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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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ATmega64A bảng dữ liệu(PDF) 300 Page - ATMEL Corporation |
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ATmega64A bảng dữ liệu(HTML) 300 Page - ATMEL Corporation |
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300 / 392 page  300 8160C–AVR–07/09 ATmega64A 27.6 Parallel Programming 27.6.1 Enter Programming Mode The following algorithm puts the device in Parallel Programming mode: 1. Apply 4.5 - 5.5V between V CC and GND, and wait at least 100 µs. 2. Set RESET to “0” and toggle XTAL1 at least six times. 3. Set the Prog_enable pins listed in Table 27-7 on page 299 to “0000” and wait at least 100 ns. 4. Apply 11.5 - 12.5V to RESET. Any activity on Prog_enable pins within 100 ns after +12V has been applied to RESET, will cause the device to fail entering Programming mode. Note, if External Crystal or External RC configuration is selected, it may not be possible to apply qualified XTAL1 pulses. In such cases, the following algorithm should be followed: Table 27-8. XA1 and XA0 Coding XA1 XA0 Action when XTAL1 is Pulsed 0 0 Load Flash or EEPROM Address (High or low address byte determined by BS1) 0 1 Load Data (High or Low data byte for Flash determined by BS1) 1 0 Load Command 1 1 No Action, Idle Table 27-9. Command Byte Bit Coding Command Byte Command Executed 1000 0000 Chip Erase 0100 0000 Write Fuse Bits 0010 0000 Write Lock Bits 0001 0000 Write Flash 0001 0001 Write EEPROM 0000 1000 Read Signature Bytes and Calibration byte 0000 0100 Read Fuse and Lock Bits 0000 0010 Read Flash 0000 0011 Read EEPROM Table 27-10. No. of Words in a Page and no. of Pages in the Flash Flash Size Page Size PCWORD No. of Pages PCPAGE PCMSB 32K words (64K bytes) 128 words PC[6:0] 256 PC[14:7] 14 Table 27-11. No. of Words in a Page and no. of Pages in the EEPROM EEPROM Size Page Size PCWORD No. of Pages PCPAGE EEAMSB 2K bytes 8 bytes EEA[2:0] 256 EEA[10:3] 10 |
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