
167
8048C–AVR–02/12
ATtiny43U
20.10 Serial Programming Characteristics
Figure 20-8. Serial Programming Timing
Figure 20-9. Serial Programming Waveforms
Table 20-10. Serial Programming Characteristics, T
A = -40°C to +85°C, VCC = 1.8 - 5.5V (Unless Otherwise Noted)
Symbol
Parameter
Min
Typ
Max
Units
1/t
CLCL
Oscillator Frequency
0
4
MHz
tCLCL
Oscillator Period
250
ns
1/t
CLCL
Oscillator Frequency (V
CC = 4.5 - 5.5V)
0
8
MHz
t
CLCL
Oscillator Period (V
CC = 4.5 - 5.5V)
125
ns
tSHSL
SCK Pulse Width High
2 tCLCL
ns
t
SLSH
SCK Pulse Width Low
2 t
CLCL
ns
t
OVSH
MOSI Setup to SCK High
t
CLCL
ns
tSHOX
MOSI Hold after SCK High
2 tCLCL
ns
t
SLIV
SCK Low to MISO Valid
100
ns
MOSI
MISO
SCK
t
OVSH
t
SHSL
t
SLSH
t
SHOX
t
SLIV
MSB
LSB
SERIAL CLOCK INPUT
(SCK)
SERIAL DATA INPUT
(MOSI)
(MISO)
SAMPLE
SERIAL DATA OUTPUT