Rainbow-electronics ATmega128L Uživatelský manuál stáhnout pdf (Strana 287)

287

ATmega128(L)

2467B–09/01

Figure 137. Programming the Flash Waveforms

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

Programming the EEPROM The EEPROM is organized in pages, see Table 125 on page 284. 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 285 for details on

Command, Address and Data loading):

1. A: Load Command “0001 0001”.

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

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

4. C: Load Data ($00 - $FF)

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

K: Repeat 3 through 5 until the entire buffer is filled

L: Program EEPROM page

1. Set BS1 to “0”.

2. Give WR

a negative pulse. This starts programming of the EEPROM page.

RDY/BSY

goes low.

3. Wait until to RDY/BSY goes high before programming the next page.

(See

Figure 138 for signal waveforms)

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

AB CDEB CDEGH

1 2 ... 282 283 284 285 286 287 288 289 290 291 292 ... 330 331

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Rainbow-electronics ATmega128L Uživatelský manuál Strana 287