Atmel Evaluation Kit for AT32uC3A0512, 32-Bit AVR Microcontroller Atmel ATEVK1105 ATEVK1105 Data Sheet
Product codes
ATEVK1105
696
AT32UC3A
32.7.12
PWM Channel Period Register
Register Name:
CPRDx
Access Type:
Read/Write
Only the first 20 bits (internal channel counter size) are significant.
•
•
CPRD: Channel Period
If the waveform is left-aligned, then the output waveform period depends on the counter source clock and can be
calculated:
– By using the Master Clock (MCK) divided by an X given prescaler value (with X being
1, 2, 4, 8, 16, 32, 64, 128, 256, 512, or 1024). The resulting period formula will be:
– By using a Master Clock divided by one of both DIVA or DIVB divider, the formula
becomes, respectively:
or
If the waveform is center-aligned, then the output waveform period depends on the counter source clock and can be
calculated:
– By using the Master Clock (MCK) divided by an X given prescaler value (with X being
1, 2, 4, 8, 16, 32, 64, 128, 256, 512, or 1024). The resulting period formula will be:
– By using a Master Clock divided by one of both DIVA or DIVB divider, the formula
becomes, respectively:
or
31
30
29
28
27
26
25
24
CPRD
23
22
21
20
19
18
17
16
CPRD
15
14
13
12
11
10
9
8
CPRD
7
6
5
4
3
2
1
0
CPRD
X
CPRD
×
(
)
MCK
-------------------------------
CRPD
DIVA
×
(
)
MCK
------------------------------------------
CRPD
DIVAB
×
(
)
MCK
----------------------------------------------
2 X CPRD
×
×
(
)
MCK
------------------------------------------
2 CPRD DIVA
×
×
(
)
MCK
-----------------------------------------------------
2 CPRD
×
DIVB
×
(
)
MCK
-----------------------------------------------------
32058K
AVR32-01/12