Rainbow Electronics ATtiny26L - Manual (Page 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
A B C B C K
J
RDY/BSY
WR
OE
RESET +12V
DATA
XA1/BS2
XA0
PAGEL/BS1
XTAL1