Canon EF User Manual download pdf (Page 7)

Lens Pin-out

• Protocol: SPI (serial peripheral interface)

– 8 data bits, 1 stop bit

VBAT

P-GND

D-GND

CLK

VBAT: 6V power for lens motors

P-GND: Ground for lens motors

VDD: 5.5V power for digital logic

DCL: Data from camera to lens (MOSI)

DLC: Data from lens to camera (MISO)

CLK: Clock

D-GND: Ground for digital logic

VDD

DLC DCL

MOSI: master output, slave input

MISO: master input, slave output

master: camera in this case

slave: lens in this case

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