MOTG-96 datasheet(7/42 Pages) ETC2

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MOTG-96

Data Sheet

Software Interface

The MOTG-96 display module is a slave peripheral device and it provides bidirectional communications to a

host controller via its SPI interface. All communications between the host and the device occur over this SPI

interface. The protocol is simple and easy to implement.

 Note:ThehostmustinitialiseitsSPIportasthemasterandmustmeettheMOTGSPIspecifications

outlined in the previous section.

3.1 Command Protocol – Flow Control

The MOTG modules are slave devices and all communication and events must be initiated by the host. Each

command is made up of a sequence of data bytes. When a command is sent to the device and the

operation is completed, it will always return a response. For a command that has no specific response the

device will send back a single acknowledge byte called the ACK (06hex), in the case of success, or NAK

(15hex), in the case of failure.

Commands having specific responses may send back varying numbers of bytes, depending upon the

command and response. It will take the device a certain amount of time to respond, depending on the

command type and the operation that has to be performed. If the MOTG device receives a command that it

does not understand it will reply back with a negative acknowledge called the NAK (15hex). Since a

command is only identified by its position in the sequence of data bytes sending incorrect data can result in

wildly incorrect operation.

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