Rainbow-electronics Atmega169L Manuel d'utilisateur télécharger pdf (Page 274)

274

ATmega169V/L

2514A–AVR–08/02

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

121 for signal waveforms).

Figure 121. Programming the EEPROM Waveforms

Reading the Flash The algorithm for reading the Flash memory is as follows (refer to “Programming the

Flash” on page 271 for details on Command and Address loading):

1. A: Load Command “0000 0010”.

2. G: Load Address High Byte (0x00 - 0xFF).

3. B: Load Address Low Byte (0x00 - 0xFF).

4. Set OE

to “0”, and BS1 to “0”. The Flash word low byte can now be read at

DATA.

5. Set BS to “1”. The Flash word high byte can now be read at DATA.

6. Set OE

to “1”.

Reading the EEPROM The algorithm for reading the EEPROM memory is as follows (refer to “Programming the

Flash” on page 271 for details on Command and Address loading):

1. A: Load Command “0000 0011”.

2. G: Load Address High Byte (0x00 - 0xFF).

3. B: Load Address Low Byte (0x00 - 0xFF).

4. Set OE

to “0”, and BS1 to “0”. The EEPROM Data byte can now be read at

DATA.

5. Set OE

to “1”.

RDY/BSY

RESET +12V

PAGEL

BS2

0x11 ADDR. HIGH

DATA

ADDR. LOW DATA ADDR. LOW DATA XX

XA1

XA0

BS1

XTAL1

AGBCEB C EL

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Rainbow-electronics Atmega169L Manuel d'utilisateur Page 274

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