ATtiny167 datasheet(235/282 Pages) ATMEL

235 / 282 page

235

7728D–AVR–07/09

ATtiny87/ATtiny167

Figure 21-4. Programming the EEPROM Waveforms

21.7.6

Reading the Flash

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

page 232 for details on Command and Address loading):

A: Load Command “0000 0010

b”.

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”.

21.7.7

Reading the EEPROM

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

Flash” on page 232 for details on Command and Address loading):

A: Load Command “0000 0011

b”.

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

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

Set OE to “0”, and BS1 to “0”. The EEPROM Data byte can now be read at DATA.

Set OE to “1”.

21.7.8

Programming the Fuse Low Bits

The algorithm for programming the Fuse Low bits is as follows (refer to “Programming the

Flash” on page 232 for details on Command and Data loading):

A: Load Command “0100 0000

b”.

C: Load Data Low Byte. Bit n = “0” programs and bit n = “1” erases the Fuse bit.

Give WR a negative pulse and wait for RDY/BSY to go high.

0x11

ADDR. HIGH

ADDR. LOW

DATA

ADDR. LOW

DATA

RDY/BSY

RESET +12V

DATA

XA1 / BS2

XA0

PAGEL / BS1

XTAL1

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