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ATtiny13 |
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Latching of Fuses |
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The fuse values are latched when the device enters programming mode and changes of |
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the fuse values will have no effect until the part leaves Programming mode. This does |
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not apply to the EESAVE Fuse which will take effect once it is programmed. The fuses |
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are also latched on Power-up in Normal mode. |
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Signature Bytes |
All Atmel microcontrollers have a three-byte signature code which identifies the device. |
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This code can be read in both serial and High-voltage Programming mode, also when |
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the device is locked. The three bytes reside in a separate address space. |
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For the ATtiny13 the signature bytes are:
1.0x000: 0x1E (indicates manufactured by Atmel).
2.0x001: 0x90 (indicates 1 KB Flash memory).
3.0x002: 0x07 (indicates ATtiny13 device when 0x001 is 0x90).
Calibration Byte |
Signature area of the ATtiny13 has one byte of calibration data for the internal RC Oscil- |
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lator. This byte resides in the high byte of address 0x000. During reset, this byte is |
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automatically written into the OSCCAL Register to ensure correct frequency of the cali- |
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brated RC Oscillator. |
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Page Size |
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Table 47. No. of Words in a Page and No. of Pages in the Flash |
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Flash Size |
Page Size |
PCWORD |
No. of Pages |
PCPAGE |
PCMSB |
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512 words (1K byte) |
16 words |
PC[3:0] |
32 |
PC[8:4] |
8 |
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Table 48. No. of Words in a Page and No. of Pages in the EEPROM |
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EEPROM Size |
Page Size |
PCWORD |
No. of Pages |
PCPAGE |
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EEAMSB |
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64 bytes |
4 bytes |
EEA[1:0] |
16 |
EEA[5:2] |
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5 |
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101
2535A–AVR–06/03