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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny88 датащи(PDF) 196 Page - ATMEL Corporation |
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ATtiny88 датащи(HTML) 196 Page - ATMEL Corporation |
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196 / 266 page  196 8008C–AVR–03/09 ATtiny48/88 Figure 20-6. Mapping Between BS1, BS2 and the Fuse and Lock Bits During Read 20.7.13 Reading the Signature Bytes The algorithm for reading the Signature bytes is as follows (refer to “Programming the Flash” on page 190 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”. 20.7.14 Reading the Calibration Byte The algorithm for reading the Calibration byte is as follows (refer to “Programming the Flash” on page 190 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”. 20.8 Serial Downloading Both the Flash and EEPROM memory arrays can be programmed using the serial SPI bus while RESET is pulled to GND. The serial interface consists of pins SCK, MOSI (input) and MISO (out- put). After RESET is set low, the Programming Enable instruction needs to be executed first before program/erase operations can be executed. NOTE, in Table 20-13 on page 197, the pin mapping for SPI programming is listed. Not all parts use the SPI pins dedicated for the internal SPI interface. Lock Bits 0 1 BS2 Fuse High Byte 0 1 BS1 DATA Fuse Low Byte 0 1 BS2 Extended Fuse Byte |
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