Rainbow-electronics ATmega128L Manuel d'utilisateur télécharger pdf (Page 319)

319

ATmega128(L)

2467B–09/01

Notes: 1. This assumes 50% clock duty cycle. The half period is actually the high time of the external clock, XTAL1.

2. This assumes 50% clock duty cycle. The half period is actually the low time of the external clock, XTAL1.

12 t

RLRH

RD Pulse Width TBD 1.0t

CLCL

-TBD ns

13 t

DVWL

Data Setup to WR Low TBD 0.5t

CLCL

-TBD ns

14 t

WHDX

Data Hold After WR High TBD 0.5t

CLCL

-TBD ns

15 t

DVWH

Data Valid to WR High TBD 1.0t

CLCL

-TBD ns

16 t

WLWH

WR Pulse Width TBD 1.0t

CLCL

-TBD ns

Table 142. External Data Memory Characteristics, 2.7 - 5.5 Volts, No Wait-state (Continued)

Symbol Parameter

4 MHz Oscillator Variable Oscillator

UnitMin Max Min Max

Table 143. External Data Memory Characteristics, 2.7 - 5.5 Volts, SRWn1 = 0, SRWn0 = 1

Symbol Parameter

4 MHz Oscillator Variable Oscillator

UnitMin Max Min Max

01/t

CLCL

Oscillator Frequency 0.0 TBD MHz

10 t

RLDV

Read Low to Data Valid TBD 2.0t

CLCL

-TBD ns

12 t

RLRH

RD Pulse Width TBD 2.0t

CLCL

-TBD ns

15 t

DVWH

Data Valid to WR High TBD 2.0t

CLCL

-TBD ns

16 t

WLWH

WR Pulse Width TBD 2.0t

CLCL

-TBD ns

Table 144. External Data Memory Characteristics, 2.7 - 5.5 Volts, SRWn1 = 1, SRWn0 = 0

Symbol Parameter

4 MHz Oscillator Variable Oscillator

UnitMin Max Min Max

01/t

CLCL

Oscillator Frequency 0.0 TBD MHz

10 t

RLDV

Read Low to Data Valid TBD 3.0t

CLCL

-TBD ns

12 t

RLRH

RD Pulse Width TBD 3.0t

CLCL

-TBD ns

15 t

DVWH

Data Valid to WR High TBD 3.0t

CLCL

-TBD ns

16 t

WLWH

WR Pulse Width TBD 3.0t

CLCL

-TBD ns

Table 145. External Data Memory Characteristics, 2.7 - 5.5 Volts, SRWn1 = 1, SRWn0 = 1

Symbol Parameter

4 MHz Oscillator Variable Oscillator

UnitMin Max Min Max

01/t

CLCL

Oscillator Frequency 0.0 TBD MHz

10 t

RLDV

Read Low to Data Valid TBD 3.0t

CLCL

-TBD ns

12 t

RLRH

RD Pulse Width TBD 3.0t

CLCL

-TBD ns

14 t

WHDX

Data Hold After WR High TBD 1.5t

CLCL

-TBD ns

15 t

DVWH

Data Valid to WR High TBD 3.0t

CLCL

-TBD ns

16 t

WLWH

WR Pulse Width TBD 3.0t

CLCL

-TBD ns

1 2 ... 314 315 316 317 318 319 320 321 322 323 324 ... 330 331

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Rainbow-electronics ATmega128L Manuel d'utilisateur Page 319

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