Rainbow-electronics AT89C51SND1C Manual do Utilizador descarregar pdf (Página 188)

188

AT8xC51SND1C

4109E–8051–06/03

Figure 143. External 8-bit Bus Cycle - Data Write Waveforms

External IDE 16-bit Bus Cycles

Definition of Symbols Table 162. External IDE 16-bit Bus Cycles Timing Symbol Definitions

T

WHLH

T

AVWL

T

LLAX

T

WHQX

P2

P0

WR

ALE

T

LHLL

T

WLWH

A15:8

T

AVLL

T

QVWH

D7:0

Data Out

T

LLWL

A7:0

Signals Conditions

A Address H High

D Data In L Low

LALE VValid

Q Data Out X No Longer Valid

RRD

ZFloating

WWR

1 2 ... 183 184 185 186 187 188 189 190 191 192 193 ... 209 210

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