Datasheet

152
2586D–AVR–02/06
ATtiny25/45/85
23.4 Calibration Byte
Signature area of the ATtiny25/45/85 has one byte of calibration data for the internal RC Oscilla-
tor. 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 calibrated RC Oscillator.
23.5 Page Size
Table 23-6. No. of Words in a Page and No. of Pages in the Flash
Device Flash Size Page Size PCWORD No. of Pages PCPAGE PCMSB
ATt iny 25
1K words
(2K bytes)
16 words PC[3:0] 64 PC[9:4] 9
ATt iny 45
2K words
(4K bytes)
32 words PC[4:0] 64 PC[10:5] 10
ATt iny 85
4K words
(8K bytes)
32 words PC[4:0] 128 PC[11:5] 11
Table 23-7. No. of Words in a Page and No. of Pages in the EEPROM
Device
EEPROM
Size Page Size PCWORD No. of Pages PCPAGE EEAMSB
ATtiny25 128 bytes 4 bytes EEA[1:0] 32 EEA[6:2] 6
ATtiny45 256 bytes 4 bytes EEA[1:0] 64 EEA[7:2] 7
ATtiny85 512 bytes 4 bytes EEA[1:0] 128 EEA[8:2] 8