TM4C1233D5PM Datasheet, PDF (263/1214 Pages) Texas Instruments – Tiva Microcontroller

Tiva^™ TM4C1233D5PM Microcontroller
Register 16: PLL Frequency 0 (PLLFREQ0), offset 0x160
This register always contains the current M value presented to the system PLL.
The PLL frequency can be calculated using the following equation:
PLL frequency = (XTAL frequency * MDIV) / ((Q + 1) * (N + 1))
where
MDIV = MINT + (MFRAC / 1024)
The Q and N values are shown in the PLLFREQ1 register. Table 22-14 on page 1179 shows the M,
Q, and N values as well as the resulting PLL frequency for the various XTAL configurations.
PLL Frequency 0 (PLLFREQ0)
Base 0x400F.E000
Offset 0x160
Type RO, reset 0x0000.0032
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
MFRAC
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
MFRAC
MINT
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
1
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:20
19:10
9:0
Name
reserved
MFRAC
MINT
Type
RO
RO
RO
Reset
0x000
0x32
0x00
Description
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
PLL M Fractional Value
This field contains the integer value of the PLL M value.
PLL M Integer Value
This field contains the integer value of the PLL M value.
June 12, 2014
263
Texas Instruments-Production Data