ATMEga64L ATMEL Corporation, ATMEga64L Datasheet - Page 337

• Manufacturer Part Number: ATMEga64L
• Description: 8-bit AVR Microcontroller with 64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

Table 140. External Data Memory Characteristics, 4.5 - 5.5 Volts, SRWn1 = 1, SRWn0 = 0
Table 141. External Data Memory Characteristics, 4.5 - 5.5 Volts, SRWn1 = 1, SRWn0 = 1
Table 142. External Data Memory Characteristics, 2.7 - 5.5 Volts, No Wait-state
2490G–AVR–03/04
0
10
12
15
16
0
10
12
14
15
16
0
1
2
3a
3b
4
5
6
7
8
9
10
11
12
Symbol
1/t
t
t
t
t
Symbol
1/t
t
t
t
t
t
Symbol
1/t
t
t
t
t
t
t
t
t
t
t
t
t
t
RLDV
RLRH
DVWH
WLWH
RLDV
RLRH
WHDX
DVWH
WLWH
LHLL
AVLL
LLAX_ST
LLAX_LD
AVLLC
AVRL
AVWL
LLWL
LLRL
DVRH
RLDV
RHDX
RLRH
CLCL
CLCL
CLCL
Parameter
Oscillator Frequency
Read Low to Data Valid
RD Pulse Width
Data Valid to WR High
WR Pulse Width
Parameter
Oscillator Frequency
Read Low to Data Valid
RD Pulse Width
Data Hold After WR High
Data Valid to WR High
WR Pulse Width
Parameter
Oscillator Frequency
ALE Pulse Width
Address Valid A to ALE Low
Address Hold After ALE Low,
write access
Address Hold after ALE Low,
read access
Address Valid C to ALE Low
Address Valid to RD Low
Address Valid to WR Low
ALE Low to WR Low
ALE Low to RD Low
Data Setup to RD High
Read Low to Data Valid
Data Hold After RD High
RD Pulse Width
Min
365
375
365
Min
365
240
375
365
Min
235
115
115
235
235
115
115
235
45
0
5
5
4 MHz Oscillator
4 MHz Oscillator
4 MHz Oscillator
Max
Max
Max
325
325
130
130
190
0.5t
0.5t
0.5t
0.5t
3.0t
3.0t
3.0t
2.0t
3.0t
1.0t
1.0t
1.0t
3.0t
3.0t
t
CLCL
CLCL
CLCL
CLCL
CLCL
Min
Min
Min
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
0.0
0.0
0.0
45
5
5
0
Variable Oscillator
Variable Oscillator
Variable Oscillator
CLCL
CLCL
-15
-10
-10
-10
-10
-10
-10
-10
-10
-10
-15
-15
-15
(1)
(1)
(2)
(2)
ATmega64(L)
0.5t
0.5t
3.0t
3.0t
1.0t
CLCL
CLCL
Max
Max
Max
CLCL
CLCL
CLCL
16
16
8
+5
+5
-50
-50
-60
(2)
(2)
Unit
MHz
ns
ns
ns
ns
Unit
MHz
ns
ns
ns
ns
ns
Unit
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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