ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 29

• Manufacturer Part Number: ATMEGA2561V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

2549K–AVR–01/07
Figure 16. External Data Memory Cycles with SRWn1 = 0 and SRWn0 = 1
Note:
Figure 17. External Data Memory Cycles with SRWn1 = 1 and SRWn0 = 0
Note:
System Clock (CLK
System Clock (CLK
DA7:0 (XMBK = 0)
DA7:0 (XMBK = 1)
DA7:0 (XMBK = 0)
DA7:0 (XMBK = 1)
1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper
1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper
DA7:0
A15:8
CPU
ALE
WR
sector) or SRW00 (lower sector).
The ALE pulse in period T5 is only present if the next instruction accesses the RAM
(internal or external).
sector) or SRW00 (lower sector).
The ALE pulse in period T6 is only present if the next instruction accesses the RAM
(internal or external).
RD
DA7:0
A15:8
)
CPU
ALE
WR
RD
Prev. addr.
Prev. data
Prev. data
Prev. data
)
Prev. addr.
Prev. data
Prev. data
Prev. data
T1
ATmega640/1280/1281/2560/2561
T1
Address
Address
Address
T2
Address
Address
XX
Address
T2
XX
Address
T3
Data
Data
Data
Address
T3
Data
Data
Data
T4
T4
T5
T5
(1)
(1)
T6
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