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Data Sheet S15671EJ4V0DS

µµµµPD77533

11. COMMAND TYPES AND RESPONSES

The

µPD77533 executes the commands received from the host CPU or LS and returns a response. Commands

issued from the LS are called server commands and those issued by the host CPU are called local commands. The

command acknowledgement issued from the

µPD77533 to the LS or host CPU is called a response.

11.1 Commands

The following three types of commands are used.

Table 11-1. Command Types

Type

Issued by

Function

Local command

Host CPU

Used for setting, controlling, and obtaining the current status of the

µPD77533. These commands are issued by the host CPU, which also

receives the response from the

µPD77533. The LS is not involved in this

operation.

Extension command

Host CPU

Provided to extend the local commands. These commands are issued by

the host CPU, which also receives the response from the

µPD77533. The

LS is not involved in this operation.

Server command

Used for positioning. These commands are issued by the LS, which also

receives the response from the

µPD77533. The host CPU converts the data

format

(into/from

packets)

and

operates

the

mediator

the

command/response communication between the

µPD77533 and the LS.

Some server commands must also be processed the host CPU.

Figure 11-1. Relationship Between Commands and Function Blocks

11.2 Responses

There are two types of responses: those sent in response to a command, and those sent by the

µPD77533

spontaneously.

For the former, there is not necessarily one response per command; there are commands for which multiple

responses are returned, or for which no response is returned.

For the latter, the response transmission timing is undefined, so the host CPU must always be in a state in which it

can receive responses from the

µPD77533.

12. PACKET AND COMMAND FORMAT

Data is transferred between the

µPD77533 and the host CPU in the form of packets.

The data is 8-bit binary data (little endian), and does not necessarily consist only of ASCII characters.

PD77533

Host CPU

Server command

Mediates server command communication,

including performing packet/de-packet processing

Server command

Local command,

extension command

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