Rainbow-electronics ATmega8515L Manual do Utilizador descarregar pdf (Página 26)

ATmega8515(L)

2512A–AVR–04/02

Figure 14. ExternalData Memory CycleswithSRWn1 = 0andSRWn0 = 1

(1)

Note: 1. SRWn1 =SRW11 (uppersector) orSRW01 (lowersector), SRWn0 =SRW10 (upper

sector) orSRW00 (lowersector)

TheALE pulseinperiod T5 is only present if thenextinstruction accesses theRAM

(internal or external).

Figure 15. ExternalData Memory CycleswithSRWn1 = 1andSRWn0 = 0

(1)

Note: 1. SRWn1 =SRW11 (uppersector) orSRW01 (lowersector), SRWn0 =SRW10 (upper

sector) orSRW00 (lowersector)

TheALE pulseinperiod T6 is only present if thenextinstruction accesses theRAM

(internal or external).

ALE

T1 T2 T3

Write

Read

A15:8

AddressPrev. Addr.

DA7:0

Address DataPrev. Data XX

DA7:0 (XMBK = 0)

DataPrev. Data Address

DA7:0 (XMBK = 1)

System Clock (CLK

CPU

)

ALE

T1 T2 T3

Write

Read

A15:8

AddressPrev. Addr.

DA7:0

Address DataPrev. Data XX

DA7:0 (XMBK = 0)

DataPrev. Data Address

DA7:0 (XMBK = 1)

System Clock (CLK

CPU

)

T4 T5

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 222 223

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