ATTINY26L8SU SL383 Atmel, ATTINY26L8SU SL383 Datasheet - Page 114

• Manufacturer Part Number: ATTINY26L8SU SL383
• Description: MCU 8-Bit ATtiny AVR RISC 2KB Flash 3.3V/5V 20-Pin SOIC T/R
• Manufacturer: Atmel

Parallel Programming
Enter Programming Mode
Considerations for Efficient
Programming
114
ATtiny26(L)
The following algorithm puts the device in parallel programming mode:
Step 2-7 must be completed within 64ms.
1. Set Prog_enable pins listed in Table 55 on page 112, RESET and Vcc to 0V.
2. Apply 4.5 - 5.5V between Vcc/AVcc and GND.
3. Wait at least 60us.
4. Apply between 4.5V - 5.5V (Same as on Vcc/AVcc) to RESET pin.
5. Wait at least 20us.
6. Apply between 11.5V - 12.5V to RESET pin.
7. Wait at least 10us.
8. Program fuses to internal clock mode, 8 MHz, with 64ms delay. (CKSEL[3..0] =
9. Exit Programming mode by power the device down or by bringing RESET pin to
10. Repeat step 1 to 7 too re-enter programming mode.
The loaded command and address are retained in the device during programming. For
efficient programming, the following should be considered.
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•
•
0100, SUT[1..0] = 10). If Lock bits are programmed, a Chip Erase command
must be executed before changing the fuses.
0V.
The command needs only be loaded once when writing or reading multiple memory
locations.
Skip writing the data value $FF, that is the contents of the entire EEPROM (unless
the EESAVE Fuse is programmed) and Flash after a Chip Erase.
Address high byte needs only be loaded before programming or reading a new 256-
word window in Flash or 256-byte EEPROM. This consideration also applies to
Signature bytes reading.
1477J–AVR–06/07