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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATMEGA640 датащи(PDF) 37 Page - Microchip Technology |
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ATMEGA640 датащи(HTML) 37 Page - Microchip Technology |
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37 / 436 page  37 ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET] DS40002211A • 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 9-3. • 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 9-3. Note: 1. n = 0 or 1 (lower/upper sector). For further details of the timing and wait-states of the External Memory Interface, see Figure 9-3 on page 29 through Figure 9-6 on page 31 for how the setting of the SRW bits affects the timing. Table 9-2. 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 9-3. 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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