Atmel AT89STK-09 User Manual page 6

Hardware
2.3.1 CPRES0 & 1
External Pullups
2-5
7521B–SCR–10/05
• IO1, IO2, AUX1 and AUX2 are connected to the host smart card interface signals
depending on the configuration chosen. (Refer to the datasheet AT83C26)
Table 2-1. U1 Description
# Name
1 CCLK
2 INT
3 CRST
4 Not Connected
5 VSS
6 CLK
7 VSS
8 Not Connected
9 AUX2
10 RESET
R1(component side), R2 (solder side) can be added if internal CPRES0, CPRES1 pull
up are not activated. R1, R2 recommended values are between 27KOhms to 1MOhms.
By default, resistors value is 180KOhms
Color
Brown
Red
Orange
Yellow
Green
Blue
Velvet
Grey
Blank
Black
#1 Name Color
11 AUX1 Brown
12 Not Connected Red
13 IO2 Orange
14 BY PASS Yellow
15 IO1 Green
16 VSS Blue
17 SCL Velvet
18 VCC Grey
19 SDA Blank
20 EVCC Black
AT89STK-09 User Guide