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Giải thích chi tiết về linh kiện  16-BIT MCU WITH MAC UNIT, 128K to 256K BYTE FLASH MEMORY AND 12K BYTE RAM
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VDD = 5V ± 10%, VSS = 0V, TA = -40 to +125 °C (TQFP144 devices)
1. Theoretical minimum. The real minimum value depends on the duty cycle of the input clock signal. 32MHz is the maximum input frequency
when using an external crystal oscillator. However, 32MHz can be applied with an external clock source.
2. The input clock signal must reach the defined levels VIL and VIH2.
Figure 70 : External Clock Drive XTAL1
21.4.9 - Memory Cycle Variables
The tables below use three variables which are derived from the BUSCONx registers and represent the
special characteristics of the programmed memory cycle. The following table describes, how these
variables are to be computed.
Parameter
Symbol
fCPU = fXTAL
fCPU = fXTAL / 2
fCPU = fXTAL x F
F = 1.5/2,/2.5/3/4/5
Unit
Minimum
Maximum
Minimum
Maximum
Minimum
Maximum
Oscillator period
tOSC SR
31.251
–
15.625
–
31.25 x N
–
ns
High time
t1
SR
12.52
–6.252
–
12.52
–
ns
Low time
t2
SR
12.52
–6.252
–
12.52
–
ns
Rise time
t3
SR
–
3.1252
–1.562
–3.1252
ns
Fall time
t4
SR
–
3.1252
–1.562
–3.1252
ns
Description
Symbol
Values
ALE Extension
tA
TCL x [ALECTL]
Memory Cycle Time wait states
tC
2TCL x (15 - [MCTC])
Memory Tri-state Time
tF
2TCL x (1 - [MTTC])
t1
t3
t4
VIL
t2
tOSC
VIH2



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