gl845 Genesys Logic, gl845 Datasheet - Page 52

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

©2000-2007 Genesys Logic Inc. - All rights reserved.
Offset 66h ……..………………..………..………..….………..….…..…..…..…. Default value = 8’h00
Offset 67h ……..……..………………..………..….………..….…..………..…. Default value = 8’h7F
Offset 68h ……..……..………………..………..….………..….…..………..…. Default value = 8’h7F
Offset 69h ……..………………..………..………..….………..….…..…..…..…. Default value = 8’h00
7-0 PHFREQ [7:0] PWM frequency for motor phase of unipolar motors
7-6 RESERVED
5-0 MTRPWM [5:0] PWM duty cycle selection of table one, table two and table three of motor phase
7-6 RESERVED
5-0 FASTPWM [5:0] PWM duty cycle selection of table four and table five of motor phase of unipolar
7-0 FSHDEC [7:0] Deceleration steps after scanning finished (table three).
PHFREQ7 PHFREQ6 PHFREQ5 PHFREQ4 PHFREQ3 PHFREQ2 PHFREQ1 PHFREQ0
FSHDEC7 FSHDEC6 FSHDEC5 FSHDEC4 FSHDEC3 FSHDEC2 FSHDEC1 FSHDEC0
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Note: If MCNTSET [1:0] = 01 or 10 or 11, then (each step curve value + 1)/VCNT.
X
X
X
X
GL845 High Speed USB2.0 2-in-1 Scanner Controller With ADF
Then Z1MOD = {(60H + 48H + 30H + 18H) + (18H +18H)} MOD {30H} = 00H
VCNT= system clocks per pixel / (MCNTSET+1).
For example, c (STEPNO
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X
X
X
X
Frequency: (system clock frequency)/[(PHFREQ+1)*4
-
MTRPWM = 0 1/64 duty
Note: If PHFREQ < 0FH, then PWM setting must < (PHFREQ+1)*4
-
FASTPWM = 0 1/64 duty
Note: If PHFREQ < 0FH, then PWM setting must < (PHFREQ+1)*4
Note: It cannot be programmed to logic zero.
of unipolar motors in scanning mode.
motors in scanning mode.
d (FWDSTEP = 3 steps for moving) = 18H, 18H, 18H
LPERIOD
MTRPWM5 MTRPWM4 MTRPWM3 MTRPWM2 MTRPWM1 MTRPWM0
FASTPWM5 FASTPWM4 FASTPWM3 FASTPWM2 FASTPWM1 FASTPWM0
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= 1 2/64 duty
= 2 3/64 duty
……
= 63 64/64 duty
= 1
= 2
……
= 63 64/64 duty
= 4 steps for table 1)
= 30H
2/64 duty
3/64 duty
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= 60H, 48H, 30H, 18H
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