SM5221-001/002
32 KEYS ENCODER
SAMHOP Microelectronics Corp.
DOUBLE KEY OPERATION
When more than two keys except K21 + K22, K21 +K23 and K21 +K24 are depressed at the
same time, the transmission output stops.
Double key operation is useful for tape deck recording operation.
Double key operation form are following.
KEY
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D7
K21 + K22
K21 + K23
K21 + K24
1
0
1
0
1
1
1
1
1
0
0
0
1
1
1
1
1
1
0
0
0
0/1
0/1
0/1
(a) Operation
K21 Transmission
t > 126 ms
D5+K22 to 24 Transmission
K21
push
K22 to K24
push
(b) No operation
K21 Transmission
36 ms < t < 126 ms
No Transmission
K21
K22 to K24
(c) No operation
No transmission
K21
-36 ms < t < 36 ms
K22 to K24
(d) No operation
K21
t > 126 ms
K22 to K24
K22 to 24 Transmission
No Transmission
Page 11
V.2.0 Mar 8,2002
SAMHOP [ SAMHOP MICROELECTRONICS CORP. ]
