Rainbow Electronics ATmega128RFA1 - Manual (Page 472)

472
8266A-MCU Wireless-12/09
ATmega128RFA1
Figure 31-5. Addressing the Flash which is Organized in Pages
(1)
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
Note: 1. PCPAGE and PCWORD are listed in Table 31-7 on page 467.
Figure 31-3. Programming the Flash Waveforms
(1)
Note: 1. “XX” is don’t care. The letters refer to the programming description above.
31.7.5 Programming the EEPROM
The EEPROM is organized in pages; see Table 31-8 on page 467. 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 470 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).
5. E: Latch data (give PAGEL a positive pulse).