ATtiny261A datasheet(176/292 Pages) ATMEL

Nome de Peças	ATtiny261A

Descrição Electrónicos	8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash

PDF	292 Pages

Scroll/Zoom	100%

Fabricante Electrônico	ATMEL [ATMEL Corporation]

Página de início	http://www.atmel.com

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176

8197A–AVR–10/09

ATtiny261A/461A/861A

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

The bit coding is shown in Table 18-14.

When pulsing WR or OE, the command loaded determines the action executed. The different

Commands are shown in Table 18-15.

Table 18-13. Pin Values Used to Enter Programming Mode

Symbol

Value

PAGEL/BS1

Prog_enable[3]

XA1/BS2

Prog_enable[2]

XA0

Prog_enable[1]

Prog_enable[0]

Table 18-14. 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 18-15. 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

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