RM0082
Miscellaneous registers (Misc)
Doc ID 018672 Rev 1
221/844
12.4.7 PLL1/2_MOD
registers
The PLL1/2_MOD is R/W registers which configure the dithering modulation parameters.
The register bit assignments is given in the next table.
[10:08]
pll_postdiv_P 3’h1
Post divider (P) table
P(2:0): PLL post-divisor values in 1:32 in 2’powers (ref. Post
Divider table)
Pdiv2
Pdiv1
Pdiv0
Division factor
0
0
0
1
0
0
1
2
0
1
0
4
0
1
1
8
1
0
0
16
1
0
1
32
1
1
0
32
1
1
1
32
[07:00]
pll_prediv_N
8’h0C
N(7:0): PLL pre-divisor programmable value from 1 to 255
(ref. Pre-divisor table)
The reference clock fref should be within the range below:
The reference clock value is given from the following
formula:
Pre-divider (N) table
div
7
div
6
div
5
div
4
div
3
div 2
div 1
div 0
Div fact.
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
1
0
2
~
~
~
~
~
~
~
~
~
1
1
1
1
1
1
1
0
254
1
1
1
1
1
1
1
1
255
Table 161.
PLL1/2_FRQ register bit assignments (continued)
PLL1_FRQ Register
PLL2_FRQ
0x00C
0x018
Bit
Name
Reset
Value
Description
1MHz
f
re f
40Mhz
=
<
(
)
=
<
f
ref
f
osci
N
-----------
=