參數(shù)資料
型號: AT80C31X2-SLSUM
廠商: Atmel
文件頁數(shù): 25/42頁
文件大?。?/td> 0K
描述: IC 8031 MCU ROMLESS 44PLCC
標準包裝: 972
系列: 80C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40/20MHz
連通性: UART/USART
外圍設(shè)備: POR
輸入/輸出數(shù): 32
程序存儲器類型: ROMless
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 管件
31
4428E–8051–02/08
AT/TS80C31X2
Table 14-7., Table 14-10. and Table 14-13. give the frequency derating formula of the AC
parameter. 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 14-4.
Max frequency for derating formula regarding the speed grade
Example:
TLLIV in X2 mode for a -V part at 20 MHz (T = 1/20
E6 = 50 ns):
T= 50ns
TLLIV= 2T - x = 2 x 50 - 25 = 75ns
Table 14-5.
External Program Memory Characteristics
-M X1 mode -M X2 mode -V X1 mode -V X2 mode -L X1 mode -L X2 mode
Freq (MHz)
40
20
40
30
20
T (ns)
25
50
25
33.3
50
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
PXAV
PSEN to Address Valid
T
AVIV
Address to Valid Instruction In
T
PLAZ
PSEN Low to Address Float
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