Rainbow-electronics ATtiny43U Uživatelský manuál stáhnout pdf (Strana 148)

148

8048B–AVR–03/09

ATtiny43U

5. E: No action.

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

L: Program EEPROM page

1. Set BS1 to “0”.

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 19-4

for signal waveforms).

Figure 19-4. Programming the EEPROM Waveforms

19.6.6 Reading the Flash

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

page 145 for details on Command and Address loading):

1. A: Load Command “0000 0010”.

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

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

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”.

19.6.7 Reading the EEPROM

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

on page 145 for details on Command and Address loading):

1. A: Load Command “0000 0011”.

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

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

4. Set OE

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

5. Set OE

to “1”.

RDY/BSY

RESET +12V

0x11 ADDR. HIGH

DATA

ADDR. LOW DATA ADDR. LOW DATA XX

XA1/BS2

XA0

PAGEL/BS1

CLKI

AGBCEB C EL

1 2 ... 143 144 145 146 147 148 149 150 151 152 153 ... 181 182

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