AT32UC3C2512C Automotive Atmel Corporation, AT32UC3C2512C Automotive Datasheet - Page 99

• Manufacturer Part Number: AT32UC3C2512C Automotive
• Manufacturer: Atmel Corporation

8.6.8
Name:
Access Type:
Offset:
Reset Value:
•
•
•
•
9166C–AVR-08/11
PLLCOUNT: PLL Count
PLLMUL: PLL Multiply Factor
PLLDIV: PLL Division Factor
PLLOPT: PLL Option
31
23
15
7
-
-
-
-
Specifies the number of slow clock cycles before ISR.LOCKn is set after PLLn has been written, or after PLLn has been
automatically re-enabled after exiting a sleep mode.
These fields determine the ratio of the output frequency of the internal VCO of the PLL (f
According to PLLOPT[1] bit, it gives the following PLL frequency value f
PLLDIV gives also the input frequency of the PLL (f
Select the operating range for the PLL.
PLLOPT[0]: Select the VCO frequency range.
PLLOPT[1]: Enable the extra output divider.
PLLOPT[2]: Disable the Wide-Bandwidth mode (Wide-Bandwidth mode allows a faster startup time and out-of-lock time).
PLL Control Register
if the PLLDIV field is set to 0: f
if the PLLDIV field is greater than 0: f
f
f
if the PLLOPT[1] bit is set to 0: f
if the PLLOPT[1] bit is set to 1: f
Note that the PLLMUL field cannot be equal to 0 or 1, or the behavior of the PLL will be undefined.
vco
vco
= (PLLMUL+1) / (PLLDIV) * f
= 2 * (PLLMUL+1) * f
30
22
14
PLL0,1
Read/Write
0x001C,0x0020
0x00000000
6
-
-
-
-
osc
if PLLDIV = 0
29
21
13
5
-
-
IN
= f
PLL
PLL
osc
OSC
= f
= f
if PLLDIV > 0
IN
VCO
VCO
= f
OSC
PLLOPT
/ 2
28
20
12
/ (2 * PLLDIV)
4
-
-
IN
):
27
19
11
3
PLLCOUNT
PLL
:
26
18
10
2
vco
PLLMUL
PLLOSC
PLLDIV
) to the source oscillator frequency:
25
17
9
1
AT32UC3C
PLLEN
24
16
8
0
99