ATTINY261_14 Datasheet, PDF (164/206 Pages) ATMEL Corporation – High Performance, Low Power AVR

K: Repeat 3 through 5 until the entire buffer is filled.
L: Program EEPROM page
1. Set BS 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 22-4 for signal waveforms).
Figure 22-4. Programming the EEPROM Waveforms
K
DATA
XA1/ BS2
XA0
A
G
B
C
E
B
C
E
L
0x11
ADDR. HIGH ADDR. LOW
DATA
XX
ADDR. LOW
DATA
XX
PAGEL/ BS1
XTAL
WR
RDY/ BSY
RESET +12V
OE
22.8.6 Reading the Flash
The algorithm for reading the flash memory is as follows (refer to Section 22.8.4 “Programming the Flash” on page 162 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 BS to “1”. The flash word high byte can now be read at DATA.
6. Set OE to “1”.
22.8.7 Reading the EEPROM
The algorithm for reading the EEPROM memory is as follows (refer to Section 22.8.4 “Programming the Flash” on page 162
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”.
22.8.8 Programming the Fuse Low Bits
The algorithm for programming the fuse low bits is as follows (refer to Section 22.8.4 “Programming the Flash” on page 162
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. Give WR a negative pulse and wait for RDY/BSY to go high.
164 ATtiny261/ATtiny461/ATtiny861/ATtiny461 [DATASHEET]
7753G–AVR–06/14