ATMEGA329P_1 datasheet(24/385 Pages) ATMEL

Nome de Peças	ATMEGA329P

Descrição Electrónicos	8-bit Microcontroller with 32K Bytes In-System Programmable Flash

PDF	385 Pages

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Fabricante Electrônico	ATMEL [ATMEL Corporation]

Página de início	http://www.atmel.com

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24 / 385 page

24

8021E–AVR–07/09

ATmega329P/3290P

• Bit 0 – EERE: EEPROM Read Enable

The EEPROM Read Enable Signal EERE is the read strobe to the EEPROM. When the correct

address is set up in the EEAR Register, the EERE bit must be written to a logic one to trigger the

EEPROM read. The EEPROM read access takes one instruction, and the requested data is

available immediately. When the EEPROM is read, the CPU is halted for four cycles before the

next instruction is executed.

The user should poll the EEWE bit before starting the read operation. If a write operation is in

progress, it is neither possible to read the EEPROM, nor to change the EEAR Register.

The calibrated Oscillator is used to time the EEPROM accesses. Table 7-1 lists the typical pro-

gramming time for EEPROM access from the CPU.

The following code examples show one assembly and one C function for writing to the

EEPROM. The examples assume that interrupts are controlled (e.g. by disabling interrupts glob-

ally) so that no interrupts will occur during execution of these functions. The examples also

assume that no Flash Boot Loader is present in the software. If such code is present, the

EEPROM write function must also wait for any ongoing SPM command to finish.

Table 7-1.

EEPROM Programming Time

Symbol

Number of Calibrated

RC Oscillator Cycles

Typical Programming Time

EEPROM write (from CPU)

27,072

3.4 ms

Nº de peça semelhante - ATMEGA329P_1

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
ATMEL Corporation	ATMEGA329P	734Kb / 427P	High Performance, Low Power Atmel

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
ATMEL Corporation	ATMEGA325P	346Kb / 25P	8-bit Microcontroller with 32K Bytes In-System Programmable Flash
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	ATMEGA329P	471Kb / 25P	8-bit Microcontroller with 32K Bytes In-System Programmable Flash
	ATMEGA325P	332Kb / 22P	8-bit Microcontroller with 32K Bytes In-System Programmable Flash
	ATMEGA324PA	546Kb / 24P	8-bit Microcontroller with 32K Bytes In-System Programmable Flash
	ATMEGA32A	427Kb / 18P	8-bit Microcontroller with 32K Bytes In-System Programmable Flash
	ATMEGA32	5Mb / 346P	8-bit Microcontroller with 32K Bytes In-System Programmable Flash
	ATMEGA32A	518Kb / 18P	8-bit Microcontroller with 32K Bytes In-System Programmable Flash
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	ATMEGA32A	6Mb / 352P	8-bit Microcontroller with 32K Bytes In-System Programmable Flash