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ATMEGA161-4PC Datasheet(PDF) 74 Page - ATMEL Corporation

Part # ATMEGA161-4PC
Description  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
Download  134 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA161-4PC Datasheet(HTML) 74 Page - ATMEL Corporation

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ATmega161(L)
74
Figure 50. External memory with page select
Figure 51. External Data Memory Cycles without Wait State (SRWn1 = 0 and SRWn0 =0)
Note:
SRWn1 = SRW11 (upper page) or SRW01 (lower page), SRWn0 = SRW10 (upper page) or SRW00 (lower page)
The ALE pulse in period T4 is only present if the next instruction accesses the RAM (internal or external). The Data and
Address will only change in T4 if ALE is present (the next instruction accesses the RAM).
$0000
Data Memory
$0460
External Memory
(0-63K x 8)
$FFFF
Internal memory
SRL[2..0]
SRW11
SRW10
SRW01
SRW00
Lower page
Upper page
System Clock Ø
ALE
WR
RD
Data / Address [7..0]
Data / Address [7..0]
Address [15..8]
Address
Address
Address
T1
T2
T3
XX
Data
Data
T4
XX
XX
XX
XX
Prev. addr.
XX
Prev. data
XX
Prev. data


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