Rainbow-electronics T89C51RD2 Manual do Utilizador descarregar pdf (Página 42)

42 Rev. F - 15 February, 2001

T89C51RD2

This table shows the state of ports during idle and power-down modes.

* Port 0 can force a 0 level. A "one" will leave port floating.

Mode

Program

Memory

ALE PSEN PORT0 PORT1 PORT2 PORT3

Idle Internal 1 1 Port Data* Port Data Port Data Port Data

Idle External 1 1 Floating Port Data Address Port Data

Power Down Internal 0 0 Port Dat* Port Data Port Data Port Data

Power Down External 0 0 Floating Port Data Port Data Port Data

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 85 86

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Rainbow-electronics T89C51RD2 Manual do Utilizador Página 42