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ATTINY2313-20PU Scheda tecnica(PDF) 18 Page - ATMEL Corporation

Il numero della parte ATTINY2313-20PU
Spiegazioni elettronici  8-bit Microcontroller with 2K Bytes In-System Programmable Flash
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Produttore elettronici  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATTINY2313-20PU Scheda tecnica(HTML) 18 Page - ATMEL Corporation

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18
ATtiny2313/V
2543I–AVR–04/06
Figure 10. On-chip Data SRAM Access Cycles
EEPROM Data Memory
The ATtiny2313 contains 128 bytes of data EEPROM memory. It is organized as a sep-
arate 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 Registers,
the EEPROM Data Register, and the EEPROM Control Register. For a detailed descrip-
tion of Serial data downloading to the EEPROM, see page 176.
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 1. A self-timing function, how-
ever, lets the user software detect when the next byte can be written. If the user code
contains instructions 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
22. for details on how to avoid problems in these situations.
In order to prevent unintentional EEPROM writes, a specific write procedure must be fol-
lowed. 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.
The EEPROM Address
Register
• Bit 7 – Res: Reserved Bit
This bit is reserved in the ATtiny2313 and will always read as zero.
clk
WR
RD
Data
Data
Address
Address valid
T1
T2
T3
Compute Address
CPU
Memory Access Instruction
Next Instruction
Bit
7654
321
0
EEAR6
EEAR5
EEAR4
EEAR3
EEAR2
EEAR1
EEAR0
EEAR
Read/Write
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
X
X
X
X
X
X
X


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