ATmega1284PR231 Atmel Corporation, ATmega1284PR231 Datasheet - Page 119

• Manufacturer Part Number: ATmega1284PR231
• Manufacturer: Atmel Corporation

Specifications of ATmega1284PR231

• Flash (kbytes): 128 Kbytes
• Max. Operating Frequency: 20 MHz
• Max I/o Pins: 32
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Crypto Engine: AES
• Sram (kbytes): 16
• Eeprom (bytes): 4096
• Operating Voltage (vcc): 1.8 to 3.6
• Timers: 3
• Frequency Band: 2.4 GHz
• Max Data Rate (mb/s): 2
• Antenna Diversity: Yes
• External Pa Control: Yes
• Power Output (dbm): 3
• Receiver Sensitivity (dbm): -101
• Receive Current Consumption (ma): 13.2
• Transmit Current Consumption (ma): 14.4
• Link Budget (dbm): 104

8111C–MCU Wireless–09/09
Bit
+0x12
Read/Write
Initial Value
R/W
7
1
R/W
• Bit [2:0] - CLKM_CTRL
These register bits set clock rate of pin 17 (CLKM).
Table 9-14.
Register 0x12 (XOSC_CTRL):
The register XOSC_CTRL controls the operation of the crystal oscillator.
• Bit [7:4] - XTAL_MODE
These register bits set the operating mode of the crystal oscillator. For normal operation the
default value is set to XTAL_MODE = 0xF after reset. Using an external clock source it is recom-
mended to set XTAL_MODE = 0x4.
Table 9-15.
6
1
Register Bit
CLKM_CTRL
Register Bit
XTAL_MODE
XTAL_MODE
R/W
5
1
Clock Rate Setting at pin CLKM
Crystal Oscillator Operating Mode
Value
0x4
0xF
R/W
4
1
Value
Description
Internal crystal oscillator disabled, use external reference frequency
Internal crystal oscillator enabled
XOSC voltage regulator enabled
0
1
2
3
4
5
6
7
Description
No clock at pin 17 (CLKM), pin set to logic low
1 MHz
2 MHz
4 MHz
8 MHz
16 MHz
250 kHz
62.5 kHz (IEEE 802.15.4 symbol rate)
R/W
3
0
R/W
2
0
XTAL_TRIM
R/W
1
0
AT86RF231
R/W
0
0
XOSC_CTRL
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