ATtiny45 datasheet(142/196 Pages) ATMEL

142 / 196 page

142

7598H–AVR–07/09

ATtiny25/45/85

21.6.2

Serial Programming Characteristics

Figure 21-3. Serial Programming Timing

Note:

1. 2 tCLCL for fck < 12 MHz, 3 tCLCL for fck >= 12 MHz

21.7

High-voltage Serial Programming

This section describes how to program and verify Flash Program memory, EEPROM Data mem-

ory, Lock bits and Fuse bits in the ATtiny25/45/85.

Table 21-11. Serial Programming Characteristics, T

A = -40°C to 125°C, VCC = 2.7 - 5.5V

(Unless Otherwise Noted)

Symbol

Parameter

Min

Typ

Max

Units

1/tCLCL

Oscillator Frequency (ATtiny25/45/85V)

MHz

tCLCL

Oscillator Period (ATtiny25/45/85V)

250

1/tCLCL

Oscillator Frequency (ATtiny25/45/85L, VCC = 2.7 -

5.5V)

010

MHz

tCLCL

Oscillator Period (ATtiny25/45/85L, VCC = 2.7 -

5.5V)

100

1/tCLCL

Oscillator Frequency (ATtiny25/45/85, V

CC = 4.5V -

5.5V)

020

MHz

tCLCL

Oscillator Period (ATtiny25/45/85, VCC = 4.5V - 5.5V)

tSHSL

SCK Pulse Width High

2 tCLCL*

tSLSH

SCK Pulse Width Low

2 tCLCL*

tOVSH

MOSI Setup to SCK High

tCLCL

tSHOX

MOSI Hold after SCK High

2 tCLCL

MOSI

MISO

SCK

OVSH

SHSL

SLSH

SHOX

SLIV

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