ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 386

• Manufacturer Part Number: ATMEGA2561V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Table 175. External Data Memory Characteristics, 4.5 - 5.5 Volts, SRWn1 = 1, SRWn0 = 0
Table 176. External Data Memory Characteristics, 4.5 - 5.5 Volts, SRWn1 = 1, SRWn0 = 1
Table 177. External Data Memory Characteristics, 2.7 - 5.5 Volts, No Wait-state
386
0
10
12
15
16
0
10
12
14
15
16
0
1
2
3a
3b
4
5
6
7
8
9
10
11
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
RLDV
RLRH
DVWH
WLWH
RLDV
RLRH
WHDX
DVWH
WLWH
LHLL
AVLL
LLAX_ST
LLAX_LD
AVLLC
AVRL
AVWL
LLWL
LLRL
DVRH
RLDV
RHDX
CLCL
CLCL
CLCL
ATmega640/1280/1281/2560/2561
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
Min
365
375
365
Min
365
240
375
365
Min
235
115
115
235
235
115
115
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
3.0t
3.0t
t
CLCL
CLCL
CLCL
CLCL
CLCL
Min
Min
Min
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
(1)
(1)
(2)
(2)
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
2549K–AVR–01/07
(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