Rainbow-electronics Atmega169L Instrukcja Użytkownika Pobierz pdf (Strona 298)

298

ATmega169V/L

2514A–AVR–08/02

External Clock Drive

Waveforms

Figure 135. External Clock Drive Waveforms

External Clock Drive

SPI Timing

Characteristics

See Figure 136 and Figure 137 for details.

V

IL1

V

IH1

Table 133. External Clock Drive

Symbol Parameter

V

CC

=1.8-3.6V V

CC

=2.7-3.6V

UnitsMin. Max. Min. Max.

1/t

CLCL

Oscillator Frequency 0 TBD 0 TBD MHz

t

CLCL

Clock Period TBD TBD ns

t

CHCX

High Time TBD TBD ns

t

CLCX

Low Time TBD TBD ns

t

CLCH

Rise Time TBD TBD µs

t

CHCL

Fall Time TBD TBD µs

∆t

CLCL

Change in period from one clock

cycle to the next

22%

Table 134. SPI Timing Parameters

Description Mode Min Typ Max

1 SCK period Master See Table 69

ns

2 SCK high/low Master 50% duty cycle

3 Rise/Fall time Master TBD

4 Setup Master TBD

5HoldMaster TBD

6 Out to SCK Master TBD

7 SCK to out Master TBD

8 SCK to out high Master TBD

9 SS low to out Slave TBD

10 SCK period Slave 4 • t

ck

TBD

11 SCK high/low Slave 2 • t

ck

TBD

12 Rise/Fall time Slave TBD

13 Setup Slave TBD

14 Hold Slave TBD

15 SCK to out Slave TBD

16 SCK to SS

high Slave TBD

17 SS high to tri-state Slave TBD

1 2 ... 293 294 295 296 297 298 299 300 301 302 303 ... 316 317

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