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ATMEGA640 датащи(PDF) 30 Page - Microchip Technology

номер детали ATMEGA640
подробное описание детали  8-bit Microcontroller with 16/32/64KB In-System Programmable Flash
PDF  436 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ATMEGA640 датащи(HTML) 30 Page - Microchip Technology

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]
DS40002211A
Figure 9-4.
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 sec-
tor).
The ALE pulse in period T5 is only present if the next instruction accesses the RAM (internal or external).
Figure 9-5.
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 sec-
tor).
The ALE pulse in period T6 is only present if the next instruction accesses the RAM (internal or external).
ALE
T1
T2
T3
WR
T5
A15:8
Address
Prev. addr.
DA7:0
Address
Data
Prev. data
XX
RD
DA7:0 (XMBK = 0)
Data
Prev. data
Address
Data
Prev. data
Address
DA7:0 (XMBK = 1)
System Clock (CLKCPU)
T4
ALE
T1
T2
T3
WR
T6
A15:8
Address
Prev. addr.
DA7:0
Address
Data
Prev. data
XX
RD
DA7:0 (XMBK = 0)
Data
Prev. data
Address
Data
Prev. data
Address
DA7:0 (XMBK = 1)
System Clock (CLKCPU)
T4
T5



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