LM3S818 Luminary Micro, Inc, LM3S818 Datasheet - Page 79

• Manufacturer Part Number: LM3S818
• Description: Lm3s818 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

February 6, 2007
Bit/Field
26:23
22
21
20
USEPWMDIV
USESYSDIV
reserved
SYSDIV
Name
Type
R/W
R/W
R/W
RO
Reset
0xF
0
0
0
Preliminary
Description
System Clock Divisor
Specifies which divisor is used to generate the system clock
from the PLL output (200 MHz).
When reading the Run-Mode Clock Configuration (RCC)
register (see page 78), the SYSDIV value is MINSYSDIV if
a lower divider was requested and the PLL is being used.
This lower value is allowed to divide a non-PLL source.
clock. The system clock divider is forced to be used when
the PLL is selected as the source.
Reserved bits return an indeterminate value, and should
never be changed.
Use the PWM clock divider as the source for the PWM
clock.
Use the system clock divider as the source for the system
Binary
Value
0000
0001
0010
0100
0101
1000
1001
1010
0011
0110
0111
1011
1100
1101
1110
1111
Divisor
(BYPASS=1)
reserved
/2
/3
/4
/5
/6
/7
/8
/9
/10
/11
/12
/13
/14
/15
/16
Frequency
(BYPASS=0)
reserved
reserved
reserved
50 MHz
40 MHz
33.33 MHz
28.57 MHz
25 MHz
22.22 MHz
20 MHz
18.18 MHz
16.67 MHz
15.38 MHz
14.29 MHz
13.33 MHz
12.5 MHz (default)
LM3S818 Data Sheet
79