ADNS-2051 Avago Technologies US Inc., ADNS-2051 Datasheet - Page 25

• Manufacturer Part Number: ADNS-2051
• Description: Optical Mouse Sensor,DIP
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-2051

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q2072083C

25
Resync_sensor:
;
;
;
;
;
;
;
;
;
;
ReadSPI:
Waitrspi:
Waitrspi2:
ReadSPI routine
Includes delays for long traces or cables between the uP and ADNS-2051
Has correct timing of SCLK and SDIO
On entry:
VSLBGDWD
2Q H[LW
spi_data = register contents from ADNS-2051
XQGH¿QHG
mov A,~(SCLK|SDIO|PD)
and [port1_wrote], A
mov A, [port1_wrote]
iowr Port1_Data
call delay700us
call delay700us
call delay700us
call delay700us
call delay700us
call delay700us
mov A, (SCLK|SDIO|PD
or [port1_wrote], A
mov A, [port1_wrote]
iowr Port1_Data
call delay700us
mov A, ~PD
and [port1_wrote], A
mov A, [port1_wrote]
iowr Port1_Data
call delay700us
call delay700us
call delay700us
call delay700us
call delay700us
call delay700us
spi_addr = Address of SPI register in the ADNS-2051
VSLBDGGU
mov A, 64
mov [bit_counter], A
nop
nop
nop
nop
nop
nop
dec [bit_counter]
jnz Waitrspi
mov A,~80h
and [spi_addr], A
call writeaddr
mov A,64
mov [bit_counter], A
nop
nop
nop
nop
nop
nop
dec [bit_counter]
jnz Waitrspi2
mov A, 0h
XQGH¿QHG
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
;
set the SCLK, SDIO and PD lines low
If the power to the sensor needs more time
to stabilize, insert a delay here
wait about 4 milliseconds for the sensor
oscillator to stabilize
set the SCLK, SDIO and PD lines high
this shuts down the oscillator and
resets the SPI port
wait for the PD to reset the part
set the PD line low to put the sensor
back into normal operation
wait about 4 milliseconds for the sensor
oscillator to stabilize
sensor SPI port now in sync
wait 200us (optional)
(about 3us per loop)
read address
lower MSB of address (read)
wait 200us (about 3us per loop)(100us minimum required)
wait for data to be ready
clear the data