Rainbow-electronics ATmega8515L Uživatelský manuál stáhnout pdf (Strana 200)

200

ATmega8515(L)

2512A–AVR–04/02

Table 101. ExternalData Memory Characteristics, 4.5 - 5.5 Volts, SRWn1 = 1,SRWn0 = 0

Symbol Parameter

4 MHz Oscillator Variable Oscillator

UnitMin Max Min Max

01/t

CLCL

OscillatorFrequency 0.0 16MHz

10 t

RLDV

ReadLow to Data Valid325 3.0t

CLCL

-50 ns

12 t

RLRH

RD Pulse Width365 3.0t

CLCL

-10 ns

15 t

DVWH

Data Valid to WR High375 3.0t

CLCL

16 t

WLWH

WRPulse Width365 3.0t

CLCL

-10 ns

Table 102. ExternalData Memory Characteristics, 4.5 - 5.5 Volts, SRWn1 = 1,SRWn0 = 1

Symbol Parameter

4 MHz Oscillator Variable Oscillator

UnitMin Max Min Max

01/t

CLCL

OscillatorFrequency 0.0 16MHz

10 t

RLDV

ReadLow to Data Valid325 3.0t

CLCL

-50 ns

12 t

RLRH

RD Pulse Width365 3.0t

CLCL

-10 ns

14 t

WHDX

Data Hold AfterWR High 240 2.0t

CLCL

-10 ns

15 t

DVWH

Data Valid to WR High375 3.0t

CLCL

16 t

WLWH

WRPulse Width365 3.0t

CLCL

-10 ns

Table 103. ExternalData Memory Characteristics, 2.7-5.5 Volts, No Wait-state

Symbol Parameter

4 MHz Oscillator Variable Oscillator

UnitMin Max Min Max

01/t

CLCL

OscillatorFrequency 0.0 8 MHz

LHLL

ALE Pulse Width 235t

CLCL

-15 ns

AVLL

Address Valid AtoALE Low 115 0.5t

CLCL

-10

(1)

3at

LLAX_ST

Address Hold After ALE Low,

write access

3b t

LLAX_LD

Address Hold after ALE Low,

read access

AVLLC

Address ValidCto ALE Low 115 0.5t

CLCL

-10

(1)

AVRL

Address Valid to RDLow 2351.0t

CLCL

-15 ns

6 t

AVWL

Address Valid to WR Low 2351.0t

CLCL

-15 ns

7 t

LLWL

ALE Low to WR Low 115 1300.5t

CLCL

-10

(2)

0.5t

CLCL

(2)

LLRL

ALE Low to RDLow 115 1300.5t

CLCL

-10

(2)

0.5t

CLCL

(2)

9 t

DVRH

Data Setup to RDHigh 45 45 ns

10 t

RLDV

ReadLow to Data Valid 1901.0t

CLCL

-60ns

11 t

RHDX

Data Hold After RDHigh 00ns

1 2 ... 195 196 197 198 199 200 201 202 203 204 205 ... 222 223

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