Rainbow-electronics ATtiny26L Instrukcja Użytkownika Pobierz pdf (Strona 115)

115

ATtiny26(L)

1477B–AVR–04/02

Figure 61. Programming the EEPROM Waveforms

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

Flash” on page 112 for details on Command and Address loading):

1. A: Load Command “0000 0010”.

2. F: Load Address High Byte ($00 - $03).

3. B: Load Address Low Byte ($00 - $FF).

4. Set OE

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

DATA.

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

6. Set OE

to “1”.

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

Flash” on page 112 for details on Command and Address loading):

1. A: Load Command “0000 0011”.

2. B: Load Address Low Byte ($00 - $FF).

3. Set OE

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

DATA.

4. Set OE

to “1”.

Programming the Fuse Low

Bits

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

the Flash” on page 112 for details on Command and Data loading):

1. A: Load Command “0100 0000”.

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

3. Set BS1 and BS2 to “0”.

4. Give WR

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

$10 ADDR. LOW DATA ADDR. LOW DATA XX

AB C B C K

RDY/BSY

RESET +12V

DATA

XA1/BS2

XA0

PAGEL/BS1

XTAL1

1 2 ... 110 111 112 113 114 115 116 117 118 119 120 ... 150 151

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Rainbow-electronics ATtiny26L Instrukcja Użytkownika Strona 115