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ATMEGA169V Folha de dados(PDF) 28 Page - ATMEL Corporation

Nome de Peças ATMEGA169V
Descrição Electrónicos  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
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Fabricante Electrônico  ATMEL [ATMEL Corporation]
Página de início  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA169V Folha de dados(HTML) 28 Page - ATMEL Corporation

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ATmega169/V
2514P–AVR–07/06
Oscillator Calibration Register
– OSCCAL
• Bits 6..0 – CAL6..0: Oscillator Calibration Value
Writing the calibration byte to this address will trim the internal Oscillator to remove pro-
cess variations from the Oscillator frequency. This is done automatically during Chip
Reset. When OSCCAL is zero, the lowest available frequency is chosen. Writing non-
zero values to this register will increase the frequency of the internal Oscillator. Writing
0x7F to the register gives the highest available frequency. The calibrated Oscillator is
used to time EEPROM and Flash access. If EEPROM or Flash is written, do not cali-
brate to more than 10% above the nominal frequency. Otherwise, the EEPROM or Flash
write may fail. Note that the Oscillator is intended for calibration to 8.0 MHz. Tuning to
other values is not guaranteed, as indicated in Table 10.
External Clock
To drive the device from an external clock source, XTAL1 should be driven as shown in
Figure 13. To run the device on an external clock, the CKSEL Fuses must be pro-
grammed to “0000”.
Figure 13. External Clock Drive Configuration
When this clock source is selected, start-up times are determined by the SUT Fuses as
shown in Table 12.
Bit
7654
321
0
CAL6
CAL5
CAL4
CAL3
CAL2
CAL1
CAL0
OSCCAL
Read/Write
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
Device Specific Calibration Value
Table 10. Internal RC Oscillator Frequency Range.
OSCCAL Value
Min Frequency in Percentage of
Nominal Frequency
Max Frequency in Percentage of
Nominal Frequency
0x00
50%
100%
0x3F
75%
150%
0x7F
100%
200%
Table 11. Crystal Oscillator Clock Frequency
CKSEL3..0
Frequency Range
0000
0 - 16 MHz
NC
EXTERNAL
CLOCK
SIGNAL
XTAL2
XTAL1
GND


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