UPD77533 datasheet(23/104 Pages) RENESAS

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Data Sheet S15671EJ4V0DS

µµµµPD77533

4.2.1 Character timeout setting

The initial value of the character timeout timer value is 0 (timeout not detected) (see Table 3-2 Initial Values of

Internal Parameters).

It is therefore recommended to get the host CPU to set this timer to a value other than 0 immediately after the

µPD77533 (GPS receiver) is activated (see Figure 3-3 Host CPU Processing Procedure at µµµµPD77533 Startup).

The flow for setting the character timeout timer value is shown in Figure 4-5 below.

The timer value can be set to a time within a range of 0 to 16777215 ms. Note that timeout processing is not

performed if the timer value is set to 0.

Figure 4-5. Character Timeout Timer Setting

PD77533

Host CPU

Timer value setting

Character timeout (timer value)

4.2.2 Character timeout operation

The timeout operation that occurs as a result of the character timeout settings in 4.2.1 is shown in Figure 4-6

below. After discarding the command data received up to the interruption, the

µPD77533 sends the host CPU the

Error Status command (CMD-ID: 0x3F).

Figure 4-6. Character Timeout Occurrence

PD77533

Host CPU

Command data

interruption detected,

timer operating,

waiting for packet

continuance

Command (up to data received

before interruption)

Previous command

re-sent

Command

Timer timeout

Received data discarded

Error Status (Timeout Error)

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