ATMEga64L ATMEL Corporation, ATMEga64L Datasheet - Page 28
ATMEga64L
Manufacturer Part Number
ATMEga64L
Description
8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.ATMEGA64L.pdf
(363 pages)
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ATmega64(L)
Figure 13. External Data Memory Cycles without Wait State
(SRWn1 = 0 and SRWn0 =0)
Note:
Figure 14. External Data Memory Cycles with SRWn1 = 0 and SRWn0 = 1
Note:
System Clock (CLK
System Clock (CLK
DA7:0 (XMBK = 0)
DA7:0 (XMBK = 1)
DA7:0 (XMBK = 0)
DA7:0 (XMBK = 1)
1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper
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).
sector) or SRW00 (lower sector).
The ALE pulse in period T5 is only present if the next instruction accesses the RAM
(internal or external).
DA7:0
A15:8
CPU
ALE
WR
DA7:0
RD
A15:8
CPU
ALE
)
WR
RD
)
Prev. Addr.
Prev. Data
Prev. Data
Prev. Data
Prev. Addr.
Prev. Data
Prev. Data
Prev. Data
T1
T1
Address
Address
Address
T2
Address
Address
XX
Address
T2
XX
Address
T3
Data
Data
Data
Address
T3
Data
Data
Data
(1)
T4
T4
T5
2490G–AVR–03/04
(1)
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