Datasheet

157
2586D–AVR–02/06
ATtiny25/45/85
23.6.3 Serial Programming Characteristics
Figure 23-3. Serial Programming Waveforms
Figure 23-4. Serial Programming Timing
Note: 1. 2 t
CLCL
for f
ck
< 12 MHz, 3 t
CLCL
for f
ck
>= 12 MHz
Table 23-11. Serial Programming Characteristics, T
A
= -40°C to 85°C, V
CC
= 1.8 - 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
t
SLIV
SCK Low to MISO Valid TBD TBD TBD ns
MSB
MSB
LSB
LSB
SERIAL CLOCK INPUT
(SCK)
SERIAL DATA INPUT
(MOSI)
(MISO)
SAMPLE
S
ERIAL DATA OUTPUT
M
OSI
M
ISO
SCK
t
OVSH
t
SHSL
t
SLSH
t
SHOX
t
SL
IV