Rainbow-electronics ATmega161L Manual de usuario descargar pdf (Pagina 135)

135

ATmega161(L)

1228C–AVR–08/02

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 230 1.0t

CLCL

-20 ns

13 t

DVWL

Data Setup to WR Low 70 0.5t

CLCL

-55 ns

14 t

WHDX

Data Hold After WR High 125 0.5t

CLCL

-0 ns

15 t

DVWH

Data Valid to WR High 210 1.0t

CLCL

-40 ns

16 t

WLWH

WR Pulse Width 230 1.0t

CLCL

-20 ns

Table 55. 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 56. 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 4.0 MHz

10 t

RLDV

Read Low to Data Valid 335 2.0t

CLCL

-165 ns

12 t

RLRH

RD Pulse Width 480 2.0t

CLCL

-20 ns

15 t

DVWH

Data Valid to WR High 460 2.0t

CLCL

-40 ns

16 t

WLWH

WR Pulse Width 480 2.0t

CLCL

-20 ns

Table 57. 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 4.0 MHz

10 t

RLDV

Read Low to Data Valid 585 3.0t

CLCL

-165 ns

12 t

RLRH

RD Pulse Width 730 3.0t

CLCL

-20 ns

15 t

DVWH

Data Valid to WR High 710 3.0t

CLCL

-40 ns

16 t

WLWH

WR Pulse Width 730 3.0t

CLCL

-20 ns

Table 58. 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 4.0 MHz

10 t

RLDV

Read Low to Data Valid 585 3.0t

CLCL

-165 ns

12 t

RLRH

RD Pulse Width 730 3.0t

CLCL

-20 ns

14 t

WHDX

Data Hold After WR High 375 1.5t

CLCL

-0 ns

15 t

DVWH

Data Valid to WR High 710 3.0t

CLCL

-40 ns

16 t

WLWH

WR Pulse Width 730 3.0t

CLCL

-20 ns

1 2 ... 130 131 132 133 134 135 136 137 138 139 140 ... 158 159

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Rainbow-electronics ATmega161L Manual de usuario Pagina 135

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