Rainbow Electronics ATmega8HVD - Manual (Page 148)

148
8052B–AVR–09/08
ATmega4HVD/8HVD
26.6 Programming Characteristics
26.6.1 Serial Programming
Figure 26-1. Serial Programming Waveforms
Figure 26-2. Serial Programming Timing
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
Table 26-8. Serial Programming Characteristics, T
A
= -40
°
C to 85
°
C, VFET = 2.1 - 6.0V (Unless Otherwise Noted)
Symbol Parameter Min Typ Max Units
1/t
CLCL
Oscillator Frequency (ATmega4HVD/8HVD, V
CC
= 2.2V) 0 4 MHz
t
CLCL
Oscillator Period (ATmega4HVD/8HVD, V
CC
= 2.2V) 50 ns
t
SHSL
SCK Pulse Width High 3 t
CLCL
* ns
t
SLSH
SCK Pulse Width Low 3 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