gl845 Genesys Logic, gl845 Datasheet - Page 90

• Manufacturer Part Number: gl845
• Description: High Speed Usb 2.0 2-in-1 Scanner Controller With Adf
• Manufacturer: Genesys Logic

33 Support LCM Interface
GL845 supports LCM display interface via internal logic circuitry. Programmers need to set the LCMSEL
control bit to logic ‘1’. GPIO19 controls RS of LCM. GPIO20 controls EN of LCM.
GPIO1~4 control the data bus of LCM and share the input of keys matrix. GPIO18 controls the /E of external
74HC244.
The 74HC244 is a bus buffer to share keys matrix and LCM data bus.
Following is the application of keys matrix & LCM display.
©2000-2007 Genesys Logic Inc. - All rights reserved.
G L 8 4 5
G L 8 4 5
G L 8 4 5
G L 8 4 5
G P IO 1 3 ~ 1 5
GL845 High Speed USB2.0 2-in-1 Scanner Controller With ADF
G PIO 1 ~ 4
G P IO 2 9
G P IO 3 0
G P IO 1 8
G P IO 1 9
G P IO 2 0
4
R C K
S C K
S I
sh ift reg ister
7 4 H C 5 9 5
3
C 1
C 2
S1 ~ 7
M atrix
K ey s
L C D
3 x 4
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