HCTL-2032 Datasheet, PDF (17/20 Pages) Agilent(Hewlett-Packard) – Quadrature Decoder/Counter Interface ICs

Interfacing the HCTL-2032 to an Atmel AVR 90S8535
The circuit shown in Figure 17 shows the connections between an HCTL- 2032 and an Atmel AVR
controller. Data lines D0- D7 are connected to the Atmel AVR bus port. The 8 MHz oscillators clock
the Atmel AVR, whereas the external 33 MHz oscillators clock the HCTL- 2032. Figure 18 illustrates
the program that interfaces with an Atmel AVR 90S8535.
+5v
R= 2.7kOHM
R
R
R
5 CHB
4 VCC
3 CHA
2 CHI
1 GND
+5v
R= 2.7kOHM
R
R
R
5 CHB
4 VCC
3 CHA
2 CHI
1 GND
CHBX
CHAX
CHIX
CHBY
CHAY
CHIY
HCTL2032
D0
D1
D2
D3
D4
D5
D6
D7
SEL1
SEL2
EN1
EN2
OE
RSTX
RSTY
X/Y
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PB1
PB3
PB4
PB5
PB0
PB2
PC7
PB6
Figure 17. An HCTL-2032-to-Atmel AVR Interface
AT90S8535
17