Datasheet

ManualsBrandsMicrochip ManualsAVR MicrocontrollersAVR RISC Microcontroller Flash 8KB TQFP 16MHz

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Figure 29-3. Programming the Flash Waveform

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

A B C D E B C D E G H

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

29.7.5 Programming the EEPROM

The EEPROM is organized in pages. 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 (For details on Command, Address and Data

loading, refer to Programming the Flash):

1. Step A: Load Command “0001 0001”.

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

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

4. Step C: Load Data (0x00 - 0xFF).

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

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

7. Step L: Program EEPROM page

7.1. Set BS1 to “0”.

7.2. Give WR a negative pulse. This starts programming of the EEPROM page. RDY/BSY goes

low.

7.3. Wait until to RDY/BSY goes high before programming the next page. Refer to the figure

below for signal waveforms.

AVR 8-Bit Microcontroller

MEMPROG- Memory Programming

Datasheet Complete

40001974A-page 297