Rainbow-electronics T89C51AC2 Manual do Utilizador descarregar pdf (Página 99)

T89C51AC2

Rev. B – 19-Dec-01

Table 61. AC Parameters for a Variable Clock

18.4.3 External Program

Memory Read Cycle

Symbol Type

Standard

Clock X2 Clock X parameter Units

LHLL

Min 2 T - x T - x 10 ns

AVLL

Min T-x 0.5T-x 15 ns

LLAX

Min T-x 0.5T-x 15 ns

LLIV

Max 4T-x 2T-x 30 ns

LLPL

Min T-x 0.5T-x 10 ns

PLPH

Min 3T-x 1.5T-x 20 ns

PLIV

Max 3T-x 1.5T-x 40 ns

PXIX

Min x x 0 ns

PXIZ

Max T-x 0.5T-x 7 ns

AVIV

Max 5T-x 2.5T-x 40 ns

PLAZ

Max x x 10 ns

PLIV

TPLAZ

ALE

PSEN

PORT 0

PORT 2

A0-A7A0-A7 INSTR ININSTR IN INSTR IN

ADDRESS

OR SFR-P2

ADDRESS A8-A15ADDRESS A8-A15

12 T

CLCL

AVIV

LHLL

AVLL

LLIV

LLPL

PLPH

PXAV

PXIX

PXIZ

LLAX

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 109 110

T89C51AC2 1

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