Rainbow-electronics ATmega162V Manual de usuario descargar pdf (Pagina 238)

238

ATmega162/V

2513E–AVR–09/03

Figure 98. 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 107 on page 235. 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 236 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).

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

L: Program EEPROM page

1. Set BS 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 99 for signal waveforms).

RDY/BSY

RESET +12V

PAGEL

BS2

0x10 ADDR. LOW

ADDR. HIGH

DATA

DATA L OW DATA H IG H ADDR. LOW DATA LOW DATA HIGH

XA1

XA0

BS1

XTAL1

XX XX

ABCDEBCDEGH

1 2 ... 233 234 235 236 237 238 239 240 241 242 243 ... 322 323

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Rainbow-electronics ATmega162V Manual de usuario Pagina 238