ATtiny261A datasheet(172/292 Pages) ATMEL

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172

8197A–AVR–10/09

ATtiny261A/461A/861A

interface before the Flash write operation completes can result in incorrect

programming.

5. A: The EEPROM array is programmed one byte at a time by supplying the address and

data together with the appropriate Write instruction. An EEPROM memory location is

first automatically erased before new data is written. If polling (RDY/BSY) is not used,

the user must wait at least tWD_EEPROM before issuing the next byte. (See Table 18-10.)

In a chip erased device, no 0xFFs in the data file(s) need to be programmed.

B: The EEPROM array is programmed one page at a time. The Memory page is loaded

one byte at a time by supplying the 2 LSB of the address and data together with the

Load EEPROM Memory Page instruction. The EEPROM Memory Page is stored by

loading the Write EEPROM Memory Page Instruction with the 6 MSB of the address.

When using EEPROM page access only byte locations loaded with the Load EEPROM

Memory Page instruction is altered. The remaining locations remain unchanged. If poll-

ing (RDY/BSY) is not used, the used must wait at least tWD_EEPROM before issuing the

next page (See Table 18-8). In a chip erased device, no 0xFF in the data file(s) need to

be programmed.

6. Any memory location can be verified by using the Read instruction which returns the

content at the selected address at serial output MISO.

7. At the end of the programming session, RESET can be set high to commence normal

operation.

8. Power-off sequence (if needed):

Set RESET to “1”.

Turn VCC power off.

18.6.2

Serial Programming Instruction set

The instruction set is described in Table 18-11 and Figure 18-2 on page 174.

Table 18-10. Minimum Wait Delay Before Writing the Next Flash or EEPROM Location

Symbol

Minimum Wait Delay

tWD_FLASH

4.5 ms

tWD_EEPROM

4.0 ms

tWD_ERASE

4.0 ms

tWD_FUSE

4.5 ms

Table 18-11. Serial Programming Instruction Set

Instruction/Operation

Instruction Format

Byte 1

Byte 2

Byte 3

Byte4

Programming Enable

$AC

$53

$00

Chip Erase (Program Memory/EEPROM)

$AC

$80

$00

Poll RDY/BSY

$F0

$00

data byte out

Load Instructions

Load Extended Address byte(1)

$4D

$00

Extended adr

$00

Load Program Memory Page, High byte

$48

adr MSB

adr LSB

high data byte in

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