

I/O

1

For Serial reader: RxD: Connect this pin to the host TxD signal.

For USB reader: Connect this pin to GND.

P3.1

24

24

VCC

2KV

I/O

1

For Serial reader: TxD: Connect this pin to the host RxD signal.

For USB reader: Leave this pin unconnected.

P3.2

20

20

VCC

2KV

I/O

1

For Serial reader: INT0: Connect this pin to host RTS signal.

For USB reader: Connect this pin to GND.

P3.3

19

19

VCC

2KV

I/O

1

For Serial reader: Leave this pin unconnected.

For USB reader: Connect this pin to GND.

P3.4

18

18

VCC

2KV

I/O

1

Eject Signal

To support the eject of the smart card under control of the application. Please refer

to Design-In Manual for additionnal information.

This pin indicates also the polarity of Card Insertion Signal.

P3.5

21

21

VCC

2KV

I/O

1

For Serial reader: Connect this to GND.

For USB reader: Leave this pin unconnected.

SCL

17

17

VCC

2KV

I/O

1

TWI Expansion (I²C compliant)

May be used for memory extension, parallel port expanders and more.

Please refer to the Design-IN Manual.

SDA

13

13

VCC

2KV

I/O

1