ATtiny45 datasheet(140/196 Pages) ATMEL

140 / 196 page

140

7598H–AVR–07/09

ATtiny25/45/85

Figure 21-2. Serial Programming Waveforms

Table 21-9.

Minimum Wait Delay Before Writing the Next Flash or EEPROM Location

Symbol

Minimum Wait Delay

tWD_FLASH

4.5 ms

WD_EEPROM

4.0 ms

tWD_ERASE

4.0 ms

WD_FUSE

4.5 ms

Table 21-10. Serial Programming Instruction Set

Instruction

Instruction Format

Operation

Byte 1

Byte 2

Byte 3

Byte4

Programming Enable

1010

1100

0101

0011

xxxx

Enable Serial Programming

after RESET goes low.

Chip Erase

1010

1100

100x

xxxx

Chip Erase EEPROM and

Flash.

Read Program

Memory

0010

000

0000

000a

bbbb

oooo

Read H (high or low) data o

from Program memory at

word address a:b.

Load Program

Memory Page

0100

000

000x

xxxx

xxxb

bbbb

iiii

Write H (high or low) data i to

Program memory page at

word address b. Data low

byte must be loaded before

Data high byte is applied

within the same address.

Write Program

Memory Page

0100

1100

0000

000a

xxxx

Write Program memory Page

at address a:b.

Read EEPROM

Memory

1010

0000

000x

xxxx

xxbb

bbbb

oooo

Read data o from EEPROM

memory at address b.

Write EEPROM

Memory

1100

0000

000x

xxxx

xxbb

bbbb

iiii

Write data i to EEPROM

memory at address b.

MSB

LSB

SERIAL CLOCK INPUT

(SCK)

SERIAL DATA INPUT

(MOSI)

(MISO)

SAMPLE

SERIAL DATA OUTPUT

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