Appendix B Magic-
a
1. Function
1) Stand-by
Oscillation is stop
Output of D0~D3 is L , output of D4,D5 is H
2) Condition of stand-by mode
After reset
When scan strobe output is over, there is not any key input.
3) Release of stand-by mode
One of the key scan input (K0~K3, R0~R3) is change to L level
2. Key Input
1) Key-data mapping table
Input pin
Output pin
K0
1
K1
2
K2
3
K3
4
R0
5
R1
6
R2
7
R3
8
D0
D1
D2
D3
9
10
18
26
11
19
27
12
20
28
13
21
29
14
22
30
15
23
31
16
24
32
17
25
2) Double action key
Combi of Key
K21 + K22
Key Data
35h
K21 + K23
36h
K21 + K24
37h
B - 2