gl846 Genesys Logic, gl846 Datasheet - Page 51

• Manufacturer Part Number: gl846
• Description: High Speed Usb 2.0 2-in-1 Scanner Controller With Fast 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
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
GL846 High Speed USB2.0 2-in-1 Scanner Controller With Fast ADF
{a + (b-1)} mode {LPERIOD * (CCDLMT+1)} = Z2MOD
{c + (d-1)} mode {LPERIOD * (CCDLMT+1)} = Z1MOD
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
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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