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 13. External Data Memory Cycles without Wait State(1)

(SRWn1 = 0 and SRWn0 =0)

T1

T2

T3

T4

System Clock (CLKCPU)

ALE

A15:8 Prev. Addr.

Address

DA7:0 Prev. Data

Address XX

Data

WR

DA7:0 (XMBK = 0) Prev. Data

Address

Data

DA7:0 (XMBK = 1) Prev. Data

Address

Data

RD

Note:

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

sector) or SRW00 (lower sector).

The ALE pulse in period T4 is only present if the next instruction accesses the RAM

(internal or external).

Figure 14. External Data Memory Cycles with SRWn1 = 0 and SRWn0 = 1(1)

T1

T2

T3

T4

T5

System Clock (CLKCPU)

ALE

A15:8 Prev. Addr.

Address

DA7:0 Prev. Data

Address XX

Data

WR

DA7:0 (XMBK = 0) Prev. Data

Address

Data

DA7:0 (XMBK = 1) Prev. Data

Address

Data

RD

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).

28 ATmega64(L)

2490G–AVR–03/04

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