ATmega328P datasheet(19/448 Pages) ATMEL

19 / 448 page

8161D–AVR–10/09

ATmega48PA/88PA/168PA/328P

7.3.1

Data Memory Access Times

This section describes the general access timing concepts for internal memory access. The

internal data SRAM access is performed in two clk

CPU cycles as described in Figure 7-4.

Figure 7-4.

On-chip Data SRAM Access Cycles

7.4

EEPROM Data Memory

The ATmega48PA/88PA/168PA/328P contains 256/512/512/1K bytes of data EEPROM mem-

ory. It is organized as a separate data space, in which single bytes can be read and written. The

EEPROM has an endurance of at least 100,000 write/erase cycles. The access between the

EEPROM and the CPU is described in the following, specifying the EEPROM Address Regis-

ters, the EEPROM Data Register, and the EEPROM Control Register.

”Memory Programming” on page 294 contains a detailed description on EEPROM Programming

in SPI or Parallel Programming mode.

7.4.1

EEPROM Read/Write Access

The EEPROM Access Registers are accessible in the I/O space.

The write access time for the EEPROM is given in Table 7-2. A self-timing function, however,

lets the user software detect when the next byte can be written. If the user code contains instruc-

tions that write the EEPROM, some precautions must be taken. In heavily filtered power

supplies, V

CC is likely to rise or fall slowly on power-up/down. This causes the device for some

period of time to run at a voltage lower than specified as minimum for the clock frequency used.

See ”Preventing EEPROM Corruption” on page 20 for details on how to avoid problems in these

situations.

In order to prevent unintentional EEPROM writes, a specific write procedure must be followed.

Refer to the description of the EEPROM Control Register for details on this.

When the EEPROM is read, the CPU is halted for four clock cycles before the next instruction is

executed. When the EEPROM is written, the CPU is halted for two clock cycles before the next

instruction is executed.

clk

Data

Address

Address valid

Compute Address

CPU

Memory Access Instruction

Next Instruction

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