Rainbow-electronics ATmega161L Manuel d'utilisateur télécharger pdf (Page 129)

129

ATmega161(L)

1228C–AVR–08/02

Serial Programming

Characteristics

Figure 81. Serial Programming Timing

Table 49. Serial Programming Characteristics, T

=-40°Cto85°C, V

=2.7-5.5V

(unless otherwise noted)

Symbol Parameter Min Typ Max Units

1/t

CLCL

Oscillator Frequency (V

=2.7-5.5V)0 4MHz

=4.0-5.5V)0 8MHz

CLCL

Oscillator Period (V

=2.7-5.5V) 250 ns

=4.0-5.5V) 125 ns

SHSL

SCK Pulse Width High 2 t

CLCL

SLSH

SCK Pulse Width Low 2 t

CLCL

OVSH

MOSI Setup to SCK High t

CLCL

SHOX

MOSI Hold after SCK High 2 t

CLCL

SLIV

SCK Low to MISO Valid 10 16 32 ns

MOSI

MISO

SCK

OVSH

SHSL

SLSH

SHOX

SLIV

1 2 ... 124 125 126 127 128 129 130 131 132 133 134 ... 158 159

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Rainbow-electronics ATmega161L Manuel d'utilisateur Page 129