Datasheet

512
32133D–11/2011
UC3D
25.7.1 Control Register
Name:
CR
Access Type: Read/Write
Offset:0x00
Reset Value: 0x00000000
•
SPREAD: Spread Spectrum Limit Value
The spread spectrum limit value, together with the TOP field, defines the range for the spread spectrum counter. It is introduced
in order to achieve constant varying duty cycles on the output PWM waveforms. Refer to Section25.6.3 for more information.
• TOP: Timebase Counter Top Value
The top value for the timebase counter. The value written to this field will update the least significant 8 bits of the TVR.TOP field
in case only 8-bits resolution is required. The 4 most significant bits of TVR.TOP will be written to 0. When the TVR.TOP field is
written, this CR.TOP field will also be updated with only the least significant 8 bits of TVR.TOP field.
• TCLR: Timebase Clear
Writing a zero to this bit has no effect.
Writing a one to this bit will clear the timebase counter.
This bit is always read as zero.
• EN: Module Enable
0: The PWMA is disabled
1: The PWMA is enabled
31 30 29 28 27 26 25 24
-------SPREAD[8]
23 22 21 20 19 18 17 16
SPREAD[7:0]
15 14 13 12 11 10 9 8
TOP
76543210
------TCLREN