ATmega16 datasheet(258/315 Pages) ATMEL

258 / 315 page

258

ATmega16(L)

2466E–AVR–10/02

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 107. 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 108. 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 109. 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

0000 1000

Read Signature Bytes and Calibration byte

0000 0100

Read Fuse and Lock bits

0000 0010

Read Flash

0000 0011

Read EEPROM

Table 110. No. of Words in a Page and no. of Pages in the Flash

Flash Size

Page Size

PCWORD

No. of Pages

PCPAGE

PCMSB

8K words (16K bytes)

64 words

PC[5:0]

128

PC[12:6]

Table 106. Pin Name Mapping (Continued)

Signal Name in

Programming Mode

Pin Name

I/O

Function

ATMEGA16 Datasheet(PDF) 258 Page - ATMEL Corporation

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