Rainbow-electronics ATmega161L Manuel d'utilisateur télécharger pdf (Page 136)

136

ATmega161(L)

1228C–AVR–08/02

Figure 83. External Memory Timing (SRWn1 = 0, SRWn0 = 0)

Figure 84. External Memory Timing (SRWn1 = 0, SRWn0 = 1)

ALE

WR

RD

Address [15..8]

AddressXX

XX

Read

Data/Address [7..0]

Address

Data

XX

Write

Data/Address [7..0]

Address Data

XX

System Clock Ø

T1 T2 T3

T4

1

4

2

7

6

3a

3b

5

8

12

16

13

15

9

10

11

14

Prev. addr.

XX

Prev. data

XX

Prev. data

ALE

WR

RD

Address [15..8]

AddressXX

XX

Read

Data/Address [7..0]

Address

Data

XX

Write

Data/Address [7..0]

Address Data

XX

T1 T2 T3 T5

1

4

2

7

6

3a

3b

5

8

12

16

13

15

9

10

11

14

Prev. addr.

XX

Prev. data

XX

Prev. data

System Clock Ø

T4

1 2 ... 131 132 133 134 135 136 137 138 139 140 141 ... 158 159

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