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AT90PWM2 Datasheet(PDF) 291 Page - ATMEL Corporation |
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AT90PWM2 Datasheet(HTML) 291 Page - ATMEL Corporation |
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291 / 365 page  291 AT90PWM2/3 4317B–AVR–02/05 Latching of Fuses The fuse values are latched when the device enters programming mode and changes of the fuse values will have no effect until the part leaves Programming mode. This does not apply to the EESAVE Fuse which will take effect once it is programmed. The fuses are also latched on Power-up in Normal mode. Signature Bytes All Atmel microcontrollers have a three-byte signature code which identifies the device. This code can be read in both serial and parallel mode, also when the device is locked. The three bytes reside in a separate address space. Signature Bytes For the AT90PWM2/3 the signature bytes are: 1. 0x000: 0x1E (indicates manufactured by Atmel). 2. 0x001: 0x93 (indicates 8KB Flash memory). 3. 0x002: 0x81 (indicates AT90PWM2/3 device when 0x001 is 0x93). Calibration Byte The AT90PWM2/3 has a byte calibration value for the internal RC Oscillator. This byte resides in the high byte of address 0x000 in the signature address space. During reset, this byte is automatically written into the OSCCAL Register to ensure correct frequency of the calibrated RC Oscillator. |
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