Rainbow-electronics ATmega8515L Manuel d'utilisateur télécharger pdf (Page 203)

203

ATmega8515(L)

2512A–AVR–04/02

Figure 91. ExternalMemory Timing (SRWn1 = 1,SRWn0 = 0)

Figure 92. ExternalMemory Timing (SRWn1 = 1,SRWn0 = 1)

(1)

Note: 1. TheALE pulseinthe last period(T4-T7) is only present if thenextinstruction

accesses theRAM(internal or external).

ALE

T1 T2 T3

Write

Read

A15:8

Address

Prev. Addr.

DA7:0

Address DataPrev. Data XX

DA7:0 (XMBK = 0)

Data

Address

System Clock (CLK

CPU

)

8 12

ALE

T1 T2 T3

Write

Read

A15:8

Address

Prev. Addr.

DA7:0

Address DataPrev. Data XX

DA7:0 (XMBK = 0)

Data

Address

System Clock (CLK

CPU

)

8 12

1 2 ... 198 199 200 201 202 203 204 205 206 207 208 ... 222 223

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Rainbow-electronics ATmega8515L Manuel d'utilisateur Page 203