AT90PWM2 datasheet(298/365 Pages) ATMEL

298 / 365 page

298

AT90PWM2/3

4317B–AVR–02/05

Programming the EEPROM

The EEPROM is organized in pages, see Table 128 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 “Programming the Flash” on page 296 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 BS1 to “0”.

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

139 for signal waveforms).

Figure 139. Programming the EEPROM Waveforms

Reading the Flash

The algorithm for reading the Flash memory is as follows (refer to “Programming the

Flash” on page 296 for details on Command and Address loading):

A: Load Command “0000 0010”.

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

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

Set OE to “0”, and BS1 to “0”. The Flash word low byte can now be read at

DATA.

Set BS1 to “1”. The Flash word high byte can now be read at DATA.

Set OE to “1”.

Reading the EEPROM

The algorithm for reading the EEPROM memory is as follows (refer to “Programming the

Flash” on page 296 for details on Command and Address loading):

RDY/BSY

RESET +12V

PAGEL

BS2

0x11

ADDR. HIGH

DATA

ADDR. LOW

DATA

ADDR. LOW

DATA

XA1

XA0

BS1

XTAL1

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