Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO データシート

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

1080

PWM_SSPR

0x400000A0

Read/Write

This register can only be written if bits WPSWS3 and WPHWS3 are cleared in the 

.

Only the first 16 bits (channel counter size) are significant.



The spread spectrum limit value defines the range for the spread spectrum counter. It is introduced in order to achieve con-
stant varying PWM period for the output waveform.



0: Triangular mode. The spread spectrum counter starts to count from -SPRD when the channel 0 is enabled and counts 
upwards at each PWM period. When it reaches +SPRD, it restarts to count from -SPRD again.

1: Random mode. The spread spectrum counter is loaded with a new random value at each PWM period. This random 
value is uniformly distributed and is between -SPRD and +SPRD.

31

30

29

28

27

26

25

24

–

–

–

–

–

–

–

SPRDM

23

22

21

20

19

18

17

16

SPRD

15

14

13

12

11

10

9

8

SPRD

7

6

5

4

3

2

1

0

SPRD