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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External Data Memory Timing
Table 138. External Data Memory Characteristics, 4.5 - 5.5 Volts, No Wait-state
8 MHz Oscillator
Variable Oscillator
Symbol Parameter
Min
Max
Min
Max
0
1/tCLCL
Oscillator Frequency
0.0
16
1
tLHLL
2
tAVLL
ALE Pulse Width
Address Valid A to ALE Low
115
57.5
1.0tCLCL-10
0.5tCLCL-5(1)
3a tLLAX_ST
Address Hold After ALE Low,
write access
5
5
3b tLLAX_LD
4
tAVLLC
Address Hold after ALE Low,
read access
Address Valid C to ALE Low
5
57.5
5
0.5tCLCL-5(1)
5
tAVRL
Address Valid to RD Low
115
1.0tCLCL-10
6
tAVWL
7
tLLWL
8
tLLRL
Address Valid to WR Low
ALE Low to WR Low
ALE Low to RD Low
115
47.5
47.5
67.5
67.5
1.0tCLCL-10
0.5tCLCL-15(2)
0.5tCLCL-15(2)
0.5tCLCL+5(2)
0.5tCLCL+5(2)
9
tDVRH
Data Setup to RD High
40
40
10 tRLDV
Read Low to Data Valid
75
1.0tCLCL-50
11 tRHDX
Data Hold After RD High
0
0
12 tRLRH
13 tDVWL
RD Pulse Width
Data Setup to WR Low
115
42.5
1.0tCLCL-10
0.5tCLCL-20(1)
14 tWHDX
Data Hold After WR High
115
1.0tCLCL-10
15 tDVWH
Data Valid to WR High
125
1.0tCLCL
16 tWLWH
WR Pulse Width
115
1.0tCLCL-10
Notes: 1. This assumes 50% clock duty cycle. The half period is actually the high time of the external clock, XTAL1.
2. This assumes 50% clock duty cycle. The half period is actually the low time of the external clock, XTAL1.
Unit
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Table 139. External Data Memory Characteristics, 4.5 - 5.5 Volts, 1 Cycle Wait-state
8 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
200
2.0tCLCL-50
240
2.0tCLCL-10
240
2.0tCLCL
240
2.0tCLCL-10
Unit
MHz
ns
ns
ns
ns
336 ATmega64(L)
2490G–AVR–03/04
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