HCTL-2022 View Datasheet(PDF) - Avago Technologies

Part Name

Description

Manufacturer

HCTL-2022

Quadrature Decoder/ Counter Interface ICs

Avago Technologies 

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

19

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