HCTL-2032 Datasheet, PDF (19/21 Pages) Agilent(Hewlett-Packard) – Quadrature Decoder/Counter Interface ICs

Set Portb.4
Reset Portb.5
Reset Portb.6
‘EN1=1
‘EN2=0
‘Select X-axis
Result_new = 0
Result_old_x = 0
Result_old_y = 0
Do
Set Portb.0
Waitms 25
‘Disable OE
Reset Portb.1
Set Portb.3
Reset Portb.0
‘SEL1=0 (MSB)
‘SEL2=1 (MSB)
‘Enable OE
Gosub Get_hi
‘Get MSB
Set Portb.1
Set Portb.3
‘SEL1=1 (2nd Byte)
‘SEL2=1 (2nd Byte)
Gosub Get_2nd
Reset Portb.1
Reset Portb.3
‘Get 2nd Byte
‘SEL1=0 (3rd Byte)
‘SEL2=0 (3rd Byte)
Gosub Get_3rd
‘Get 3rd Byte
Set Portb.1
Reset Portb.3
Gosub Get_lo
Set Portb.0
Waitms 25
Mult = 1
Temp = Result_lo * Mult
Result = Temp
Mult = Mult * 256
Temp = Result_3rd * Mult
Result = Result + Temp
Mult = Mult * 256
Temp = Result_2nd * Mult
Result = Result + Temp
Mult = Mult * 256
Temp = Result_hi * Mult
Result = Result + Temp
‘
Result = 32-bits Count Data
‘
‘SEL1=1 (LSB)
‘SEL2=0 (LSB)
‘Get LSB
‘Disable OE
‘Assign LSB
‘Assign 3rd Byte
‘Assign 2nd Byte
‘Assign MSB
Loop
Figure 18. Typical Program for Reading HCTL-2032 with Atmel AVR
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