ATMEGA8515_10 datasheet(25/257 Pages) ATMEL

Part #	ATMEGA8515

Description	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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25

ATmega8515(L)

2512K–AVR–01/10

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)

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 26 on page 66, Table 32 on page 70, and Table 38 on page 74). The

memory configuration is shown in Figure 11.

Figure 11. External Memory with Sector Select

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

0x0000

0x25F

External Memory

(0-64K x 8)

0xFFFF

Internal Memory

SRL[2..0]

SRW11

SRW10

SRW01

SRW00

Lower Sector

Upper Sector

0x260

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ATMEGA8515 Datasheet(PDF) 25 Page - ATMEL Corporation

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