Datasheet

Symbol Parameter 8MHz Oscillator Variable Oscillator Unit
Min Max Min Max
15 t
DVWH
Data Valid to WR High 240 2.0t
CLCL
ns
16 t
WLWH
WR Pulse Width 240 2.0t
CLCL
-10 ns
Table 32-13 External Data Memory Characteristics, 4.5V - 5.5V, SRWn1 = 1, SRWn0 = 0
Symbol Parameter 4MHz Oscillator Variable Oscillator Unit
Min Max Min Max
0 1/t
CLCL
Oscillator Frequency 0.0 16 MHz
10 t
RLDV
Read Low to Data Valid 325 3.0t
CLCL
-50 ns
12 t
RLRH
RD Pulse Width 365 3.0t
CLCL
-10 ns
15 t
DVWH
Data Valid to WR High 375 3.0t
CLCL
ns
16 t
WLWH
WR Pulse Width 365 3.0t
CLCL
-10 ns
Table 32-14 External Data Memory Characteristics, 4.5V - 5.5V, SRWn1 = 1, SRWn0 = 1
Symbol Parameter 4MHz Oscillator Variable Oscillator Unit
Min Max Min Max
0 1/t
CLCL
Oscillator Frequency 0.0 16 MHz
10 t
RLDV
Read Low to Data Valid 325 3.0t
CLCL
-50 ns
12 t
RLRH
RD Pulse Width 365 3.0t
CLCL
-10 ns
14 t
WHDX
Data Hold After WR High 240 2.0t
CLCL
-10 ns
15 t
DVWH
Data Valid to WR High 375 3.0t
CLCL
ns
16 t
WLWH
WR Pulse Width 365 3.0t
CLCL
-10 ns
Table 32-15 External Data Memory Characteristics, 2.7V - 5.5V, No Wait-state
Symbol Parameter 4MHz Oscillator Variable Oscillator Unit
Min Max Min Max
0 1/t
CLCL
Oscillator Frequency 0.0 8 MHz
1 t
LHLL
ALE Pulse Width 235 t
CLCL
-15 ns
2 t
AVLL
Address Valid A to ALE Low 115 0.5t
CLCL
-10
(1)
ns
3a t
LLAX_ST
Address Hold After ALE Low,
write access
5 5 ns
3b t
LLAX_LD
Address Hold after ALE Low,
read access
5 5 ns
4 t
AVLLC
Address Valid C to ALE Low 115 0.5t
CLCL
-10
(1)
ns
5 t
AVRL
Address Valid to RD Low 235 1.0t
CLCL
-15 ns
Atmel ATmega64A [DATASHEET]
Atmel-8160E-ATmega64A_Datasheet_Complete-09/2015
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