High-Voltage Serial Programming - Atmel ATtiny25 Manual

21.6.2 Serial Programming Characteristics
21.7

High-voltage Serial Programming

ATtiny25/45/85
142
Figure 21-3. Serial Programming Timing
MOSI
SCK
MISO
Table 21-11. Serial Programming Characteristics, T
(Unless Otherwise Noted)
Symbol Parameter
1/t Oscillator Frequency (ATtiny25/45/85V)
CLCL
t Oscillator Period (ATtiny25/45/85V)
CLCL
Oscillator Frequency (ATtiny25/45/85L, VCC = 2.7 -
1/t
CLCL
5.5V)
Oscillator Period (ATtiny25/45/85L, VCC = 2.7 -
t
CLCL
5.5V)
Oscillator Frequency (ATtiny25/45/85, V
1/t
CLCL
5.5V)
t Oscillator Period (ATtiny25/45/85, V
CLCL
t SCK Pulse Width High
SHSL
t SCK Pulse Width Low
SLSH
t MOSI Setup to SCK High
OVSH
t MOSI Hold after SCK High
SHOX
Note: 1. 2 t for f < 12 MHz, 3 t
CLCL ck
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.
t
OVSH
t
SHSL
A
= 4.5V -
CC
= 4.5V - 5.5V)
CC
for f >= 12 MHz
CLCL ck
t
t
SLSH
SHOX
t
SLIV
= -40°C to 125°C, V
CC
Min Typ
0
250
0
100
0
50
2 t
CLCL*
2 t
CLCL *
t
CLCL
2 t
CLCL
= 2.7 - 5.5V
Max Units
4 MHz
ns
10 MHz
ns
20 MHz
ns
ns
ns
ns
ns
7598H–AVR–07/09