TM4C1237H6PM Datasheet, PDF (250/1278 Pages) Texas Instruments – Tiva Microcontroller

System Control
Bit/Field
10:6
Name
XTAL
Type
RW
Reset
0x0B
Description
Crystal Value
This field specifies the crystal value attached to the main oscillator. The
encoding for this field is provided below.
Frequencies that may be used with the USB interface are indicated in
the table. To function within the clocking requirements of the USB
specification, a crystal of 5, 6, 8, 10, 12, or 16 MHz must be used.
Value Crystal Frequency (MHz) Not Crystal Frequency (MHz)
Using the PLL
Using the PLL
0x00-0x5
reserved
0x06
4 MHz
reserved
0x07
4.096 MHz
reserved
0x08
4.9152 MHz
reserved
0x09
5 MHz (USB)
0x0A
5.12 MHz
0x0B
6 MHz (USB)
0x0C
6.144 MHz
0x0D
7.3728 MHz
0x0E
8 MHz (USB)
0x0F
8.192 MHz
0x10
10.0 MHz (USB)
0x11
12.0 MHz (USB)
0x12
12.288 MHz
0x13
13.56 MHz
0x14
14.31818 MHz
0x15
16.0 MHz (USB)
0x16
16.384 MHz
0x17
18.0 MHz (USB)
0x18
20.0 MHz (USB)
0x19
24.0 MHz (USB)
0x1A
25.0 MHz (USB)
250
June 12, 2014
Texas Instruments-Production Data