Rainbow-electronics ATmega162V Manuel d'utilisateur télécharger pdf (Page 269)

269

ATmega162/V

2513E–AVR–09/03

External Data Memory Timing

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.

Table 115. External Data Memory Characteristics, 4.5 - 5.5 Volts, no Wait-state

Symbol Parameter

8 MHz Oscillator Variable Oscillator

UnitMin Max Min Max

01/t

CLCL

Oscillator Frequency 0.0 16 MHz

LHLL

ALE Pulse Width 115 1.0t

CLCL

-10 ns

AVLL

Address Valid A to ALE Low 57.5 0.5t

CLCL

-5

(1)

3a t

LLAX_ST

Address Hold After ALE Low,

write access

3b t

LLAX_LD

Address Hold after ALE Low,

read access

AVLLC

Address Valid C to ALE Low 57.5 0.5t

CLCL

-5

(1)

AVRL

Address Valid to RD Low 115 1.0t

CLCL

-10 ns

AVWL

Address Valid to WR Low 115 1.0t

CLCL

-10 ns

LLWL

ALE Low to WR Low 47.5 67.5 0.5t

CLCL

-15

(2)

0.5t

CLCL

(2)

LLRL

ALE Low to RD Low 47.5 67.5 0.5t

CLCL

-15

(2)

0.5t

CLCL

(2)

DVRH

Data Setup to RD High 40 40 ns

10 t

RLDV

Read Low to Data Valid 75 1.0t

CLCL

-50 ns

11 t

RHDX

Data Hold After RD High 0 0 ns

12 t

RLRH

RD Pulse Width 115 1.0t

CLCL

-10 ns

13 t

DVWL

Data Setup to WR Low 42.5 0.5t

CLCL

-20

(1)

14 t

WHDX

Data Hold After WR High 115 1.0t

CLCL

-10 ns

15 t

DVWH

Data Valid to WR High 125 1.0t

CLCL

16 t

WLWH

WR Pulse Width 115 1.0t

CLCL

-10 ns

Table 116. External Data Memory Characteristics, 4.5 - 5.5 Volts, 1 Cycle Wait-state

Symbol Parameter

8 MHz Oscillator Variable Oscillator

UnitMin Max Min Max

01/t

CLCL

Oscillator Frequency 0.0 16 MHz

10 t

RLDV

Read Low to Data Valid 200 2.0t

CLCL

-50 ns

12 t

RLRH

RD Pulse Width 240 2.0t

CLCL

-10 ns

15 t

DVWH

Data Valid to WR High 240 2.0t

CLCL

16 t

WLWH

WR Pulse Width 240 2.0t

CLCL

-10 ns

1 2 ... 264 265 266 267 268 269 270 271 272 273 274 ... 322 323

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Rainbow-electronics ATmega162V Manuel d'utilisateur Page 269

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