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ATMEGA8515 Datasheet(PDF) 29 Page - ATMEL Corporation |
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ATMEGA8515 Datasheet(HTML) 29 Page - ATMEL Corporation |
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29 / 257 page  29 ATmega8515(L) 2512K–AVR–01/10 Figure 16. External Data Memory Cycles with SRWn1 = 1 and SRWn0 = 1 (1) Note: 1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper sector) or SRW00 (lower sector) The ALE pulse in period T7 is only present if the next instruction accesses the RAM (internal or external). XMEM Register Description MCU Control Register – MCUCR • Bit 7 – SRE: External SRAM/XMEM Enable Writing SRE to one enables the External Memory Interface.The pin functions AD7:0, A15:8, ALE, WR, and RD are activated as the alternate pin functions. The SRE bit over- rides any pin direction settings in the respective Data Direction Registers. Writing SRE to zero, disables the External Memory Interface and the normal pin and data direction settings are used. • Bit 6 – SRW10: Wait State Select Bit For a detailed description, see common description for the SRWn bits below (EMCUCR description). Extended MCU Control Register – EMCUCR • Bit 6..4 – SRL2, SRL1, SRL0: Wait State Sector Limit It is possible to configure different wait states for different external memory addresses. The External Memory address space can be divided in two sectors that have separate wait state bits. The SRL2, SRL1, and SRL0 bits select the splitting of these sectors, see Table 2 and Figure 11. By default, the SRL2, SRL1, and SRL0 bits are set to zero and the entire External Memory address space is treated as one sector. When the entire ALE T1 T2 T3 WR T7 A15:8 Address Prev. Addr. DA7:0 Address Data Prev. Data XX RD DA7:0 (XMBK = 0) Data Prev. Data Address Data Prev. Data Address DA7:0 (XMBK = 1) System Clock (CLKCPU) T4 T5 T6 Bit 7654 321 0 SRE SRW10 SE SM1 ISC11 ISC10 ISC01 ISC00 MCUCR Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0000 000 0 Bit 7654 321 0 SM0 SRL2 SRL1 SRL0 SRW01 SRW00 SRW11 ISC2 EMCUCR Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0000 000 0 |
Similar Part No. - ATMEGA8515_10 |
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Similar Description - ATMEGA8515_10 |
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