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ATTINY2313-20MU Arkusz danych(PDF) 18 Page - ATMEL Corporation |
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ATTINY2313-20MU Arkusz danych(HTML) 18 Page - ATMEL Corporation |
18 / 231 page 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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