
GL841 USB 2.0 2-in-1 Scanner Controller
32. Reg : 25H,26H,27 H (Read/Write)
Default : 00H,00H,00H
LINCNT[19:0]: to set the scan lines number.
Note: can not be programmed to logic zero.
33. Reg : 28H (Read/Write)
Default : 00H
GMMWRDATA : this port to write gamma table.
34. Reg : 29H (Read/Write)
Default : FFH
LAMPPWM[7:0] : to set PWM duty for lamp power control.
0: 1/256 duty.
1: 2/256 duty.
…..
255:256/256 duty.
35. Reg : 2AH,2BH (Read/Write)
Default : 00H.00H
RAMADDR[15:0] : to set DRAM start address to access data.
note: IRAM_A[19:0]={RAMADDR[15:0],4’b0000}.
36. Reg : 2CH,2DH (Read/Write)
Default : 00H,00H
DPISET[10:0] : set resolution of DPI for average type or deletion type.
A. average type : digital average function support 1/2,1/3,1/4,1/5,1/6,1/8,1/10,1/12,1/15.
a. 2400 dpi scanner : can set 1200,800,600,480,400,300,240,200,160 dpi.
b. 1200 dpi scanner : can set 600,400,300,240,200,150,120,100,80 dpi.
c. 600 dpi scanner : can set 300,200,150,120,100,75,60,50 and 40 dpi.
B. deletion type : 2400,1200 or 600dpi to 1 dpi setting decrement by one dpi.
Note: can not be programmed to logic zero.
37. Reg : 2EH (Read/Write)
Default : 00H
BWHI[7:0]
: to set Black & White threshold high level.
38. Reg : 2FH (Read/Write)
Default : 00H
BWLOW[7:0] : to set Black & White threshold low level.
BWHI
d
BWLOW b c e f i bandwidth
g
a
Note: can not be programmed to logic zero.
h
Version 1.7
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