Rainbow-electronics ATmega64C1 Manuel d'utilisateur télécharger pdf (Page 299)

100

101

299

7647A–AVR–02/08

ATmega32/64/M1/C1

Figure 24-3. Programming the Flash Waveforms

(1)

Note: 1. “XX” is don’t care. The letters refer to the programming description above.

24.8.5 Programming the EEPROM

The EEPROM is organized in pages, see Table 24-13 on page 295. 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 297 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 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 24-4 for

signal waveforms).

RDY/BSY

RESET +12V

PAGEL

BS2

0x10 ADDR. LOW

ADDR. HIGH

DATA

DATA LOW DATA HIGH

ADDR. LOW DATA LOW DATA HIGH

XA1

XA0

BS1

XTAL1

XX XX

ABCDEBCDEGH

1 2 ... 294 295 296 297 298 299 300 301 302 303 304 ... 365 366

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Rainbow-electronics ATmega64C1 Manuel d'utilisateur Page 299

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