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UPD7225 Datasheet(PDF) 18 Page - NEC

Part # UPD7225
Description  PROGRAMMABLE LCD CONTROLLER/DRIVER
PDF  52 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD7225 Datasheet(HTML) 18 Page - NEC

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Data Sheet S14308EJ6V0DS00
18
µµµµPD7225
3.
FRAME FREQUENCY AND BLINKING FREQUENCY SETTING
3.1 Frame Frequency Setting
The frame frequency is set according to M1, M0 (number of time-divisions setting), and F1, F0 (frequency division
ratio) as indicated in the figure below.
Figure 3-1. Frame Frequency Setting
Static
Divide- by-2 time
division
Divide- by-3 time
division
Divide- by-4 time
division
M1, M0
F1,F0
0
1
11100
0
00
fCL
2
7
fCL
2
7
× 2
fCL
2
7
× 3
fCL
2
7
× 4
01
fCL
2
8
fCL
2
8
× 2
fCL
2
8
× 3
fCL
2
8
× 4
10
fCL
2
9
fCL
2
9
× 2
fCL
2
9
× 3
fCL
2
9
× 4
11
fCL
2
11
fCL
2
11
× 2
fCL
2
11
× 3
fCL
2
11
× 4
Remark fCL = Clock oscillation frequency
3.2 Blinking Frequency Setting
The blinking frequency can be set in two settings by K0 in the BLINKING ON command.
Figure 3-2. Blinking Frequency Setting
K0
Blinking frequency
0
fCL
2
17
1
fCL
2
16
Remark fCL = Clock oscillation frequency



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