TS80C31X2-LIB View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

TS80C31X2-LIB

8-bit CMOS Microcontroller ROMless

Atmel Corporation 

AT/TS80C31X2

Symbol

T

TLHLL

TAVLL

TLLAX

TLLIV

TLLPL

TPLPH

TPLIV

TPXIX

TPXIZ

TPXAV

TAVIV

TPLAZ

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

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= 25 (Table 14-7.)

T= 50ns

TLLIV= 2T - x = 2 x 50 - 25 = 75ns

Table 14-5. External Program Memory Characteristics

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

31

4428D–8051–08/05

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