AT80C32X2 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT80C32X2' PDF : 55 Pages View PDF
TS8xCx2X2
External Program Memory
Characteristics
Table 28., Table 31. and Table 34. give the frequency derating formula of the AC param-
eter. To calculate each AC symbols, take the x value corresponding to the speed grade
you need (-M, -V or -L) and replace this value in the formula. Values of the frequency
must be limited to the corresponding speed grade:
Table 25. Max frequency for derating formula regarding the speed grade
Freq (MHz)
T (ns)
-M X1 mode -M X2 mode -V X1 mode -V X2 mode -L X1 mode -L X2 mode
40
20
40
30
30
20
25
50
25
33.3
33.3
50
Example:
TLLIV in X2 mode for a -V part at 20 MHz (T = 1/20E6 = 50 ns):
x= 22 (Table 28.)
T= 50ns
TLLIV= 2T - x = 2 x 50 - 22 = 78ns
Table 26. Symbol Description
Symbol
T
TLHLL
TAVLL
TLLAX
TLLIV
TLLPL
TPLPH
TPLIV
TPXIX
TPXIZ
TPXAV
TAVIV
TPLAZ
Parameter
Oscillator clock period
ALE pulse width
Address Valid to ALE
Address Hold After ALE
ALE to Valid Instruction In
ALE to PSEN
PSEN Pulse Width
PSEN to Valid Instruction In
Input Instruction Hold After PSEN
Input Instruction FloatAfter PSEN
PSEN to Address Valid
Address to Valid Instruction In
PSEN Low to Address Float
41
4184I–8051–02/08
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