Rainbow-electronics ATmega64M1 Instrukcja Użytkownika Pobierz pdf (Strona 140)

140

8209A–AVR–08/09

ATmega16M1/32M1/64M1

Figure 18-7. Controlled Start and Stop Mechanism in Centered Mode

Note: See “PCTL – PSC Control Register” on page 151.(PCCYC = 1)

18.6 Update of Values

To avoid unasynchronous and incoherent values in a cycle, if an update of one of several values

is necessary, all values are updated at the same time at the end of the cycle by the PSC. The

new set of values is calculated by sofware and the update is initiated by software.

Figure 18-8. Update at the end of complete PSC cycle.

The software can stop the cycle before the end to update the values and restart a new PSC

cycle.

18.6.1 Value Update Synchronization

New timing values or PSC output configuration can be written during the PSC cycle. Thanks to

LOCK configuration bit, the new whole set of values can be taken into account after the end of

the PSC cycle.

When LOCK configuration bit is set, there is no update. The update of the PSC internal registers

will be done at the end of the PSC cycle if the LOCK bit is released to zero.

The registers which update is synchronized thanks to LOCK are POC, POM2, POCRnSAH/L,

POCRnRAH/L, POCRnSBH/L and POCRnRBH/L.

See these register’s description starting on page 149.

PSCOUTnA

PSCOUTnB

PSC Counter

POCRnRB

POCRnSA

POCRnSB

Run

Software

PSC

Regulation Loop

Calculation

Writting in

PSC Registers

Cycle

With Set i

Cycle

With Set i

Cycle

With Set i

Cycle

With Set i

Cycle

With Set j

End of Cycle

Request for

an Update

1 2 ... 135 136 137 138 139 140 141 142 143 144 145 ... 342 343

Komentarze do niniejszej Instrukcji

Brak uwag

Rainbow-electronics ATmega64M1 Instrukcja Użytkownika Strona 140

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Czujniki Rainbow-electronics ATmega64M1