ATmega644R212 Atmel Corporation, ATmega644R212 Datasheet - Page 120
ATmega644R212
Manufacturer Part Number
ATmega644R212
Description
Manufacturer
Atmel Corporation
Specifications of ATmega644R212
Flash (kbytes)
64 Kbytes
Max. Operating Frequency
20 MHz
Max I/o Pins
32
Spi
3
Twi (i2c)
1
Uart
1
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Crypto Engine
AES
Sram (kbytes)
4
Eeprom (bytes)
2048
Operating Voltage (vcc)
1.8 to 3.6
Timers
3
Frequency Band
700/800/900MHz
Max Data Rate (mb/s)
1
Antenna Diversity
No
External Pa Control
Yes
Power Output (dbm)
10
Receiver Sensitivity (dbm)
-110
Receive Current Consumption (ma)
9.0
Transmit Current Consumption (ma)
18 at 5dBm
Link Budget (dbm)
120
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• Bit [3:0] - XTAL_TRIM
The register bits XTAL_TRIM control two internal capacitance arrays connected to pins XTAL1
and XTAL2. A capacitance value in the range from 0 pF to 4.5 pF is selectable with a resolution
of 0.3 pF.
Table 9-16.
Register Bit
XTAL_TRIM
Crystal Oscillator Trimming Capacitors
Value
0x0
0x1
0xF
...
Description
0.0 pF, trimming capacitors disconnected
0.3 pF trimming capacitor switched on
4.5 pF trimming capacitor switched on
AT86RF231
120
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