ATtiny261A datasheet(173/292 Pages) ATMEL

173 / 292 page

173

8197A–AVR–10/09

ATtiny261A/461A/861A

Notes: 1. Not all instructions are applicable for all parts.

2. a = address

3. Bits are programmed ‘0’, unprogrammed ‘1’.

4. To ensure future compatibility, unused Fuses and Lock bits should be unprogrammed (‘1’) .

5. Refer to the correspondig section for Fuse and Lock bits, Calibration and Signature bytes and Page size.

6. Instructions accessing program memory use a word address. This address may be random within the page range.

7. See http://www.atmel.com/avr for Application Notes regarding programming and programmers.

If the LSB in RDY/BSY data byte out is ‘1’, a programming operation is still pending. Wait until

this bit returns ‘0’ before the next instruction is carried out.

Within the same page, the low data byte must be loaded prior to the high data byte.

After data is loaded to the page buffer, program the EEPROM page, see Figure 18-2 on page

174.

Load Program Memory Page, Low byte

$40

adr MSB

adr LSB

low data byte in

Load EEPROM Memory Page (page access)

$C1

$00

0000 000aa

data byte in

Read Instructions

Read Program Memory, High byte

$28

adr MSB

adr LSB

high data byte out

Read Program Memory, Low byte

$20

adr MSB

adr LSB

low data byte out

Read EEPROM Memory

$A0

$00

00aa aaaa

data byte out

Read Lock bits

$58

$00

data byte out

Read Signature Byte

$30

$00

0000 000aa

data byte out

Read Fuse bits

$50

$00

data byte out

Read Fuse High bits

$58

$08

$00

data byte out

Read Extended Fuse Bits

$50

$08

$00

data byte out

Read Calibration Byte

$38

$00

data byte out

Write Instructions(6)

Write Program Memory Page

$4C

adr MSB

adr LSB

$00

Write EEPROM Memory

$C0

$00

00aa aaaa

data byte in

Write EEPROM Memory Page (page access)

$C2

$00

00aa aa00

$00

Write Lock bits

$AC

$E0

$00

data byte in

Write Fuse bits

$AC

$A0

$00

data byte in

Write Fuse High bits

$AC

$A8

$00

data byte in

Write Extended Fuse Bits

$AC

$A4

$00

data byte in

Table 18-11. Serial Programming Instruction Set (Continued)

Instruction/Operation

Instruction Format

Byte 1

Byte 2

Byte 3

Byte4

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