AOC Vibrant VL7A9DA Service Manual page 59

2.7.1 Serial Communication Protocol
In the serial communication between the microcontroller and the gmZAN1, the mic rocontroller always acts as an
initiator while the gmZAN1 is always the target. The following timing diagram describes the protocol of the serial
channel of the gmZAN1 chip.
Figure 10. Timing Diagram of the gmZAN1 Serial Communication