7
Keypad connector
Keypad connector can be used to scan various types of keypads, such as 3 by 5 or 4 by 4. Keypad
connector contains 5 Volt power and ground lines and the 8 port lines of the micro-controller. The lines can
also be used as general-purpose inputs/outputs.
Keypad Connector (J1)
Signal
Pin
P1.16 (KEY0)
1
P1.17 (KEY1)
2
P1.18 (KEY2)
3
P1.19 (KEY3)
4
P1.20 (KEY4)
5
P1.21 (KEY5)
6
P1.22 (KEY6)
7
P1.23 (KEY7)
8
Ground (GND)
9
VCC (+5V)
10
Table 1
Figure 2
