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 

Figure 161. External Memory Timing (SRWn1 = 1, SRWn0 = 0)

T1

T2

T3

T4

T5

System Clock (CLKCPU)

1

ALE

4

7

A15:8 Prev. addr.

DA7:0 Prev. data

WR

2 3a 13

Address XX

6

Address

15

Data

16

DA7:0 (XMBK = 0)

3b

Address

5

10

8

9

Data

12

RD

T6

14

11

Figure 162. External Memory Timing (SRWn1 = 1, SRWn0 = 1)(1)

T1

T2

T3

T4

T5

System Clock (CLKCPU)

1

T6

T7

ALE

4

7

A15:8 Prev. addr.

2 3a 13

Address

15

DA7:0 Prev. data

Address XX

Data

6

16

14

WR

3b

9

11

DA7:0 (XMBK = 0)

Address

5

10

Data

8

12

RD

Note: 1. The ALE pulse in the last period (T4-T7) is only present if the next instruction

accesses the RAM (internal or external).

340 ATmega64(L)

2490G–AVR–03/04

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