Datasheet

170
ATtiny25/45/85 [DATASHEET]
2586Q–AVR–08/2013
21.8 Serial Programming Characteristics
Figure 21-4. Serial Programming Waveforms
Figure 21-5. Serial Programming Timing
Note: 1. 2 t
CLCL
for f
ck
< 12 MHz, 3 t
CLCL
for f
ck
>= 12 MHz
Table 21-11. 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 (V
CC
= 1.8 - 5.5V) 0 4 MHz
t
CLCL
Oscillator Period (V
CC
= 1.8 - 5.5V) 250 ns
1/t
CLCL
Oscillator Frequency (V
CC
= 2.7 - 5.5V) 0 10 MHz
t
CLCL
Oscillator Period (V
CC
= 2.7 - 5.5V) 100 ns
1/t
CLCL
Oscillator Frequency (V
CC
= 4.5V - 5.5V) 0 20 MHz
t
CLCL
Oscillator Period (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 100 ns
MSB
MSB
LSB
LSB
SERIAL CLOCK INPUT
(SCK)
SERIAL DATA INPUT
(MOSI)
(MISO)
SAMPLE
SERIAL DATA OUTPUT
MOSI
MISO
SCK
t
OVSH
t
SHSL
t
SLSH
t
SHOX
t
SLIV