UPD77533 datasheet(30/104 Pages) RENESAS

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Data Sheet S15671EJ4V0DS

µµµµPD77533

5.4 RF Block OFF

The

µPD77533 switches off the RF block after receiving the GPS signal. Specifically, the µPD77533 performs the

following.

• ADSCK signal output stopped

• RFON = 0 (down converter power off)

• AGC, DCOFF signal output stopped

5.5 Pseudo Range Calculation

The

µPD77533 calculates the pseudo range using the received GPS signal.

5.6 Positioning Result Notification

The

µPD77533 issues the server command “!hd” after calculating the pseudo range and notifies the LS of the

result via the host CPU.

5.7 Positioning End Notification

The

µPD77533 sends the Processing End command (CMD-ID: 0x7F) after all positioning has finished to inform

the host CPU that all positioning is complete.

Note that it is necessary to set flow point output control to ON using the Flow Point Control command (CMD-ID:

0x7F) before starting positioning.

Be aware that the initial value of the Flow Point Control command (CMD-ID: 0x7F) is “Flow point output not

controlled”.

After receiving this response, the host CPU can perform processing such as switching off the power of the

peripheral modules (such as the Mobile specified RAM).

5.8 Commands That Cannot Be Sent During Positioning

The commands that the host CPU is prohibited from sending while the

µPD77533 is performing positioning are

shown in Table 5-2.

Table 5-2. Commands That Cannot Be Sent During Positioning

Command Type

CMD-ID

Command

Local command

0x01

Baud Rate Change

0x05

RF Power Control

0x06

Frequency Calibration Control

0x07

TXACTV Control

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