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ATmega3290P Datasheet(PDF) 305 Page - ATMEL Corporation |
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ATmega3290P Datasheet(HTML) 305 Page - ATMEL Corporation |
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305 / 385 page  305 8021E–AVR–07/09 ATmega329P/3290P Figure 26-6. Mapping Between BS1, BS2 and the Fuse and Lock Bits During Read 26.6.13 Reading the Signature Bytes The algorithm for reading the Signature bytes is as follows (refer to ”Programming the Flash” on page 299 for details on Command and Address loading): 1. A: Load Command “0000 1000”. 2. B: Load Address Low Byte (0x00 - 0x02). 3. Set OE to “0”, and BS1 to “0”. The selected Signature byte can now be read at DATA. 4. Set OE to “1”. 26.6.14 Reading the Calibration Byte The algorithm for reading the Calibration byte is as follows (refer to ”Programming the Flash” on page 299 for details on Command and Address loading): 1. A: Load Command “0000 1000”. 2. B: Load Address Low Byte, 0x00. 3. Set OE to “0”, and BS1 to “1”. The Calibration byte can now be read at DATA. 4. Set OE to “1”. 26.6.15 Parallel Programming Characteristics Lock Bits 0 1 BS2 Fuse High Byte 0 1 BS1 DATA Fuse Low Byte 0 1 BS2 Extended Fuse Byte Table 26-13. Parallel Programming Characteristics, V CC = 5V ± 10% Symbol Parameter Min Typ Max Units VPP Programming Enable Voltage 11.5 12.5 V IPP Programming Enable Current 250 μA tDVXH Data and Control Valid before XTAL1 High 67 ns tXLXH XTAL1 Low to XTAL1 High 200 ns tXHXL XTAL1 Pulse Width High 150 ns tXLDX Data and Control Hold after XTAL1 Low 67 ns tXLWL XTAL1 Low to WR Low 0 ns tXLPH XTAL1 Low to PAGEL high 0 ns tPLXH PAGEL low to XTAL1 high 150 ns |
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