Rainbow-electronics ATtiny861_V Manuel d'utilisateur télécharger pdf (Page 176)

176

2588B–AVR–11/06

ATtiny261/461/861

Figure 22-3. Programming the Flash Waveforms

(1)

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

22.7.5 Programming the EEPROM

The EEPROM is organized in pages, see Table 22-8 on page 171. 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 174 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 22-4 for

signal waveforms).

RDY/BSY

RESET +12V

0x10 ADDR. LOW

ADDR. HIGH

DATA

DATA LOW DATA HIGH

ADDR. LOW DATA LOW DATA HIGH

XA1/BS2

XA0

PAGEL/BS1

XTAL1

XX XX

ABCDEB CDEGH

1 2 ... 171 172 173 174 175 176 177 178 179 180 181 ... 235 236

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Rainbow-electronics ATtiny861_V Manuel d'utilisateur Page 176