NJU6624C データシートの表示（PDF） - Japan Radio Corporation

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NJU6624C

14-CHARACTER 1-LINE DOT MATRIX LCD CONTROLLER DRIVER with SMOOTH SCROLL FUNCTION

Japan Radio Corporation  

NJU6624C

-Key status fetching timing

Key status is fetched at third quarter of “L” period (tKP) of scan signals (S0 to S7) as shown below;

S0

tKP

VLCD2

VSS

S1

tKP

3/4tKP

3/4tKP

Fetching timing

-Keyscan data format

Scaned 8-bit data of key are read out through the srial I/F.

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

MS1 MS0 1 0 0 1 1 1 KL3 KL2 KL1 KL0 0 KH2 KH1 KH0

| K3 to K0 | | S7 to S0 |

Keyscan

output data

S7

S6

S5

S4

S3

S2

S1

S0

KH2

1

1

1

1

0

0

0

0

KH1

1

1

0

0

1

1

0

0

KH0

1

0

1

0

1

0

1

0

When a key on the key matrix is pressed, the bit corresponding to terminals (K3 to K0, S7 to S0) connected the

switch goes to “1” and another bits go to “0”.

In case of Example 1, when the switch connecting to K2 and S2 is pressed, bit(D6) corresponding to K2 and

bit(D1) corresponding to S2 go to “1” but another bits go to “0”.

Example 1. One key is pressed

NJU6624

K3 K2 K1 K0 S7 S6 S5 S4 S3 S2 S1 S0

ON

OFF

Read out data

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

MS1 MS0 1 0 0 1 1 1 0 1 0 0 0 0 1 0

| K3 to K0 | | S7 to S0 |

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