47.7.19 Compare/Capture Channel y

The CCy register represents the 32-bit value. The register has two functions, depending of the mode of operation.

For capture operation, this register represents the second buffer level and access point for the CPU and DMA.

For compare operation, this register is continuously compared to the counter value. Normally, the output form the comparator is then used for generating waveforms.

CCy register is updated with the buffer value from their corresponding CCBUFy register when an UPDATE condition occurs.

In addition, in match frequency operation, the CC0 register controls the counter period.

Table 47-28. Register Bit Attribute Legend
Symbol	Description	Symbol	Description	Symbol	Description
R	Readable bit	HC	Cleared by Hardware	(Grey cell)	Unimplemented
W	Writable bit	HS	Set by Hardware	X	Bit is unknown at Reset
K	Write to clear	S	Software settable bit	—	—

Name:	CCy
Offset:	0x44 + y*0x04 [y=0..5]
Reset:	0x00000000
Property:	Write-Synchronized, Read-Synchronized


Bit	31	30	29	28	27	26	25	24
	CC[25:18]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0


Bit	23	22	21	20	19	18	17	16
	CC[17:10]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0


Bit	15	14	13	12	11	10	9	8
	CC[9:2]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0


Bit	7	6	5	4	3	2	1	0
	CC[1:0]		DITHER[5:0]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0

Bits 31:6 – CC[25:0] Channel y Compare/Capture Value

These bits hold the value of the Channel y compare/capture register.

Note:

This bit field occupies the MSB of the register, [31:m]. m is dependent on the Resolution bit in the Control A register (CTRLA.RESOLUTION(CTRLA <6:5>)):


CTRLA.RESOLUTION	Bits [31:m]
0x0 - NONE	31:0
0x1 - DITH4	31:4
0x2 - DITH5	31:5
0x3 - DITH6	31:6 (depicted)

Bits 5:0 – DITHER[5:0] Dithering Cycle Number

These bits hold the number of extra cycles that are added on the PWM pulse width every 64 PWM frames.

Note: This bit field consists of the n LSB of the register. n is dependent on the value of the Resolution bits in the Control A register (CTRLA.RESOLUTION(CTRLA <6:5>)):


CTRLA.RESOLUTION	Bits [n:0]
0x0 - NONE	-
0x1 - DITH4	3:0
0x2 - DITH5	4:0
0x3 - DITH6	5:0 (depicted)