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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny43U датащи(PDF) 22 Page - ATMEL Corporation |
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ATtiny43U датащи(HTML) 22 Page - ATMEL Corporation |
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22 / 182 page  22 8048B–AVR–03/09 ATtiny43U When EEMPE is set, setting EEPE within four clock cycles will program the EEPROM at the selected address. If EEMPE is zero, setting EEPE will have no effect. When EEMPE has been written to one by software, hardware clears the bit to zero after four clock cycles. • Bit 1 – EEPE: EEPROM Program Enable The EEPROM Program Enable Signal EEPE is the programming enable signal to the EEPROM. When EEPE is written, the EEPROM will be programmed according to the EEPMn bits setting. The EEMPE bit must be written to one before a logical one is written to EEPE, otherwise no EEPROM write takes place. When the write access time has elapsed, the EEPE bit is cleared by hardware. When EEPE has been set, the CPU is halted for two cycles before the next instruction is executed. • Bit 0 – EERE: EEPROM Read Enable The EEPROM Read Enable Signal – EERE – is the read strobe to the EEPROM. When the cor- rect address is set up in the EEAR Register, the EERE bit must be written to one to trigger the EEPROM read. The EEPROM read access takes one instruction, and the requested data is available immediately. When the EEPROM is read, the CPU is halted for four cycles before the next instruction is executed. The user should poll the EEPE bit before starting the read opera- tion. If a write operation is in progress, it is neither possible to read the EEPROM, nor to change the EEAR Register. 5.6.4 GPIOR2 – General Purpose I/O Register 2 5.6.5 GPIOR1 – General Purpose I/O Register 1 5.6.6 GPIOR0 – General Purpose I/O Register 0 Bit 765 432 10 0x15 (0x35) MSB LSB GPIOR2 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 765 432 10 0x14 (0x34) MSB LSB GPIOR1 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 765 432 10 0x13 (0x33) MSB LSB GPIOR0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 |
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