
150
8048C–AVR–02/12
ATtiny43U
Figure 19-4. Programming the EEPROM Waveforms
19.6.6
Reading the Flash
page 147 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
on page 147 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”.
19.6.8
Programming the Fuse Low Bits
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.
Give WR a negative pulse and wait for RDY/BSY to go high.
RDY/BSY
WR
OE
RESET +12V
0x11
ADDR. HIGH
DATA
ADDR. LOW
DATA
ADDR. LOW
DATA
XX
XA1/BS2
XA0
PAGEL/BS1
CLKI
XX
AG
B
C
E
B
C
E
L
K