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ATmega128-16AU Datasheet(PDF) 30 Page - ATMEL Corporation

Part # ATmega128-16AU
Description  8-bit Microcontroller with 128K Bytes In-System Programmable Flash
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega128-16AU Datasheet(HTML) 30 Page - ATMEL Corporation

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2467S–AVR–07/09
ATmega128
Figure 14. 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 15. 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
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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