35.7.21 Period Buffer Value

Note: This register is write-synchronized: SYNCBUSY.PER must be checked to ensure the PER register synchronization is complete. This register must be written with 32 bits accesses only (no 8 or 16 bits writes).

Name:	PERBUF
Offset:	0x6C
Reset:	0xFFFFFFFF
Property:	Write-Synchronized


Bit	31	30	29	28	27	26	25	24

Access
Reset


Bit	23	22	21	20	19	18	17	16
	PERBUF[17:10]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	1	1	1	1	1	1	1	1


Bit	15	14	13	12	11	10	9	8
	PERBUF[9:2]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	1	1	1	1	1	1	1	1


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

Bits 23:6 – PERBUF[17:0] Period Buffer Value

These bits hold the value of the Period Buffer register. The value is copied to the PER register on UPDATE condition or CTRLBSET.CMD = UPDATE command when CTRLBSET.LUPD is 1.

Note: When the TCC is configured as 16-bit timer/counter, the excess bits are read zero.

Note: This bit field occupies the MSB of the register, [23:m]. m is dependent on the Resolution bit in the Control A register (CTRLA.RESOLUTION):


CTRLA.RESOLUTION	Bits [23:m]
0x0 - NONE	23:0
0x1 - DITH4	23:4
0x2 - DITH5	23:5
0x3 - DITH6	23:6 (depicted)

Bits 5:0 – DITHERBUF[5:0] Dithering Buffer Cycle Number

These bits represent the PER.DITHER bits buffer. When the double buffering is enabled, the value of this bit field is copied to the PER.DITHER bits on an UPDATE condition or CTRLBSET.CMD = UPDATE command when CTRLBSET.LUPD is 1.

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