Rainbow Electronics ATtiny43U - Manual (Page 147)

147
8048B–AVR–03/09
Figure 19-2. Addressing the Flash Which is Organized in Pages (1)
Note: 1. PCPAGE and PCWORD are listed in Table 19-8 on page 142 .
Figure 19-3. Programming the Flash Waveforms (1)
Note: 1. “XX” is don’t care. The letters refer to the programming description above.
19.6.5 Programming the EEPROM
The EEPROM is organized in pages, see Table 19-9 on page 142 . When programming the
EEPROM, the program data is latched into a page buffer. This allows one page of data to be
programmed simultaneously. The programming algorithm for the EEPROM data memory is as
follows (refer to
“Programming the Flash” on page 145 for details on Command, Address and
Data loading):
1. A: Load Command “0001 0001”.
2. G: Load Address High Byte (0x00 - 0xFF).
3. B: Load Address Low Byte (0x00 - 0xFF).
4. C: Load Data (0x00 - 0xFF).
PROGRAM MEMORY
WORD ADDRESS
WITHIN A PAGE PAGE ADDRESS
WITHIN THE FLASH
INSTRUCTION WORD
PAGE PCWORD[PAGEMSB:0]:
00
01
02
PAGEEND
PAGE
PCWORD PCPAGE
PCMSB PAGEMSB
PROGRAM
COUNTER
RDY/BSY
WR
OE
RESET +12V
0x10 ADDR. LOW ADDR. HIGH DATA DATA LOW DATA HIGH ADDR. LOW DATA LOW DATA HIGH
XA1/BS2
XA0
PAGEL/BS1
CLKI
XX XX XX
A B C D E B C D E G H
F