Programming Model
MOTOROLA
Phase-Locked Loop and Clock Controller
12-13
12.5.4.2 System PLL Control Register 1
The System PLL control register 1 (SPCTL1) is a 32-bit read/write register in the MCU memory map that
directs the operation of the System PLL. The SPCTL1 control bits are described in this section.
MFI
Bits 13–10
Multiplication Factor (Integer Part)
—Defines the integer part of the BRM
value for the MF. The MFI is decoded so that MFI < 5 results in MFI = 5.
The System PLL oscillates at a frequency determined by Equation 12-1.
Where PD is the division factor of the predivider, MFI is the integer part of the
total MF, MFN is the numerator of the fractional part of the MF, and MFD is the
denominator part of the MF. The MF is chosen to ensure that the resulting VCO
output frequency remains within the specified range. When a new value is
written into the MFI bits, the PLL loses its lock; after a time delay, the PLL
re-locks.
0000–0101 = 5
0110 = 6
...
1111 = 15
MFN
Bits 9–0
Multiplication Factor (Numerator Part)
—Defines the numerator part of the
BRM value for the MF. When a new value is written into the MFN bits, the PLL
loses its lock; after a time delay, the PLL re-locks.
0x000 = 0
0x001 = 1
...
0x3FE = 1022
0x3FF = Reserved
SPCTL1
System PLL Control Register 1
Addr
0x0021B010
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
LF
BRMO
TYPE
rw
r
r
r
r
r
r
r
r
rw
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 12-13. System PLL Control Register 1 Description
Name
Description
Settings
Reserved
Bits 31–16
Reserved—These bits are reserved and should read 0.
LF
Bit 15
Lock Flag
—Indicates whether the System PLL is locked. When
set, the System PLL clock output is valid. When cleared, the
System PLL clock output remains at logic high.
0 = System PLL is not locked
1 = System PLL is locked
Reserved
Bits 14–7
Reserved—These bits are reserved and should read 0.
Table 12-12. System PLL Control Register 0 Description (Continued)
Name
Description
Settings
Содержание DragonBall MC9328MX1
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