UPD77533 datasheet(50/104 Pages) RENESAS

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Data Sheet S15671EJ4V0DS

µµµµPD77533

15. SERVER COMMANDS

The

µPD77533 supports the following server commands.

Table 15-1. List of Server Commands

Command Name

Command ID

Function

Module ID/Version

CA, ca

Obtains the unit ID and software version information

Module Processing Status Request

BB, bb

References the status of the LSI and positioning

Module Reset

IA, ia

Resets the GPS module

Send Processed Result

Sends notification of the positioning result

Multi Fix

JM, jm

Specifies positioning

Ping for Coarse Time

Synchronization

PJ, pj

Course time synchronization.

First command for positioning

session.

Set Adaptive Parameters

AC, ac

Sets various parameters related to positioning

Set SnapShot Duration

DA, da

Command used to verify the functions of the

µPD77533Note 1

(SnapShot time setting)

Take SnapShot

EA, ea

Command used to verify the functions of the

µPD77533Note 1

(SnapShot execution)

Send SnapShot Data

FA, FC, fa, fb, fc

Command used to verify the functions of the

µPD77533Note 1

(SnapShot data (1 ms Frame) acquisition)

Set Baud Rate

BD, bd

Sets connection speed between host CPU and LS

Note 2

Request for Service

CB, cb

Sends notification of start of positioning at calling receiver

Notes

These commands are not required for normal positioning operations.

This command is processed by the host CPU; command processing by the

µPD77533 is not

required.

15.1 Handling of Server Commands by Host CPU

With a few exceptions, the host CPU simply acts as the mediator when server commands are communicated

between the

µPD77533 and the LS. Specifically, the host CPU performs the following processing.

• Packets server commands sent from the LS and transfers them to the

µPD77533.

• De-packets responses sent from the

µPD77533 and transfers them to the LS.

• Changes the baud rate upon recognition of the baud rate change server command and sends a response.

• Performs ACK and NACK processing in communication between the

µPD77533 and the host CPU.

In order to perform the above processing, the host CPU must analyze server commands and responses.

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