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SM5221

32 KEYS ENCODER

Samhop Mircroelectronics 

三合微科股份有限公司

SAMHOP Microelectronics Corp.

SM5221-001/002

32 KEYS ENCODER

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

D0

D1

D2

D3

D4

D5

D6

D7

K21 + K22

1

0

1

0

1

1

0

0/1

K21 + K23

0

1

1

0

1

1

0

0/1

K21 + K24

1

1

1

0

1

1

0

0/1

(a) Operation

K21

push

K21 Transmission

t > 126 ms

D5+K22 to 24 Transmission

K22 to K24

push

(b) No operation

K21

K21 Transmission

36 ms < t < 126 ms

No Transmission

K22 to K24

(c) No operation

K21

-36 ms < t < 36 ms

No transmission

K22 to K24

(d) No operation

K21

t > 126 ms

K22 to K24

K22 to 24 Transmission

Page 11

No Transmission

V.2.0 Mar 8,2002

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