Rainbow-electronics ATmega8HVD Manuel d'utilisateur télécharger pdf (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

LSB

SERIAL CLOCK INPUT

(SCK)

SERIAL DATA INPUT

(MOSI)

(MISO)

SAMPLE

SERIAL DATA OUTPUT

MOSI

MISO

SCK

OVSH

SHSL

SLSH

SHOX

SLIV

Table 26-8. Serial Programming Characteristics, T

= -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

= 2.2V) 0 4 MHz

CLCL

Oscillator Period (ATmega4HVD/8HVD, V

= 2.2V) 50 ns

SHSL

SCK Pulse Width High 3 t

CLCL

* ns

SLSH

SCK Pulse Width Low 3 t

CLCL

* ns

OVSH

MOSI Setup to SCK High t

CLCL

SHOX

MOSI Hold after SCK High 2 t

CLCL

SLIV

SCK Low to MISO Valid TBD TBD TBD ns

1 2 ... 143 144 145 146 147 148 149 150 151 152 153 ... 167 168

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