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ATmega644PA Datasheet(PDF) 299 Page - ATMEL Corporation |
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ATmega644PA Datasheet(HTML) 299 Page - ATMEL Corporation |
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299 / 468 page  299 8152G–AVR–11/09 ATmega164PA/324PA/644PA/1284P 26.2.1 Latching of Fuses The fuse values are latched when the device enters programming mode and changes of the fuse values will have no effect until the part leaves Programming mode. This does not apply to the EESAVE Fuse which will take effect once it is programmed. The fuses are also latched on Power-up in Normal mode. 26.3 Signature Bytes All Atmel microcontrollers have a three-byte signature code which identifies the device. This code can be read in both serial and parallel mode, also when the device is locked. The three bytes reside in a separate address space. For the ATmega164PA/324PA/644PA/1284P the sig- nature bytes are given in Table 26-6. 26.4 Calibration Byte The ATmega164PA/324PA/644PA/1284P has a byte calibration value for the internal RC Oscil- lator. This byte resides in the high byte of address 0x000 in the signature address space. During reset, this byte is automatically written into the OSCCAL Register to ensure correct frequency of the calibrated RC Oscillator. 26.5 Page Size Table 26-6. Device and JTAG ID Part Signature Bytes Address JTAG 0x000 0x001 0x002 Part Number Manufacture ID ATmega164PA 0x1E 0x94 0x0A 940A 0x1F ATmega324PA 0x1E 0x95 0x11 9511 0x1F ATmega644PA 0x1E 0x96 0x0A 960A 0x1F ATmega1284P 0x1E 0x97 0x05 9705 0x1F Table 26-7. No. of Words in a Page and No. of Pages in the Flash Device Flash Size Page Size PCWORD No. of Pages PCPAGE PCMSB ATmega164PA 8K words (16 Kbytes) 64 words PC[5:0] 128 PC[12:6] 12 ATmega324PA 16K words (32 Kbytes) 64 words PC[5:0] 256 PC[13:6] 13 ATmega644PA 32K words (64 Kbytes) 128 words PC[6:0] 256 PC[14:6] 14 ATmega1284P 64K words (128 Kbytes) 128 words PC[6:0] 512 PC[15:7] 15 Table 26-8. No. of Words in a Page and No. of Pages in the EEPROM Device EEPROM Size Page Size PCWORD No. of Pages PCPAGE EEAMSB ATmega164PA 512 bytes 4 bytes EEA[1:0] 128 EEA[8:2] 8 ATmega324PA 1 Kbytes 4 bytes EEA[1:0] 256 EEA[9:2] 9 ATmega644PA 2 Kbytes 8 bytes EEA[2:0] 256 EEA[10:2] 10 ATmega1284P 4 Kbytes 8 bytes EEA[2:0] 512 EEA[11:3] 11 |
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