Rainbow-electronics W78C52D Manual do Utilizador descarregar pdf (Página 13)

Preliminary W78C52D

Publication Release Date: December 1998

- 13 - Revision A1

TIMING WAVEFORMS

Program Fetch Cycle

S1

XTAL1

S2 S3 S4 S5 S6 S1 S2 S3 S4 S5 S6

ALE

PORT 2

A0-A7

A0-A7

Data

A0-A7

Code

T

A0-A7

Data

Code

PORT 0

PSEN

PDH,

T

PDZ

T

PDA

T

AAH

T

AAS

T

PSW

T

APL

T

ALW

Data Read Cycle

S2 S3S5 S6 S1S2 S3 S4S5 S6 S1S4

XTAL1

ALE

PSEN

DATA

A8-A15

PORT 2

PORT 0

A0-A7

RD

T

DDH,

T

DDZ

T

DDA

T

DRD

T

DAR

1 2 ... 8 9 10 11 12 13 14 15 16 17 18

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