參數(shù)資料
型號： AT80C51RD2
廠商： Atmel Corp.
英文描述： ER 6C 3#16 3#8 SKT RECP BOX
中文描述： 80C51的高性能ROM的8位微控制器
文件頁數(shù)： 69/81頁
文件大小： 1082K
代理商： AT80C51RD2
70
AT80C51RD2/AT83C51Rx2
4113A–8051–09/02
AC Parameters
Explanation of the AC
Symbols
Each timing symbol has 5 characters. The first character is always a “t” (stands for time).
The other characters, depending on their positions, stand for the name of a signal or the
logical status of that signal. The following is a list of all the characters and what they
stand for.
Example:T
AVLL
= Time for Address Valid to ALE Low.
T
LLPL
= Time for ALE Low to PSEN Low.
(Load Capacitance for port 0, ALE and PSEN = 100 pF; Load Capacitance for all other
outputs = 80 pF.)
Table 49 Table 52, and Table 54 give the description of each AC symbols.
Table 51, Table 53 and Table 55 give for each range the AC parameter.
Table 50, Table 51 and Table 56 gives the frequency derating formula of the AC param-
eter for each speed range description. To calculate each AC symbols. take the x value
in the correponding column (-M or -L) and use this value in the formula.
Example: T
LLIU
for -M and 20 MHz, Standard clock.
x = 35 ns
T = 50 ns
T
CCIV
= 4T - x = 165 ns
External Program Memory
Characteristics
Table 49.
Symbol Description
Symbol
Parameter
T
Oscillator clock period
T
LHLL
ALE pulse width
T
AVLL
Address Valid to ALE
T
LLAX
Address Hold After ALE
T
LLIV
ALE to Valid Instruction In
T
LLPL
ALE to PSEN
T
PLPH
PSEN Pulse Width
T
PLIV
PSEN to Valid Instruction In
T
PXIX
Input Instruction Hold After PSEN
T
PXIZ
Input Instruction FloatAfter PSEN
T
AVIV
Address to Valid Instruction In
T
PLAZ
PSEN Low to Address Float
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