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ATmega64A bảng dữ liệu(PDF) 338 Page - ATMEL Corporation

tên linh kiện ATmega64A
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 64K Bytes In-System Programmable Flash
PDF  392 Pages
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ATmega64A bảng dữ liệu(HTML) 338 Page - ATMEL Corporation

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338
8160C–AVR–07/09
ATmega64A
Table 28-9.
External Data Memory Characteristics, 4.5 - 5.5 Volts, 1 Cycle Wait-state
Symbol
Parameter
8 MHz Oscillator
Variable Oscillator
Unit
Min
Max
Min
Max
01/tCLCL
Oscillator Frequency
0.0
16
MHz
10
t
RLDV
Read Low to Data Valid
200
2.0t
CLCL-50
ns
12
tRLRH
RD Pulse Width
240
2.0tCLCL-10
ns
15
tDVWH
Data Valid to WR High
240
2.0tCLCL
ns
16
t
WLWH
WR Pulse Width
240
2.0t
CLCL-10
ns
Table 28-10. External Data Memory Characteristics, 4.5 - 5.5 Volts, SRWn1 = 1, SRWn0 = 0
Symbol
Parameter
4 MHz Oscillator
Variable Oscillator
Unit
Min
Max
Min
Max
01/t
CLCL
Oscillator Frequency
0.0
16
MHz
10
tRLDV
Read Low to Data Valid
325
3.0tCLCL-50
ns
12
tRLRH
RD Pulse Width
365
3.0tCLCL-10
ns
15
t
DVWH
Data Valid to WR High
375
3.0t
CLCL
ns
16
tWLWH
WR Pulse Width
365
3.0tCLCL-10
ns
Table 28-11. External Data Memory Characteristics, 4.5 - 5.5 Volts, SRWn1 = 1, SRWn0 = 1
Symbol
Parameter
4 MHz Oscillator
Variable Oscillator
Unit
Min
Max
Min
Max
01/t
CLCL
Oscillator Frequency
0.0
16
MHz
10
t
RLDV
Read Low to Data Valid
325
3.0t
CLCL-50
ns
12
tRLRH
RD Pulse Width
365
3.0tCLCL-10
ns
14
t
WHDX
Data Hold After WR High
240
2.0t
CLCL-10
ns
15
t
DVWH
Data Valid to WR High
375
3.0t
CLCL
ns
16
tWLWH
WR Pulse Width
365
3.0tCLCL-10
ns
Table 28-12. External Data Memory Characteristics, 2.7 - 5.5 Volts, No Wait-state
Symbol
Parameter
4 MHz Oscillator
Variable Oscillator
Unit
Min
Max
Min
Max
01/t
CLCL
Oscillator Frequency
0.0
8
MHz
1t
LHLL
ALE Pulse Width
235
t
CLCL-15
ns
2tAVLL
Address Valid A to ALE Low
115
0.5tCLCL-10
(1)
ns
3a
tLLAX_ST
Address Hold After ALE Low,
write access
55
ns
3b
t
LLAX_LD
Address Hold after ALE Low,
read access
55
ns



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