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ATMEGA640 Datasheet(PDF) 369 Page - Microchip Technology

Part # ATMEGA640
Description  8-bit Microcontroller with 16/32/64KB In-System Programmable Flash
PDF  436 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ATMEGA640 Datasheet(HTML) 369 Page - Microchip Technology

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369
ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]
DS40002211A
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.
Table 31-15. External Data Memory Characteristics, 2.7 to 5.5 Volts, No Wait-state
Symbol
Parameter
4MHz Oscillator
Variable Oscillator
Unit
Min.
Max.
Min.
Max.
01/tCLCL
Oscillator Frequency
0.0
8
MHz
1tLHLL
ALE Pulse Width
235
tCLCL-15
ns
2tAVLL
Address Valid A to ALE Low
115
0.5tCLCL-10(1)
3a
tLLAX_ST
Address Hold After ALE Low,
write access
55
3b
tLLAX_LD
Address Hold after ALE Low,
read access
55
4tAVLLC
Address Valid C to ALE Low
115
0.5tCLCL-10(1)
5tAVRL
Address Valid to RD Low
235
1.0tCLCL-15
6tAVWL
Address Valid to WR Low
235
1.0tCLCL-15
7tLLWL
ALE Low to WR Low
115
130
0.5tCLCL-10(2)
0.5tCLCL+5(2)
8tLLRL
ALE Low to RD Low
115
130
0.5tCLCL-10(2)
0.5tCLCL+5(2)
9tDVRH
Data Setup to RD High
45
45
10
tRLDV
Read Low to Data Valid
190
1.0tCLCL-60
11
tRHDX
Data Hold After RD High
0
0
12
tRLRH
RD Pulse Width
235
1.0tCLCL-15
13
tDVWL
Data Setup to WR Low
105
0.5tCLCL-20(1)
14
tWHDX
Data Hold After WR High
235
1.0tCLCL-15
15
tDVWH
Data Valid to WR High
250
1.0tCLCL
16
tWLWH
WR Pulse Width
235
1.0tCLCL-15
Table 31-16. External Data Memory Characteristics, 2.7 to 5.5 Volts, SRWn1 = 0, SRWn0 = 1
Symbol
Parameter
4MHz Oscillator
Variable Oscillator
Unit
Min.
Max.
Min.
Max.
01/tCLCL
Oscillator Frequency
0.0
8
MHz
10
tRLDV
Read Low to Data Valid
440
2.0tCLCL-60
ns
12
tRLRH
RD Pulse Width
485
2.0tCLCL-15
15
tDVWH
Data Valid to WR High
500
2.0tCLCL
16
tWLWH
WR Pulse Width
485
2.0tCLCL-15



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