Datasheet

1081
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
40.7.31 PWM Spread Spectrum Update Register
Name: PWM_SSPUP
Address: 0x400000A4
Access: Write-only
This register can only be written if bits WPSWS3 and WPHWS3 are cleared in the PWM Write Protection Status Register.
This register acts as a double buffer for the SPRD value. This prevents an unexpected waveform when modifying the
spread spectrum limit value.
Only the first 16 bits (channel counter size) are significant.
 SPRDUP: Spread Spectrum Limit Value Update
The spread spectrum limit value defines the range for the spread spectrum counter. It is introduced in order to achieve con-
stant varying period for the output waveform.
31 30 29 28 27 26 25 24
––––––––
23 22 21 20 19 18 17 16
SPRDUP
15 14 13 12 11 10 9 8
SPRDUP
76543210
SPRDUP