Atmel ATtiny25

142
7598H–AVR–07/09
ATtiny25/45/85
21.6.2 Serial Programming Characteristics
Figure 21-3. Serial Programming Timing
Note: 1. 2 t
CLCL
for f
ck
< 12 MHz, 3 t
CLCL
for f
ck
>= 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, V
CC
= 2.7 - 5.5V
(Unless Otherwise Noted)
Symbol Parameter Min Typ Max Units
1/t
CLCL
Oscillator Frequency (ATtiny25/45/85V) 0 4 MHz
t
CLCL
Oscillator Period (ATtiny25/45/85V) 250 ns
1/t
CLCL
Oscillator Frequency (ATtiny25/45/85L, VCC = 2.7 -
5.5V)
010MHz
t
CLCL
Oscillator Period (ATtiny25/45/85L, VCC = 2.7 -
5.5V)
100 ns
1/t
CLCL
Oscillator Frequency (ATtiny25/45/85, V
CC
= 4.5V -
5.5V)
020MHz
t
CLCL
Oscillator Period (ATtiny25/45/85, V
CC
= 4.5V - 5.5V) 50 ns
t
SHSL
SCK Pulse Width High 2 t
CLCL*
ns
t
SLSH
SCK Pulse Width Low 2 t
CLCL
*
ns
t
OVSH
MOSI Setup to SCK High t
CLCL
ns
t
SHOX
MOSI Hold after SCK High 2 t
CLCL
ns
MOSI
MISO
SCK
t
OVSH
t
SHSL
t
SLSH
t
SHOX
t
SLIV