22.4Calibration Byte

Signature area of the ATtiny25/45/85 has one byte of calibration data for the internal RC Oscillator. 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.

22.5Page Size

	Table 22-6.	No. of Words in a Page and No. of Pages in the Flash
	Device	Flash Size	Page Size	PCWORD	No. of Pages	PCPAGE	PCMSB
	ATtiny25	1K words	16 words	PC[3:0]	64	PC[9:4]	9
		(2K bytes)
	ATtiny45	2K words	32 words	PC[4:0]	64	PC[10:5]	10
		(4K bytes)
	ATtiny85	4K words	32 words	PC[4:0]	128	PC[11:5]	11
		(8K bytes)

Table 22-7.	No. of Words in a Page and No. of Pages in the EEPROM
	EEPROM
Device	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

152 ATtiny25/45/85

2586A–AVR–02/05