AT89C5131A-RDTUM datasheet(16/188 Pages) ATMEL

Part #	AT89C5131A-RDTUM

Description	8-bit Flash Microcontroller with Full Speed USB Device

PDF	188 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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4337K–USB–04/08

AT89C5130A/31A-M

Figure 5-4.

PLL Filter Connection

The typical values are: R = 100 Ω, C1 = 10 nf, C2 = 2.2 nF.

5.3.2

PLL Programming

The PLL is programmed using the flow shown in Figure 5-5. As soon as clock generation is

enabled user must wait until the lock indicator is set to ensure the clock output is stable.

Figure 5-5.

PLL Programming Flow

5.3.3

Divider Values

To generate a 48 MHz clock using the PLL, the divider values have to be configured following

the oscillator frequency. The typical divider values are shown in Table 5-1.

Table 5-1.

Typical Divider Values

VSS

PLLF

VSS

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

F0h

6 MHz

70h

8 MHz

50h

12 MHz

30h

16 MHz

20h

18 MHz

72h

20 MHz

B4h

24 MHz

10h

AT89C5131A-RDTUM Datasheet(PDF) 16 Page - ATMEL Corporation

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