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AT89C5131A-RDTIL Scheda tecnica(PDF) 15 Page - ATMEL Corporation

Il numero della parte AT89C5131A-RDTIL
Spiegazioni elettronici  8-bit Flash Microcontroller with Full Speed USB Device
PDF  185 Pages
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Produttore elettronici  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5131A-RDTIL Scheda tecnica(HTML) 15 Page - ATMEL Corporation

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15
AT89C5131A-L
4338E–USB–06/06
PLL Programming
The PLL is programmed using the flow shown in Figure 11. As soon as clock generation
is enabled user must wait until the lock indicator is set to ensure the clock output is
stable.
Figure 11. PLL Programming Flow
Divider Values
To generate a 48 MHz clock using the PLL, the divider values have to be configured fol-
lowing the oscillator frequency. The typical divider values are shown in Table 13.
Table 13. Typical Divider Values
PLL
Programming
Configure Dividers
N3:0 = xxxxb
R3:0 = xxxxb
Enable PLL
PLLEN = 1
PLL Locked?
LOCK = 1?
Oscillator Frequency
R+1
N+1
PLLDIV
3 MHz
16
1
F0h
6 MHz
8
1
70h
8 MHz
6
1
50h
12 MHz
4
1
30h
16 MHz
3
1
20h
18 MHz
8
3
72h
20 MHz
12
5
B4h
24 MHz
2
1
10h
32 MHz
3
2
21h
40 MHz
12
10
B9h



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