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ATtiny44 Datasheet(PDF) 171 Page - ATMEL Corporation |
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ATtiny44 Datasheet(HTML) 171 Page - ATMEL Corporation |
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171 / 236 page  171 8006H–AVR–10/09 ATtiny24/44/84 19.7.6 Reading the Flash The algorithm for reading the Flash memory is as follows (refer to Table 19-16 on page 171): 1. Load Command "Read Flash". 2. Read Flash Low and High Bytes. The contents at the selected address are available at serial output SDO. 19.7.7 Reading the EEPROM The algorithm for reading the EEPROM memory is as follows (refer to Table 19-16 on page 171): 1. Load Command “Read EEPROM”. 2. Read EEPROM Byte. The contents at the selected address are available at serial out- put SDO. 19.7.8 Programming and Reading the Fuse and Lock Bits The algorithms for programming and reading the Fuse Low/High bits and Lock bits are shown in Table 19-16 on page 171. 19.7.9 Reading the Signature Bytes and Calibration Byte The algorithms for reading the Signature bytes and Calibration byte are shown in Table 19-16 on page 171. 19.7.10 Power-off sequence Set SCI to “0”. Set RESET to “1”. Turn V CC power off. Table 19-16. High-voltage Serial Programming Instruction Set for ATtiny24/44/84 Instruction Instruction Format Operation Remarks Instr.1/5 Instr.2/6 Instr.3/7 Instr.4 Chip Erase SDI SII SDO 0_1000_0000_00 0_0100_1100_00 x_xxxx_xxxx_xx 0_0000_0000_00 0_0110_0100_00 x_xxxx_xxxx_xx 0_0000_0000_00 0_0110_1100_00 x_xxxx_xxxx_xx Wait after Instr.3 until SDO goes high for the Chip Erase cycle to finish. Load “Write Flash” Command SDI SII SDO 0_0001_0000_00 0_0100_1100_00 x_xxxx_xxxx_xx Enter Flash Programming code. Load Flash Page Buffer SDI SII SDO 0_ bbbb_bbbb _00 0_0000_1100_00 x_xxxx_xxxx_xx 0_eeee_eeee_00 0_0010_1100_00 x_xxxx_xxxx_xx 0_0000_0000_00 0_0110_1101_00 x_xxxx_xxxx_xx 0_0000_0000_00 0_0110_1100_00 x_xxxx_xxxx_xx Repeat after Instr. 1 - 7until the entire page buffer is filled or until all data within the page is filled. See Note 1. SDI SII SDO 0_dddd_dddd_00 0_0011_1100_00 x_xxxx_xxxx_xx 0_0000_0000_00 0_0111_1101_00 x_xxxx_xxxx_xx 0_0000_0000_00 0_0111_1100_00 x_xxxx_xxxx_xx Instr 5-7. Load Flash High Address and Program Page SDI SII SDO 0_0000_000a_00 0_0001_1100_00 x_xxxx_xxxx_xx 0_0000_0000_00 0_0110_0100_00 x_xxxx_xxxx_xx 0_0000_0000_00 0_0110_1100_00 x_xxxx_xxxx_xx Wait after Instr 3 until SDO goes high. Repeat Instr. 2 - 3 for each loaded Flash Page until the entire Flash or all data is programmed. Repeat Instr. 1 for a new 256 byte page. See Note 1. |
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