Table 29-1, Table 29-2, Give – Rainbow Electronics AT91CAP9S250A User Manual
Page 361
361
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
When the prescaler is activated, an additional time of 64 clock cycles of the new selected clock
has to be added.
Notes:
1. PLL designates either the PLL A or the PLL B Clock.
2. PLLCOUNT designates either PLLACOUNT or PLLBCOUNT.
Table 29-1.
Clock Switching Timings (Worst Case)
From
Main Clock
SLCK
PLL Clock
To
Main Clock
–
4 x SLCK +
2.5 x Main Clock
3 x PLL Clock +
4 x SLCK +
1 x Main Clock
SLCK
0.5 x Main Clock +
4.5 x SLCK
–
3 x PLL Clock +
5 x SLCK
PLL Clock
0.5 x Main Clock +
4 x SLCK +
PLLCOUNT x SLCK +
2.5 x PLLx Clock
2.5 x PLL Clock +
5 x SLCK +
PLLCOUNT x SLCK
2.5 x PLL Clock +
4 x SLCK +
PLLCOUNT x SLCK
Table 29-2.
Clock Switching Timings Between Two PLLs (Worst Case)
From
PLLA Clock
PLLB Clock
To
PLLA Clock
2.5 x PLLA Clock +
4 x SLCK +
PLLACOUNT x SLCK
3 x PLLA Clock +
4 x SLCK +
1.5 x PLLA Clock
PLLB Clock
3 x PLLB Clock +
4 x SLCK +
1.5 x PLLB Clock
2.5 x PLLB Clock +
4 x SLCK +
PLLBCOUNT x SLCK