2-5
Clock Configuration
2.6.2.1 System Clock Control Register
The SCCR is memory-mapped into the SIU register map of the MSC8101.
2.6.2.2 System Clock Mode Register
SCMR is a read-only register that is updated during power-on reset (PORESET) and provides the mode
control signals to the PLLs, DLL, and clock logic. This register reflects the currently defined
configuration settings. For details of the available setting options, see AN2288.
Bit 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
—
TYPE
R/W
RESET
—
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
—
DFBRG
TYPE
R/W
RESET
—
Figure 2-1. System Clock Control Register (SCCR)—0x10C80
Table 2-7. SCCR Bit Descriptions
Name
Bit No.
Defaults
Description
Settings
PORESET
Hard
Reset
—
0–29
—
—
Reserved
DFBRG
30–31
01
Unaffected Division Factor for the BRG Clock
Defines the BRGCLK frequency. Changing
this value does not result in a loss of lock
condition.
00
Divide by 4
01
Divide by 16 (default value)
10
Divide by 64
11
Divide by 256
Bit 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
—
COREPDF
COREMF
BUSDF
CPMDF
TYPE
R
RESET
—
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
SPLLPDF
SPLLMF
—
DLLDIS
—
TYPE
R
RESET
—
Figure 2-2. System Clock Mode Register (SCMR)—0x10C88