Atmel ATmega328P Xplained Mini MEGA328P-XMINI MEGA328P-XMINI Data Sheet

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

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

The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a positive pulse. The bit coding 
is shown in 

When pulsing WR or OE, the command loaded determines the action executed. The different Commands are 
shown in 

.

Note:

V

CC

 - 0.3V < AV

CC

 < V

CC

 + 0.3V, however, AV

CC

 should always be within 4.5 - 5.5V

Pin Name Mapping 

RDY/BSY

PD1

O

0: Device is busy programming, 1: Device is 
ready for new command

OE

PD2

I

Output Enable (Active low)

WR

PD3

I

Write Pulse (Active low)

BS1

PD4

I

Byte Select 1 (“0” selects Low byte, “1” selects 
High byte)

XA0

PD5

I

XTAL Action Bit 0

XA1

PD6

I

XTAL Action Bit 1

PAGEL

PD7

I

Program memory and EEPROM Data Page 
Load

BS2

PC2

I

Byte Select 2 (“0” selects Low byte, “1” selects 
2’nd High byte)

DATA

{PC[1:0]: PB[5:0]}

I/O

Bi-directional Data bus (Output when OE is low)

VCC

GND

XTAL1

PD1

PD2

PD3

PD4

PD5

PD6

 PC[1:0]:PB[5:0]

DATA

RESET

PD7

+12 V

BS1

XA0

XA1

OE

RDY/BSY

PAGEL

PC2

WR

BS2

AVCC

+4.5 - 5.5V

+4.5 - 5.5V