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ST7920 Datasheet(PDF) 30 Page - Sitronix Technology Co., Ltd.

No. de pieza ST7920
Descripción Electrónicos  Chinese Fonts built in LCD controller/driver
PDF  49 Pages
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Fabricante Electrónico  SITRONIX [Sitronix Technology Co., Ltd.]
Página de inicio  http://www.sitronix.com.tw
Logo SITRONIX - Sitronix Technology Co., Ltd.

ST7920 Datasheet(HTML) 30 Page - Sitronix Technology Co., Ltd.

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ST7920
V4.0
30/49
2008/08/18
Testing Step:
1.
Clear whole DDRAM area by writing data 0x00.
2.
Composing TT1 and TT2 to make the
‘Reset’ action, and clear the internal counter.
3.
Selecting the test mode by setting TT1 and TT2 (CGROM or HCGROM).
4.
After setp1 and setp2, entering some impulse signals through Pin4 (CLK).
5.
Reading the CHECK SUM data through D0 to D7.
6.
Comparing CHECK SUM with the Code Table (upper table) to check if the data is correct or not.
TT1
TT2
No. of counts
Status
1
1
--
RESET
0
1
655362
CGROM
1
0
10242
HGROM
Test process flow:



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