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9. External Memory Interface
With all the features the External Memory Interface provides, it is well suited to operate as an interface to memory
devices such as External SRAM and Flash, and peripherals such as LCD-display, A/D, and D/A. The main features
are:
Four different wait-state settings (including no wait-state)
Independent wait-state setting for different External Memory sectors (configurable sector size)
The number of bits dedicated to address high byte is selectable
Bus keepers on data lines to minimize current consumption (optional)
9.1 Overview
When the eXternal MEMory (XMEM) is enabled, address space outside the internal SRAM becomes available
using the dedicated External Memory pins (see Figure 1-3 on page 4, Table 13-3 on page 75, Table 13-9 on page
79, and Table 13-21 on page 86). The memory configuration is shown in Figure 9-1.
Figure 9-1.
External Memory with Sector Select
Memory Configuration A
0x0000
Internal memory
Lower sector
SRW01
SRW00
0x21FF
0x2200
External Memory
(0 - 60K x 8)
Upper sector
SRL[2..0]
SRW11
SRW10
0xFFFF
9.1.1 Using the External Memory Interface
The interface consists of:
• AD7:0: Multiplexed low-order address bus and data bus
A15:8: High-order address bus (configurable number of bits)
• ALE: Address latch enable
• RD: Read strobe
WR: Write strobe
ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]
2549Q–AVR–02/2014
27
ATMEL Corporation
ATMEL Corporation


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