ATMEGA164P_0702 Datasheet, PDF(300/408 Page) ATMEL Corporation – 8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash

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ATMEGA164P_0702 Datasheet, PDF (300/408 Pages) ATMEL Corporation – 8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash

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Figure 25-3. Programming the Flash Waveforms(1)

F

DATA

XA1

XA0

BS1

BS2

XTAL1

WR

RDY/BSY

RESET +12V

OE

PAGEL

A

B

C

D

E

B

C

D

E

G

H

I

0x10

ADDR. LOW DATA LOW DATA HIGH XX

ADDR. LOW DATA LOW DATA HIGH

XX

ADDR. HIGH ADDR. EXT.H XX

Note: 1. âXXâ is donât 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 294. 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 âProgramming the Flashâ on page 298 for details on Command, Address and

Data loading):

1. A: Load Command â0001 0001â.

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

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

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

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

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

L: Program EEPROM page

1. Set BS2, BS1 to â00â.

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 25-4 for

signal waveforms).

300 ATmega164P/324P/644P

8011DâAVRâ02/07

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