Datasheet

105
ATtiny13
2535E–AVR–10/04
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 High-voltage Programming mode, also when
the device is locked. The three bytes reside in a separate address space.
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-
lator. This byte resides in the high byte of address 0x000. During reset, this byte is
automatically written into the OSCCAL Register to ensure correct frequency of the cali-
brated RC Oscillator.
Page Size
Table 46. No. of Words in a Page and No. of Pages in the Flash
Flash Size Page Size PCWORD No. of Pages PCPAGE PCMSB
512 words (1K byte) 16 words PC[3:0] 32 PC[8:4] 8
Table 47. No. of Words in a Page and No. of Pages in the EEPROM
EEPROM Size Page Size PCWORD No. of Pages PCPAGE EEAMSB
64 bytes 4 bytes EEA[1:0] 16 EEA[5:2] 5