Atmel /AT91SAM9CN12 /PMC /PMC_MCKR

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Interpret as PMC_MCKR

31 2827 2423 2019 1615 1211 87 43 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (SLOW_CLK)CSS0 (CLOCK_DIV1)PRES0 (EQ_PCK)MDIV 0 (NOT_DIV2)PLLADIV2

PLLADIV2=NOT_DIV2, MDIV=EQ_PCK, PRES=CLOCK_DIV1, CSS=SLOW_CLK

Description

Master Clock Register

Fields

CSS

Master/Processor Clock Source Selection

0 (SLOW_CLK): Slow Clock is selected

1 (MAIN_CLK): Main Clock is selected

2 (PLLA_CLK): PLLACK/PLLADIV2 is selected

3 (PLLB_CLK): PLLBCK is selected

PRES

Master/Processor Clock Prescaler

0 (CLOCK_DIV1): Selected clock

1 (CLOCK_DIV2): Selected clock divided by 2

2 (CLOCK_DIV4): Selected clock divided by 4

3 (CLOCK_DIV8): Selected clock divided by 8

4 (CLOCK_DIV16): Selected clock divided by 16

5 (CLOCK_DIV32): Selected clock divided by 32

6 (CLOCK_DIV64): Selected clock divided by 64

MDIV

Master Clock Division

0 (EQ_PCK): Master Clock is Prescaler Output Clock divided by 1.Warning: SysClk DDR and DDRCK are not available.

1 (PCK_DIV2): Master Clock is Prescaler Output Clock divided by 2.SysClk DDR is equal to 2 x MCK. DDRCK is equal to MCK.

2 (PCK_DIV4): Master Clock is Prescaler Output Clock divided by 4.SysClk DDR is equal to 2 x MCK. DDRCK is equal to MCK.

3 (PCK_DIV3): Master Clock is Prescaler Output Clock divided by 3.SysClk DDR is equal to 2 x MCK. DDRCK is equal to MCK.

PLLADIV2

PLLA divisor by 2

0 (NOT_DIV2): PLLA clock frequency is divided by 1.

1 (DIV2): PLLA clock frequency is divided by 2.

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