AT83C5134 Atmel Corporation, AT83C5134 Datasheet - Page 15

• Manufacturer Part Number: AT83C5134
• Manufacturer: Atmel Corporation

Specifications of AT83C5134

• Max. Operating Frequency: 32 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 1.25
• Eeprom (bytes): 512
• Operating Voltage (vcc): 2.7 to 3.6
• Timers: 4
• Mask Rom (kbytes): 8
• Watchdog: Yes

6.3.2
6.3.3
7683C–USB–11/07
PLL Programming
Divider Values
Figure 6-4.
The typical values are: R = 560 Ω, C1 = 820 pf, C2 = 150 pF.
The PLL is programmed using the flow shown in Figure 6-5. As soon as clock generation is
enabled user must wait until the lock indicator is set to ensure the clock output is stable.
Figure 6-5.
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 6-1.
Oscillator Frequency
12 MHz
16 MHz
18 MHz
20 MHz
24 MHz
3 MHz
6 MHz
8 MHz
PLL Filter Connection
PLL Programming Flow
Typical Divider Values
PLLF
R+1
16
12
Configure Dividers
8
6
4
3
8
2
Programming
PLL Locked?
N3:0 = xxxxb
R3:0 = xxxxb
LOCK = 1?
Enable PLL
PLLEN = 1
PLL
VSS
R
C1
VSS
N+1
1
1
1
1
1
3
5
1
C2
AT83C5134/35/36
Table
6-1.
PLLDIV
B4h
F0h
70h
50h
30h
20h
72h
10h
15