Rainbow-electronics AT89C55WD Manual de usuario descargar pdf (Pagina 20)

AT89C55WD

1921B–MICRO–09/02

Figure 12. External Clock Drive Configuration

XTAL2

XTAL1

GND

EXTERNAL

OSCILLATOR

SIGNAL

Table 8 . Status of External Pins During Idle and Power-down Modes

Mode Program Memory ALE PSEN PORT0 PORT1 PORT2 PORT3

Idle Internal 1 1 Data Data Data Data

Idle External 1 1 Float Data Address Data

Power-down Internal 0 0 Data Data Data Data

Power-down External 0 0 Float Data Data Data

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 36 37

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Rainbow-electronics AT89C55WD Manual de usuario Pagina 20