Atmel AT89C51ED2 - Page 19

Appendix C: Board Schematics
AT89STK-11 Hardware User Guide 4-18
7676B–8051–08/07
Figure 4-4. AT89STK-11 Schematics (3 of 4)
XTAL2 XTAL1
VccVcc_cpu
Vcc_cpuVcc
Vcc
Vcc
P0_0 P0_1 P0_2 P0_3 P0_4 P0_5 P0_6 P0_7
P1.0/T2
P1.1/T2EX/SS
P1.2/ECI
P1.3/CEX0 P1.4/CEX1
P1.6/CEX3/SCK P1.7/CEX4/MOSI
P2_0 P2_1 P2_2 P2_3 P2_4 P2_5 P2_6 P2_7 P3_0/RxD P3_1/TxD P3_2/INT0 P3_3/INT1 P3_4 P3_5 P3_6 P3_7 /ALE /PSEN
/EA
RST
TWI_hard_sda TWI_hard_scl
P1.5/CEX2/MISO
OCD_Rx
OCD_Tx
XTAL1
XTAL2
P0_0 P0_1 P0_2 P0_3 P0_4 P0_5 P0_6 P0_7
TWI_hard_scl TWI_hard_sda
/EA
XTAL1 XTAL2
/ALE
P0_0 P0_1 P0_2 P0_3 P0_4 P0_5 P0_6 P0_7
OCD_Rx OCD_Tx RST
P1.0/T2
P1.1/T2EX/SS
P1.2/ECI P1.3/CEX0 P1.4/CEX1 P1.5/CEX2/MISO
P1.6/CEX3/SCK
P1.7/CEX4/MOSI /PSEN
P3_0/RxD
P3_1/TxD
P3_2/INT0 P3_3/INT1
P3_4 P3_5 P3_6 P3_7
PB_1 PB_0
PB_3
PB_2
LED_6
LED_1 LED_3 LED_5 LED_7
P2_0 P2_1 P2_2 P2_3 P2_4 P2_5 P2_6 P2_7
LED_0 LED_2 LED_4
Expansion Connector
R105 4.7KR105 4.7K R104 4.7KR104 4.7K
Y1Y1
R103 4.7KR103 4.7K
SP6SP6
RST
10
XTAL2
20
XTAL1
21
GND
22
PSEN
32
ALE/PROG
33
EA/VPP
35
VCC
44
P1.0
2
P1.1
3
P1.2
4
P1.3
5
P1.4
6
P1.5
7
P1.6
8
P1.7
9
P2.0/A8
24
P2.1/A9
25
P2.2/A10
26
P2.3/A11
27
P2.4/A12
28
P2.5/A13
29
P2.6/A14
30
P2.7/A15
31
P3.0/RXD
11
P3.1/TXD
13
P3.2/INT0
14
P3.3/INT1
15
P3.4/T0
16
P3.5/T1
17
P3.6/WR
18
P3.7/RD
19
P0.0/AD0
43
P0.1/AD1
42
P0.2/AD2
41
P0.3/AD3
40
P0.4/AD4
39
P0.5/AD5
38
P0.6/AD6
37
P0.7/AD7
36
Rx_OCD
1
RxD_1/SDA
12
TxD_1/SCL
34
Tx_OCD
23
U6 AT8xC51_PLCC44 U6 AT8xC51_PLCC44
R102 4.7KR102 4.7K
SP2SP2
R101 4.7KR101 4.7K
C13
100n
C13
100n
R100 4.7KR100 4.7K
SP12SP12
SP11SP11
CD6 100n CD6 100n
CD7 100n CD7 100n
C15 22pF C15 22pF
C14 22pF C14 22pF
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62
1 3 5 7 9
11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61
J3
HEADER 31x2/SM
J3
HEADER 31x2/SM
SP8SP8
R107 4.7KR107 4.7K
SP10SP10
SP7SP7
R106 4.7KR106 4.7K
SP9SP9 SP5SP5