ATMEGA64L-8MI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA64L-8MI

8-bit AVR® Microcontroller with 64K Bytes In-System Programmable Flash

Atmel Corporation 

ATmega64(L)

Table 121. Pin Name Mapping

Signal Name in

Programming Mode Pin Name I/O Function

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

PA0

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

high byte)

DATA

PB7 - 0 I/O Bi-directional Data bus (Output when OE is low)

Table 122. Pin Values Used to Enter Programming Mode

Pin

Symbol

PAGEL

Prog_enable[3]

XA1

Prog_enable[2]

XA0

Prog_enable[1]

BS1

Prog_enable[0]

Value

0

0

0

0

Table 123. XA1 and XA0 Coding

XA1 XA0 Action when XTAL1 is Pulsed

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

2490G–AVR–03/04

295

Share Link: