Optical navigation system and optical sensor control method

1. An optical navigation system, comprising:

a control circuit; and

an optical sensor, comprising a plurality of pins, wherein the optical sensor is configured to sense optical data and configured to compute motions according to the optical data;

wherein the optical sensor outputs the motions to the control circuit via a complex pin among the pins in a first mode;

wherein the optical sensor outputs data other than the motions to the control circuit via the complex pin in a second mode.

2. The optical navigation system of claim 1 , wherein the optical sensor follows a SPI specification and the complex pin is a MISO pin.

3. The optical navigation system of claim 2 , wherein the optical sensor further comprises a NCS pin, a SCLK pin, and a MOSI pin.

4. The optical navigation system of claim 1 , wherein one of the plurality of pins inputted as a first level defines the first mode.

5. The optical navigation system of claim 4 , wherein the one of the plurality of pins inputted as a second level defines the second mode.

6. An optical navigation system, comprising:

a control circuit; and

an optical sensor, comprising a plurality of pins;

wherein the optical sensor receives first type data from the control circuit via a complex pin among the pins in a first mode;

wherein the optical sensor receives second type data from the control circuit via the complex pin in a second mode.

7. The optical navigation system of claim 6 , wherein the optical sensor follows a SPI specification and the complex pin is a MOSI pin.

8. The optical navigation system of claim 7 , wherein the complex pin operates as the MOSI pin in the first mode, and receives the second type data in the second mode.

9. The optical navigation system of claim 7 , wherein the optical sensor further comprises a NCS pin, a SCLK pin, and a MISO pin.

10. The optical navigation system of claim 6 , wherein the second type data is a trigger signal for waking up the optical sensor.

11. The optical navigation system of claim 10 , wherein the trigger signal is used for immediately waking up the optical sensor.

12. An optical sensor control method, applied to an optical sensor comprising a plurality of pins, comprising:

sensing optical data and computing motions according to the optical data, by the optical sensor;

outputting the motions via a first complex pin among the pins in a first mode, by the optical sensor; and

outputting data other than the motions to the control circuit via the first complex pin in a second mode, by the optical sensor.

13. The optical sensor control method of claim 12 , wherein the optical sensor follows a SPI specification and the first complex pin is a MISO pin.

14. The optical sensor control method of claim 13 , wherein the optical sensor further comprises a NCS pin, a SCLK pin, and a MOSI pin.

15. The optical sensor control method of claim 12 , further comprising:

receiving first type data from the control circuit via a second complex pin among the pins in a third mode;

receiving second type data from the control circuit via the second complex pin in a fourth mode.

16. The optical sensor control method of claim 15 , wherein the optical sensor follows a SPI specification and the second complex pin is a MOSI pin.

17. The optical sensor control method of claim 16 , further comprising:

using the second complex pin as the MOSI pin in the third mode, and receiving the second type data via the second complex pin in the fourth mode.

18. The optical sensor control method of claim 16 , wherein the optical sensor further comprises a NCS pin, a SCLK pin, and a MISO pin.

19. The optical sensor control method of claim 16 , wherein the second type data is a trigger signal for waking up the optical sensor.

20. The optical sensor control method of claim 19 , wherein the trigger signal is used for immediately waking up the optical sensor.