ATMEGA64-16AI datasheet(27/393 Pages) ATMEL

27 / 393 page

ATmega64(L)

2490L–AVR–10/06

External Memory

Interface

With all the features that 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).

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 on

page 2, Table 27 on page 73, Table 33 on page 77, and Table 45 on page 85). The

memory configuration is shown in Figure 11.

Figure 11. External Memory with Sector Select(1)

Note:

1. ATmega64 in non ATmega103 compatibility mode: Memory Configuration A is avail-

able (Memory Configuration B N/A).

ATmega64 in mega103 compatibility mode: Memory Configuration B is available

(Memory Configuration A N/A).

Memory Configuration A

0x0000

0x10FF

External Memory

(0-60K x 8)

0xFFFF

Internal Memory

SRL[2..0]

SRW11

SRW10

SRW01

SRW00

Lower Sector

Upper Sector

0x1100

Memory Configuration B

0x0000

External Memory

(0-60K x 8)

0xFFFF

Internal Memory

SRW10

0x0FFF

0x1000

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