ATMEGA64L-8MI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA64L-8MI

8-bit AVR® Microcontroller with 64K Bytes In-System Programmable Flash

Atmel Corporation 

External Memory

Interface

Overview

ATmega64(L)

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).

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 71, Table 33 on page 75, and Table 45 on page 83). The

memory configuration is shown in Figure 11.

Figure 11. External Memory with Sector Select(1)

Memory Configuration A

0x0000

Memory Configuration B

0x0000

Internal Memory

Lower Sector

SRW01

SRW00

0x10FF

0x1100

Internal Memory

0x0FFF

0x1000

External Memory

(0-60K x 8)

Upper Sector

SRL[2..0]

External Memory

(0-60K x 8)

SRW10

SRW11

SRW10

0xFFFF

0xFFFF

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).

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2490G–AVR–03/04

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