ATmega16 datasheet(260/315 Pages) ATMEL

260 / 315 page

260

ATmega16(L)

2466E–AVR–10/02

Chip Erase

The Chip Erase will erase the Flash and EEPROM(1) memories plus Lock bits. The Lock

bits are not reset until the program memory has been completely erased. The Fuse bits

are not changed. A Chip Erase must be performed before the Flash and/or the

EEPROM are reprogrammed.

Note:

1. The EEPRPOM memory is preserved during chip erase if the EESAVE Fuse is

programmed.

Load Command “Chip Erase”

Set XA1, XA0 to “10”. This enables command loading.

Set BS1 to “0”.

Set DATA to “1000 0000”. This is the command for Chip Erase.

Give XTAL1 a positive pulse. This loads the command.

Give WR a negative pulse. This starts the Chip Erase. RDY/BSY goes low.

Wait until RDY/BSY goes high before loading a new command.

Programming the Flash

The Flash is organized in pages, see Table 110 on page 258. When programming the

Flash, the program data is latched into a page buffer. This allows one page of program

data to be programmed simultaneously. The following procedure describes how to pro-

gram the entire Flash memory:

A. Load Command “Write Flash”

Set XA1, XA0 to “10”. This enables command loading.

Set BS1 to “0”.

Set DATA to “0001 0000”. This is the command for Write Flash.

Give XTAL1 a positive pulse. This loads the command.

B. Load Address Low byte

Set XA1, XA0 to “00”. This enables address loading.

Set BS1 to “0”. This selects low address.

Set DATA = Address low byte ($00 - $FF).

Give XTAL1 a positive pulse. This loads the address low byte.

C. Load Data Low Byte

Set XA1, XA0 to “01”. This enables data loading.

Set DATA = Data low byte ($00 - $FF).

Give XTAL1 a positive pulse. This loads the data byte.

D. Load Data High Byte

Set BS1 to “1”. This selects high data byte.

Set XA1, XA0 to “01”. This enables data loading.

Set DATA = Data high byte ($00 - $FF).

Give XTAL1 a positive pulse. This loads the data byte.

E. Latch Data

Set BS1 to “1”. This selects high data byte.

Give PAGEL a positive pulse. This latches the data bytes. (See Figure 129 for

signal waveforms)

F. Repeat B through E until the entire buffer is filled or until all data within the page is

loaded.

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