NJU6624 New Japan Radio Co., Ltd., NJU6624 Datasheet - Page 11

• Manufacturer Part Number: NJU6624
• Description: 12-character 1-line Dot Matrix LCD Controller Driver with Smooth Scroll Function
• Manufacturer: New Japan Radio Co., Ltd.

-Key status fetching timing
-Key status fetching timing
When a key on the key matrix is pressed, the bit corresponding to terminals (K3 to K0, S7 to S0) connected the
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”.
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
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”.
bit(D1) corresponding to S2 go to “1” but another bits go to “0”.
Example 1. One key is pressed
Example 1. One key is pressed
-Keyscan data format
-Keyscan data format
Scaned 8-bit data of key are read out through the srial I/F.
Scaned 8-bit data of key are read out through the srial I/F.
Read out data
Read out data
Key status is fetched at third quarter of “L” period (tKP) of scan signals (S0 to S7) as shown below;
Key status is fetched at third quarter of “L” period (tKP) of scan signals (S0 to S7) as shown below;
S0
S0
S1
S1
D15 D14 D13 D12 D11 D10
MS1
D15 D14 D13 D12 D11 D10
MS1
MS0
K3
MS0
output data
K e y s c a n
1
K2
S 7
S 6
S 5
S 4
S 3
S 2
S 0
S 1
1
K1
0
3/4tKP
3/4tKP
K0
0
0
tKP
tKP
S7
NJU6624
0
1
Fetching timing
Fetching timing
S6
K H 2
1
S5
D9
0
0
0
0
1
1
1
1
1
3/4tKP
3/4tKP
S4
D9
1
D8
1
tKP
tKP
S3
D8
1
|
D7
0
S2
K H 1
0
0
0
0
1
1
1
1
KL3 KL2 KL1 KL0
|
D7
K3 to K0
S1
D6
1
K3 to K0
S0
D6
D5
0
K H 0
D5
D4
0
0
0
0
1
1
1
1
0
OFF
|
ON
D4
D3
0
|
|
D3
VSS
VSS
VLCD2
VLCD2
0
D2
0
S7 to S0
|
NJU6624A/B
NJU6624A/B
KH2 KH1 KH0
D2
S7 to S0
D1
1
D1
D0
0
|
D0
|