Техническая Спецификация для Atmel ATmega328P Xplained Mini MEGA328P-XMINI MEGA328P-XMINI

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ATmega48A/PA/88A/PA/168A/PA/328/P [DATASHEET]

Atmel-8271H-AVR- ATmega-Datasheet_08/2014

The following algorithm puts the device in Parallel (High-voltage) Programming mode:

1. Set Prog_enable pins listed in 

 to “0000”, RESET pin to 0V and V

CC

 to 0V. 

2.

Apply 4.5 - 5.5V between V

CC

 and GND.

Ensure that V

CC

 reaches at least 1.8V within the next 20 µs.

3.

Wait 20 - 60 µs, and apply 11.5 - 12.5V to RESET.

4.

Keep the Prog_enable pins unchanged for at least 10µs after the High-voltage has been applied to ensure 
the Prog_enable Signature has been latched. 

5.

Wait at least 300 µs before giving any parallel programming commands. 

6.

Exit Programming mode by power the device down or by bringing RESET pin to 0V.

Pin Values Used to Enter Programming Mode

PAGEL

Prog_enable[3]

0

XA1

Prog_enable[2]

0

XA0

Prog_enable[1]

0

BS1

Prog_enable[0]

0

XA1 and XA0 Coding

0

0

Load Flash or EEPROM Address (High or low address byte determined by BS1).

0

1

Load Data (High or Low data byte for Flash determined by BS1).

1

0

Load Command

1

1

No Action, Idle

Command Byte Bit Coding

1000 0000

Chip Erase

0100 0000

Write Fuse bits

0010 0000

Write Lock bits

0001 0000

Write Flash

0001 0001

Write EEPROM

0000 1000

Read Signature Bytes and Calibration byte

0000 0100

Read Fuse and Lock bits

0000 0010

Read Flash

0000 0011

Read EEPROM