Atmel AT89C51ED2 - Page 18

Appendix C: Board Schematics
4-17 AT89STK-11 Hardware User Guide
7676B–8051–08/07
Figure 4-3. AT89STK-11 Schematics (2 of 4)
Vss Vcc
Vcc
Vcc
Vcc Vcc
Vcc Vcc Vcc Vcc Vcc Vcc Vcc Vcc
Vcc Vcc Vcc Vcc
Vcc Vcc
Vcc
P1.1/T2EX/SS
P1.5/CEX2/MISO P1.7/CEX4/MOSI
P1.6/CEX3/SCK
P0_0 P0_2 P0_4 P0_6
P0_1 P0_3 P0_5 P0_7P2_6
P2_0 P2_2 P2_4
P2_1 P2_3 P2_5 P2_7
LED_0
LED_1
LED_2
LED_3
LED_4
LED_5
LED_6
LED_7
PB_0 PB_1 PB_2 PB_3
LED_6
LED_1 LED_3 LED_5 LED_7
LED_0 LED_2 LED_4
PB_2 PB_0 PB_1
PB_3
TWI_hard_scl TWI_hard_sda
OCD_Rx OCD_Tx /PSEN
RST
Port P0 Port P2
LEDs Buttons
OCD
TWI
C11 100nC11 100n
R19 1K R19 1K
R10 10k R10 10k
C5 100nC5 100n
D6D6
2 4 6 8 10
1 3 5 7 9
J5
HEADER 5X2
J5
HEADER 5X2
C6 100n C6 100n
2 4 6
1 3 5
J4
HEADER 3X2
J4
HEADER 3X2
R20 1K R20 1K
D3D3
C2 100n C2 100n
D7D7 D10D10
SW7SW7
R21 1K R21 1K
2 4 6 8 10
1 3 5 7 9
J10
HEADER 5X2
J10
HEADER 5X2
D5D5
R16 1K R16 1K
R15 1K R15 1K
2 4 6 8 10
1 3 5 7 9
J6
HEADER 5X2
J6
HEADER 5X2
R14 1K R14 1K
C9 100n C9 100n
R13 10k R13 10k
SW6SW6
C7 100n C7 100n
SW5SW5
1 2 3 4
J9 SIP4 J9 SIP4
C8 100n C8 100n
C10 100n C10 100n
D9D9
C4 100n C4 100n
D8D8
C3 100n C3 100n
C12 100n C12 100n
2 4 6
1 3 5
J8
HEADER 3X2
J8
HEADER 3X2
R11 10k R11 10k
R18 1K R18 1K
R17 1K R17 1K
SW4SW4
R12 10k R12 10k
1 2 3 4 5 6
J7
SPI Male
J7
SPI Male
D4D4