ATmega32A datasheet(270/352 Pages) ATMEL

270 / 352 page

270

8155B–AVR–07/09

ATmega32A

Table 26-7.

Pin Name Mapping

Signal Name in

Programming Mode

Name

I/O

Function

RDY/BSY

PD1

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

new command

PD2

Output Enable (Active low)

PD3

Write Pulse (Active low)

BS1

PD4

Byte Select 1 (“0” selects low byte, “1” selects high

byte)

XA0

PD5

XTAL Action Bit 0

XA1

PD6

XTAL Action Bit 1

PAGEL

PD7

Program Memory and EEPROM data Page Load

BS2

PA0

Byte Select 2 (“0” selects low byte, “1” selects 2’nd high

byte)

DATA

PB7-0

I/O

Bidirectional Data bus (Output when OE is low)

Table 26-8.

Pin Values used to Enter Programming Mode

Symbol

Value

PAGEL

Prog_enable[3]

XA1

Prog_enable[2]

XA0

Prog_enable[1]

BS1

Prog_enable[0]

Table 26-9.

XA1 and XA0 Coding

XA1

XA0

Action when XTAL1 is Pulsed

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

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

Load Command

No Action, Idle

Table 26-10. Command Byte Bit Coding

Command Byte

Command Executed

1000 0000

Chip Erase

0100 0000

Write Fuse Bits

0010 0000

Write Lock Bits

0001 0000

Write Flash

0001 0001

Write EEPROM

ATmega32A Datasheet(PDF) 270 Page - ATMEL Corporation

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