AT90USB646 datasheet(33/435 Pages) ATMEL

Part #	AT90USB646

Description	8-bit Microcontroller with 64/128K Bytes of ISP Flash and USB Controller

PDF	435 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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33 / 435 page

7593D–AVR–07/06

AT90USB64/128

Figure 5-7.

External Data Memory Cycles with SRWn1 = 0 and SRWn0 = 1

(1)

Note:

1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper sector) or

SRW00 (lower sector).

The ALE pulse in period T5 is only present if the next instruction accesses the RAM (internal

or external).

Figure 5-8.

External Data Memory Cycles with SRWn1 = 1 and SRWn0 = 0(1)

Note:

1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper sector) or

SRW00 (lower sector).

The ALE pulse in period T6 is only present if the next instruction accesses the RAM (internal

or external).

ALE

A15:8

Address

Prev. addr.

DA7:0

Address

Data

Prev. data

DA7:0 (XMBK = 0)

Data

Prev. data

Address

Data

Prev. data

Address

DA7:0 (XMBK = 1)

System Clock (CLKCPU)

ALE

A15:8

Address

Prev. addr.

DA7:0

Address

Data

Prev. data

DA7:0 (XMBK = 0)

Data

Prev. data

Address

Data

Prev. data

Address

DA7:0 (XMBK = 1)

System Clock (CLKCPU)

AT90USB646 Datasheet(PDF) 33 Page - ATMEL Corporation

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