Datasheet

SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
1080
40.7.30 PWM Spread Spectrum Register
Name: PWM_SSPR
Address: 0x400000A0
Access: Read/Write
This register can only be written if bits WPSWS3 and WPHWS3 are cleared in the PWM Write Protection Status Register.
Only the first 16 bits (channel counter size) are significant.
 SPRD: Spread Spectrum Limit Value
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.
 SPRDM: Spread Spectrum Counter Mode
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
76543210
SPRD