Rainbow-electronics ATmega8515L Manual de usuario descargar pdf (Pagina 201)

201

ATmega8515(L)

2512A–AVR–04/02

Notes: 1. This assumes 50%clock duty cycle. The half period is actually the high time of theexternalclock, XTA L1.

2. This assumes 50%clock duty cycle. The half period is actually the low time of theexternalclock, XTA L1.

12 t

RLRH

RD Pulse Width 2351.0t

CLCL

-15 ns

13 t

DVWL

Data Setup to WR Low 105 0.5t

CLCL

-20

(1)

14 t

WHDX

Data Hold AfterWR High 2351.0t

CLCL

-15 ns

15 t

DVWH

Data Valid to WR High 250 1.0t

CLCL

16 t

WLWH

WRPulse Width 2351.0t

CLCL

-15 ns

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

Symbol Parameter

4 MHz Oscillator Variable Oscillator

UnitMin Max Min Max

Table 104. ExternalData 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

OscillatorFrequency 0.0 8 MHz

10 t

RLDV

ReadLow to Data Valid 440 2.0t

CLCL

-60ns

12 t

RLRH

RD Pulse Width 485 2.0t

CLCL

-15 ns

15 t

DVWH

Data Valid to WR High 500 2.0t

CLCL

16 t

WLWH

WRPulse Width 485 2.0t

CLCL

-15 ns

Table 105. ExternalData 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

OscillatorFrequency 0.0 8 MHz

10 t

RLDV

ReadLow to Data Valid690 3.0t

CLCL

-60ns

12 t

RLRH

RD Pulse Width735 3.0t

CLCL

-15 ns

15 t

DVWH

Data Valid to WR High750 3.0t

CLCL

16 t

WLWH

WRPulse Width735 3.0t

CLCL

-15 ns

Table 106. ExternalData 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

OscillatorFrequency 0.0 8 MHz

10 t

RLDV

ReadLow to Data Valid690 3.0t

CLCL

-60ns

12 t

RLRH

RD Pulse Width735 3.0t

CLCL

-15 ns

14 t

WHDX

Data Hold AfterWR High 485 2.0t

CLCL

-15 ns

15 t

DVWH

Data Valid to WR High750 3.0t

CLCL

16 t

WLWH

WRPulse Width735 3.0t

CLCL

-15 ns

1 2 ... 196 197 198 199 200 201 202 203 204 205 206 ... 222 223

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