UPD77533 datasheet(29/104 Pages) RENESAS

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Data Sheet S15671EJ4V0DS

µµµµPD77533

5.2 RF Block ON

When positioning starts, the

µPD77533 automatically controls the external pins ADSCK, RFON, AGC, and

DCOFF as follows, and switches on the RF block. Specifically, the

µPD77533 performs the following.

• Start of ADSCK signal output

• RFON = 1 (down converter power on)

• Start of AGC, DCOFF signal output

5.2.1 AGC and DCOFF output signals

The values of the AGC and DCOFF output signals are shown in Table 5-1, together with the corresponding

TXACTV input signal values and ADDI3 to ADDI0 input signal values (values input from A/D converter; 4 bits).

DCOFF is a feedback signal to the RF block and is used to adjust the RF offset. AGC is a feedback signal to the

RF block and is used to adjust the RF gain.

When TXACTV is 1 (PDC/PHS transmitting), both DCOFF and AGC are high-impedance output, regardless of the

value input from ADC.

Table 5-1. Output Values of AGC and DCOFF

TXACTV

(Input Signal)

ADDI3 to ADDI0

(Values Input from A/D Converter)

DCOFF

(Output Signal)

AGC

(Output Signal)

All cases

High-impedance

0b1111

0b1110

0b1101

0b1100

0b1011

0b1010

0b1001

0b1000

High-impedance

0b0111

0b0110

0b0101

0b0100

0b0011

0b0010

0b0001

0b0000

5.3 GPS Signal Reception (SnapShot Execution)

The

µPD77533 executes GPS signal reception. Details of this processing are not available to users.

• The SnapShot execution time is set to the time specified by the host CPU or the server command “$JM”.

• The signal processing operation during SnapShot execution (the “status” parameter) becomes “SnapShot in

progress”.

• The signal processing operation at the end of SnapShot execution (the “status” parameter) becomes “Idling”.

Remark See Table 3-2 Initial Values of Internal Parameters for details of the status parameter.

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