UPD77533 datasheet(28/104 Pages) RENESAS

28 / 104 page

Data Sheet S15671EJ4V0DS

µµµµPD77533

5.1.3 TXACTV control

Command: TXACTV Control (CMD-ID: 0x07)

For details of TXACTV control, see 6.4 TXACTV Control.

The initial value is “No TXACTV control”.

To avoid degradation of the GPS reception signal due to PDC/PHS RF output noise or noise from another such

source, input a signal to the TXACTV input pin indicating that PDC/PHS signals are being transmitted and change

this setting to “TXACTV control used” using the TXACTV Control command (CMD-ID: 0x07). By doing this, the A/D

converter output value when the TXACTV input signal = 1 (PDC/PHS transmission in progress) is masked by 0x0 in

the

µPD77533.

5.1.4 Doppler search range

Command: “Doppler Search Range” (CMD-ID: 0x57)

The Doppler search range setting value differs depending on the frequency and accuracy of the reference clock

and the local clock used. For details of how to calculate the Doppler search range (calculation formula), see 6.1.3

Doppler Search Range.

5.1.5 Flow point output

Command: Flow Point Control (CMD-ID: 0x7F)

The initial value of the flow point output is “Flow point output not controlled”.

The output of the Processing End flow point must be set to ON in order for the

µPD77533 to notify the host CPU

that all positioning is complete.

For flow point details, see 17.1 Flow Point Control.

UPD77533 Datasheet(PDF) 28 Page - Renesas Technology Corp