Rainbow-electronics ATmega8515L Instrukcja Użytkownika Pobierz pdf (Strona 183)

183

ATmega8515(L)

2512A–AVR–04/02

Figure 76. Programming the Flash Waveforms

Note: “XX”isdon’t care. The letters refer to the programming description above.

Programming the EEPROM The EEPROM is organized in pages, see Table 90onpage 179. When programming

the EEPROM, the program data islatched into a page buffer.This allows one page of

data to be programmedsimultaneously.The programming algorithm for the EEPROM

data memory is asfollows (refer to “Programming the Flash”onpage 181 fordetails on

Command, Address andData loading):

1. A:LoadCommand “0001 0001”.

2. G: Load Address HighByte ($00 -$FF).

3. B: Load Address LowByte ($00 -$FF).

4. C: LoadData ($00 -$FF).

5. E: Latch data (give PAGEL a positive pulse).

K: Repeat 3 through 5until the entire buffer isfilled.

L: Program EEPROM page.

1. Set BS1to“0”.

2. Give WR

a negative pulse. Thisstartsprogramming of the EEPROM page.

RDY/BSY

goeslow.

3. Wait until to RDY/BSY

goeshighbefore programming thenext page.

(See Figure 77 forsignalwaveforms.)

RDY/BSY

RESET +12V

PAGEL

BS2

$10 ADDR. LOW

ADDR. HIGH

DATA

DATA LOW DATA HIGH ADDR. LOW DATA LOW DATA HIGH

XA1

XA0

BS1

XTAL1

XX XX

ABCDEBCDEGH

1 2 ... 178 179 180 181 182 183 184 185 186 187 188 ... 222 223

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Rainbow-electronics ATmega8515L Instrukcja Użytkownika Strona 183