ATmega128
Figure 14. External Data Memory Cycles with SR W n1 = 0 and SR W n0 = 1 (1)
T1
T2
T3
T4
T5
System Clock (CLK CPU )
ALE
A15:8
Prev. addr.
Address
DA7:0
Prev. data
Address
XX
Data
W R
DA7:0 (XMBK = 0)
DA7:0 (XMBK = 1)
Prev. data
Prev. data
Address
Address
Data
Data
RD
Note:
1. SR W n1 = SR W 11 (upper sector) or SR W 01 (lower sector), SR W n0 = SR W 10 (upper sector) or
SR W 00 (lower sector).
The ALE pulse in period T5 is only present if the next instruction accesses the RAM (internal
or external).
Figure 15. External Data Memory Cycles with SR W n1 = 1 and SR W n0 = 0 (1)
T1
T2
T3
T4
T5
T6
System Clock (CLK CPU )
ALE
A15:8
Prev. addr.
Address
DA7:0
Prev. data
Address
XX
Data
W R
DA7:0 (XMBK = 0)
DA7:0 (XMBK = 1)
Prev. data
Prev. data
Address
Address
Data
Data
RD
Note:
1. SR W n1 = SR W 11 (upper sector) or SR W 01 (lower sector), SR W n0 = SR W 10 (upper sector) or
SR W 00 (lower sector).
The ALE pulse in period T6 is only present if the next instruction accesses the RAM (internal
or external).
29
2467X–AVR–06/11
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