ATmega1284P datasheet(298/380 Pages) ATMEL

298 / 380 page

298

8059D–AVR–11/09

ATmega1284P

Give XTAL1 a positive pulse. This loads the command.

B. Load Address Low byte (Address bits 7..0)

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

Set BS2, BS1 to “00”. This selects the address low byte.

Set DATA = Address low byte (0x00 - 0xFF).

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 (0x00 - 0xFF).

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 (0x00 - 0xFF).

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 25-3 on page 299

for signal waveforms)

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

While the lower bits in the address are mapped to words within the page, the higher bits address

the pages within the FLASH. This is illustrated in Figure 25-2 on page 299. Note that if less than

eight bits are required to address words in the page (pagesize < 256), the most significant bit(s)

in the address low byte are used to address the page when performing a Page Write.

G. Load Address High byte (Address bits15..8)

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

Set BS2, BS1 to “01”. This selects the address high byte.

Set DATA = Address high byte (0x00 - 0xFF).

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

H. Load Address Extended High byte (Address bits 23..16)

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

Set BS2, BS1 to “10”. This selects the address extended high byte.

Set DATA = Address extended high byte (0x00 - 0xFF).

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

I. Program Page

Set BS2, BS1 to “00”

Give WR a negative pulse. This starts programming of the entire page of data. RDY/BSY

goes low.

Wait until RDY/BSY goes high (See Figure 25-3 on page 299 for signal waveforms).

J. Repeat B through I until the entire Flash is programmed or until all data has been

programmed.

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