ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 35

• 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
address space is configured as one sector, the wait-states are configured by the
SRW11 and SRW10 bits.
Table 7. Sector limits with different settings of SRL2:0
• Bit 3:2 – SRW11, SRW10: Wait-state Select Bits for Upper Sector
The SRW11 and SRW10 bits control the number of wait-states for the upper sector of
the external memory address space, see Table 8.
• Bit 1:0 – SRW01, SRW00: Wait-state Select Bits for Lower Sector
The SRW01 and SRW00 bits control the number of wait-states for the lower sector of
the external memory address space, see Table 8.
Table 8. Wait States
Note:
SRWn1
SRL2
0
0
1
1
0
0
0
1
1
1
1
1. n = 0 or 1 (lower/upper sector).
For further details of the timing and wait-states of the External Memory Interface, see
Figures 15 through Figures 18 for how the setting of the SRW bits affects the timing.
SRWn0
0
1
0
1
SRL1
0
1
1
0
0
1
1
(1)
Wait States
No wait-states
Wait one cycle during read/write strobe
Wait two cycles during read/write strobe
Wait two cycles during read/write and wait one cycle before driving out
new address
ATmega640/1280/1281/2560/2561
SRL0
0
1
0
1
0
1
x
Sector Limits
Lower sector = N/A
Upper sector = 0x2200 - 0xFFFF
Lower sector = 0x2200 - 0x3FFF
Upper sector = 0x4000 - 0xFFFF
Lower sector = 0x2200 - 0x5FFF
Upper sector = 0x6000 - 0xFFFF
Lower sector = 0x2200 - 0x7FFF
Upper sector = 0x8000 - 0xFFFF
Lower sector = 0x2200 - 0x9FFF
Upper sector = 0xA000 - 0xFFFF
Lower sector = 0x2200 - 0xBFFF
Upper sector = 0xC000 - 0xFFFF
Lower sector = 0x2200 - 0xDFFF
Upper sector = 0xE000 - 0xFFFF
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