ATMEGA64L-8MI View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
ATMEGA64L-8MI
Atmel Corporation
ATMEGA64L-8MI Datasheet PDF : 363 Pages
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ATmega64(L)
Table 140. External Data Memory Characteristics, 4.5 - 5.5 Volts, SRWn1 = 1, SRWn0 = 0
4 MHz Oscillator
Variable Oscillator
Symbol Parameter
Min
Max
Min
Max
0 1/tCLCL
10 tRLDV
12 tRLRH
15 tDVWH
16 tWLWH
Oscillator Frequency
Read Low to Data Valid
RD Pulse Width
Data Valid to WR High
WR Pulse Width
0.0
16
325
3.0tCLCL-50
365
3.0tCLCL-10
375
3.0tCLCL
365
3.0tCLCL-10
Unit
MHz
ns
ns
ns
ns
Table 141. External Data Memory Characteristics, 4.5 - 5.5 Volts, SRWn1 = 1, SRWn0 = 1
4 MHz Oscillator
Variable Oscillator
Symbol Parameter
Min
Max
Min
Max
0 1/tCLCL
Oscillator Frequency
0.0
16
10 tRLDV
Read Low to Data Valid
325
3.0tCLCL-50
12 tRLRH
RD Pulse Width
365
3.0tCLCL-10
14 tWHDX
Data Hold After WR High
240
2.0tCLCL-10
15 tDVWH
Data Valid to WR High
375
3.0tCLCL
16 tWLWH
WR Pulse Width
365
3.0tCLCL-10
Unit
MHz
ns
ns
ns
ns
ns
Table 142. External Data Memory Characteristics, 2.7 - 5.5 Volts, No Wait-state
4 MHz Oscillator
Symbol Parameter
Min
Max
0 1/tCLCL
Oscillator Frequency
1
tLHLL
ALE Pulse Width
235
2
tAVLL
Address Valid A to ALE Low
115
3a tLLAX_ST
Address Hold After ALE Low,
write access
5
3b tLLAX_LD
Address Hold after ALE Low,
read access
5
4
tAVLLC
Address Valid C to ALE Low
115
5
tAVRL
Address Valid to RD Low
235
6
tAVWL
Address Valid to WR Low
235
7
tLLWL
ALE Low to WR Low
115
130
8
tLLRL
ALE Low to RD Low
115
130
9
tDVRH
Data Setup to RD High
45
10 tRLDV
Read Low to Data Valid
190
11 tRHDX
Data Hold After RD High
0
12 tRLRH
RD Pulse Width
235
Variable Oscillator
Min
Max
0.0
8
tCLCL-15
0.5tCLCL-10(1)
5
5
0.5tCLCL-10(1)
1.0tCLCL-15
1.0tCLCL-15
0.5tCLCL-10(2)
0.5tCLCL-10(2)
45
0
1.0tCLCL-15
0.5tCLCL+5(2)
0.5tCLCL+5(2)
1.0tCLCL-60
Unit
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
2490G–AVR–03/04
337
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