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ATMEGA1280 데이터시트(HTML) 34 Page - ATMEL Corporation

부품명 ATMEGA1280
상세내용  8- BIT Microcontroller with 256K Bytes In-System Programmable Flash
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제조사  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
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ATMEGA1280 데이터시트(HTML) 34 Page - ATMEL Corporation

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ATmega640/1280/1281/2560/2561
2549A–AVR–03/05
• 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 5.
• 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 5.
Note:
1. n = 0 or 1 (lower/upper sector).
For further details of the timing and wait-states of the External Memory Interface, see
Figures 16 through Figures 19 for how the setting of the SRW bits affects the timing.
Table 4. Sector limits with different settings of SRL2..0
SRL2
SRL1
SRL0
Sector Limits
00
x
Lower sector = N/A
Upper sector = 0x2200 - 0xFFFF
01
0
Lower sector = 0x2200 - 0x3FFF
Upper sector = 0x4000 - 0xFFFF
01
1
Lower sector = 0x2200 - 0x5FFF
Upper sector = 0x6000 - 0xFFFF
10
0
Lower sector = 0x2200 - 0x7FFF
Upper sector = 0x8000 - 0xFFFF
10
1
Lower sector = 0x2200 - 0x9FFF
Upper sector = 0xA000 - 0xFFFF
11
0
Lower sector = 0x2200 - 0xBFFF
Upper sector = 0xC000 - 0xFFFF
11
1
Lower sector = 0x2200 - 0xDFFF
Upper sector = 0xE000 - 0xFFFF
Table 5. Wait States(1)
SRWn1
SRWn0
Wait States
0
0
No wait-states
0
1
Wait one cycle during read/write strobe
1
0
Wait two cycles during read/write strobe
1
1
Wait two cycles during read/write and wait one cycle before driving out
new address


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