ATMEGA8515-16JU(2010) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

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ATMEGA8515-16JU
(Rev.:2010)

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

Atmel Corporation 

External Memory

Interface

Overview

ATmega8515(L)

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)

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

0x0000

Internal Memory

External Memory

(0-64K x 8)

Lower Sector

SRW01

SRW00

0x25F

0x260

Upper Sector

SRL[2..0]

SRW11

SRW10

0xFFFF

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

25

2512K–AVR–01/10

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