ATmega16U2 datasheet(255/314 Pages) ATMEL

255 / 314 page

255

7799B–AVR–07/09

ATmega8U2/16U2/32U2

Figure 25-3. Programming the Flash Waveforms

(1)

Note:

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

25.7.5

Programming the EEPROM

The EEPROM is organized in pages, see Table 25-8 on page 249. 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 253 for details on Command, Address and

Data loading):

A: Load Command “0001 0001”.

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

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

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

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

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

L: Program EEPROM page

Set BS2, BS1 to “00”.

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

goes low.

Wait until to RDY/BSY goes high before programming the next page (See Figure 25-4

for signal waveforms).

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

ADDR. EXT.H

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