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ATmega64A bảng dữ liệu(PDF) 337 Page - ATMEL Corporation

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Giải thích chi tiết về linh kiện  8-bit Microcontroller with 64K Bytes In-System Programmable Flash
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ATmega64A bảng dữ liệu(HTML) 337 Page - ATMEL Corporation

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337
8160C–AVR–07/09
ATmega64A
Notes:
1. Minimum for AVCC is 2.7V.
2. Maximum for AVCC is 5.5V.
28.9
External Data Memory Timing
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.
V
INT
Internal Voltage Reference
2.3
2.56
2.7
V
RREF
Reference Input Resistance
32
k
Ω
RAIN
Analog Input Resistance
100
M
Ω
Table 28-8.
External Data Memory Characteristics, 4.5 - 5.5 Volts, No Wait-state
Symbol
Parameter
8 MHz Oscillator
Variable Oscillator
Unit
Min
Max
Min
Max
01/tCLCL
Oscillator Frequency
0.0
16
MHz
1t
LHLL
ALE Pulse Width
115
1.0t
CLCL-10
ns
2tAVLL
Address Valid A to ALE Low
57.5
0.5tCLCL-5
(1)
ns
3a
t
LLAX_ST
Address Hold After ALE Low,
write access
55
ns
3b
tLLAX_LD
Address Hold after ALE Low,
read access
55
ns
4t
AVLLC
Address Valid C to ALE Low
57.5
0.5t
CLCL-5
(1)
ns
5tAVRL
Address Valid to RD Low
115
1.0tCLCL-10
ns
6t
AVWL
Address Valid to WR Low
115
1.0t
CLCL-10
ns
7t
LLWL
ALE Low to WR Low
47.5
67.5
0.5t
CLCL-15
(2)
0.5t
CLCL+5
(2)
ns
8tLLRL
ALE Low to RD Low
47.5
67.5
0.5tCLCL-15
(2)
0.5tCLCL+5
(2)
ns
9t
DVRH
Data Setup to RD High
40
40
ns
10
t
RLDV
Read Low to Data Valid
75
1.0t
CLCL-50
ns
11
tRHDX
Data Hold After RD High
0
0
ns
12
t
RLRH
RD Pulse Width
115
1.0t
CLCL-10
ns
13
t
DVWL
Data Setup to WR Low
42.5
0.5t
CLCL-20
(1)
ns
14
tWHDX
Data Hold After WR High
115
1.0tCLCL-10
ns
15
t
DVWH
Data Valid to WR High
125
1.0t
CLCL
ns
16
t
WLWH
WR Pulse Width
115
1.0t
CLCL-10
ns
Table 28-7.
ADC Characteristics, Differential Channels, -40
⋅C – 85⋅C (Continued)
Symbol
Parameter
Condition
Min
Typ
Max
Units



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