Boards User I/O Connections

Following is a table showing the off board connections, and how they relate to the MBED board, and further on to the CPU,, Also users should be aware that the I/O pins of the CPU, are multiplexed, hence the columb on the end for the IO element

ConnectionMBED PinBoard Use LPC1768 PinLPC1768 portLPC1768 line LPC1768 IO element
GND
1  
 
GPIO (I2C) P0
PCF8574
 
GPIO (I2C) P1
PCF8574
 
GPIO (I2C) P2
PCF8574
 
GPIO (I2C) P3
PCF8574
 
GPIO (I2C) P4
PCF8574
 
GPIO (I2C) P5
PCF8574
 
GPIO (I2C) P6
PCF8574
 
GPIO (I2C) P7
PCF8574
 
+5v
2
 
GND
1
 
P20
20Analog (AI3)
20
1
31
2
P19
19Analog In
21
1
30
3
P18
18Analog Out
6
0
26
1/2
P17
17Analog (AI2)
7
0
25
1
P16
16Analog (AI1)
8
0
24
1
P15
15Analog (AI0)
9
0
23
1
P14
14RS232 RX
63
0
16
1
P13
13RS232 TX
62
0
15
1
P12
12GPIO
61
0
17
0
P11
11GPIO
60
0
18
0
P10
10I2C SCL
47
0
1
3
P9
9I2C SDA
46
0
0
3
P8
8GPIO
79
0
6
0
P7
7SCLK
78
0
7
2
P6
6MISO
77
0
8
2
P5
5MOSI
76
0
9
2
P21
21GPIO
68
2
5
0
P22
22GPIO
69
2
4
0
P23
23GPIO
70
2
3
0
P24
24GPIO
73
2
2
0
P25
25GPIO
74
2
1
0
P26
26GPIO
75
2
0
0
P27
27SDCS
49
0
11
0
P28
28CAN CS
48
0
10
0
P29
29CAN TX
80
0
5
2
P30
30CAN RX
81
0
4
2
+5v
2 
 
 
 
 
+3.3v
40 
 
 
 
 
Reset
4 
17
 
 
 
GND
1 
 
 
 
 
LED1
 LED
32
1
18
0
LED2
 LED
34
1
20
0
LED3
 LED
35
1
21
0
LED4
 LED
37
1
23
0
USB RX
 MBED USB RX
99
0
3
1
USB TX
 MBED USB TX
98
0
2
1

pcc@cs.york.ac.uk
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