GL848 datasheet(46/85 Pages) GENESYS

46 / 85 page

GL848 High Speed USB2.0 2-in-1 Scanner Controller With Fast ADF

Page 46

time

(2). One table moving :

speed

Scanning position

buffer full position

time

{a + (b-1)} mode {LPERIOD * (CCDLMT+1)} = Z2MOD

{c + (d-1)} mode {LPERIOD * (CCDLMT+1)} = Z1MOD

For example, c (STEPNO

= 4 steps for table 1)

= 60H, 48H, 30H, 18H

d (FWDSTEP = 3 steps for moving)

= 18H, 18H, 18H

LPERIOD

= 30H

CCDLMT

= 0

Then Z1MOD = {(60H + 48H + 30H + 18H) + (18H +18H)} MOD {30H} = 00H

Note: If MCNTSET [1:0] = 01 or 10 or 11, then (each step curve value + 1)/VCNT.

VCNT= system clocks per pixel / (MCNTSET+1).

Offset 66h ……..………………..………..………..….………..….…..…..…..…. Default value = 8’h00

PHFREQ7

PHFREQ6

PHFREQ5

PHFREQ4

PHFREQ3

PHFREQ2

PHFREQ1

PHFREQ0

R/W

7-0 PHFREQ [7:0] PWM frequency for motor phase of unipolar motors

Frequency: (system clock frequency)/[(PHFREQ+1)*4

Offset 67h ……..……..………………..………..….………..….…..………..…. Default value = 8’h7F

MTRPWM5 MTRPWM4 MTRPWM3 MTRPWM2 MTRPWM1 MTRPWM0

R/W

7-6 RESERVED

5-0 MTRPWM [5:0] PWM duty cycle selection of table one, table two and table three of motor phase

of unipolar motors in scanning mode.

MTRPWM = 0

1/64 duty

= 1

2/64 duty

= 2

3/64 duty

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