ATMEGA64-16MI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA64-16MI

8-bit AVR® Microcontroller with 64K Bytes In-System Programmable Flash

Atmel Corporation 

ATmega64(L)

Figure 15. External Data Memory Cycles with SRWn1 = 1 and SRWn0 = 0(1)

T1

T2

T3

T4

T5

T6

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 T6 is only present if the next instruction accesses the RAM

(internal or external).

Figure 16. External Data Memory Cycles with SRWn1 = 1 and SRWn0 = 1(1)

T1

T2

T3

T4

T5

T6

T7

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 T7 is only present if the next instruction accesses the RAM

(internal or external).

29

2490G–AVR–03/04

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