ATmega256RZAV Atmel Corporation, ATmega256RZAV Datasheet - Page 35
ATmega256RZAV
Manufacturer Part Number
ATmega256RZAV
Description
Manufacturer
Atmel Corporation
Specifications of ATmega256RZAV
Flash (kbytes)
256 Kbytes
Max. Operating Frequency
16 MHz
Max I/o Pins
54
Spi
3
Twi (i2c)
1
Uart
2
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Crypto Engine
No
Sram (kbytes)
8
Eeprom (bytes)
4096
Operating Voltage (vcc)
1.8 to 3.6
Timers
6
Frequency Band
2.4 GHz
Max Data Rate (mb/s)
0.25
Antenna Diversity
No
External Pa Control
No
Power Output (dbm)
3
Receiver Sensitivity (dbm)
-101
Receive Current Consumption (ma)
16.0
Transmit Current Consumption (ma)
17.0
Link Budget (dbm)
104
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATmega256RZAV-8MU
Manufacturer:
Atmel
Quantity:
135
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9.2
9.2.1
9.2.1.1
9.2.1.2
9.2.1.3
2549N–AVR–05/11
Register Description
EEPROM registers
EEARH and EEARL – The EEPROM Address Register
EEDR – The EEPROM Data Register
EECR – The EEPROM Control Register
• Bits 15:12 – Res: Reserved Bits
These bits are reserved bits and will always read as zero.
• Bits 11:0 – EEAR8:0: EEPROM Address
The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address in the
4Kbytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and
4096. The initial value of EEAR is undefined. A proper value must be written before the
EEPROM may be accessed.
• Bits 7:0 – EEDR7:0: EEPROM Data
For the EEPROM write operation, the EEDR Register contains the data to be written to the
EEPROM in the address given by the EEAR Register. For the EEPROM read operation, the
EEDR contains the data read out from the EEPROM at the address given by EEAR.
• Bits 7:6 – Res: Reserved Bits
These bits are reserved bits and will always read as zero.
• Bits 5, 4 – EEPM1 and EEPM0: EEPROM Programming Mode Bits
The EEPROM Programming mode bit setting defines which programming action that will be trig-
gered when writing EEPE. It is possible to program data in one atomic operation (erase the old
value and program the new value) or to split the Erase and Write operations in two different
operations. The Programming times for the different modes are shown in
While EEPE is set, any write to EEPMn will be ignored. During reset, the EEPMn bits will be
reset to 0b00 unless the EEPROM is busy programming.
Bit
0x22 (0x42)
0x21 (0x41)
Read/Write
Initial Value
Bit
0x20 (0x40)
Read/Write
Initial Value
Bit
0x1F (0x3F)
Read/Write
Initial Value
EEAR7
R/W
MSB
R/W
15
R
–
7
0
X
R
7
–
0
7
0
EEAR6
R/W
R/W
14
R
X
–
6
0
R
6
–
0
6
0
ATmega640/1280/1281/2560/2561
EEAR5
EEPM1
R/W
R/W
R/W
13
R
X
–
5
0
X
5
5
0
EEAR4
EEPM0
R/W
R/W
R/W
12
R
–
4
0
X
X
4
4
0
EEAR11
EEAR3
EERIE
R/W
R/W
R/W
R/W
11
X
X
3
3
0
3
0
EEAR10
EEMPE
EEAR2
R/W
R/W
R/W
R/W
10
2
0
X
X
2
0
2
EEAR9
EEAR1
EEPE
R/W
R/W
R/W
R/W
1
0
1
X
X
X
9
1
Table 9-1 on page
EEAR8
EEAR0
EERE
LSB
R/W
R/W
R/W
R/W
X
X
0
0
0
0
8
0
EEARH
EEARL
EEDR
EECR
36.
35
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