Datasheet

180
8197C–AVR–05/11
ATtiny261A/461A/861A
Figure 18-4. Addressing the Flash Which is Organized in Pages
Note: PCPAGE and PCWORD are listed in Table 18-7 on page 171.
In the figure below, “XX” means don’t care. The numbers in the figure refer to the programming
description above.
WR
Figure 18-5. Flash Programming Waveforms
18.7.6 Programming the EEPROM
The EEPROM is organized in pages, see Table 18-8 on page 171. When programming the
EEPROM, the program data is latched into a page buffer. This allows one page of data to be
PROGRAM MEMORY
WORD ADDRESS
WITHIN A PAGE
PAGE ADDRESS
WITHIN THE FLASH
INSTRUCTION WORD
PAG E
PCWORD[PAGEMSB:0]:
00
01
02
PAGEEND
PAG E
PCWORDPCPAGE
PCMSB
PAGEMSB
PROGRAM
COUNTER
0x10 ADDR. LOW DATA LOW ADDR. HIGHDATA HIGHDATA LOWADDR. LOWDATA HIGHDATA
XA1 / BS2
XA0
PAGEL / BS1
XTAL1
WR
RDY / BSY
RESET +12V
OE
XXX
1
STEP
7
5
6432432
8
0x00
9