Rainbow-electronics T89C51AC2 Uživatelský manuál stáhnout pdf (Strana 22)

T89C51AC2

Rev. B – 19-Dec-01

For simplicity, the accompanying figures depict the bus cycle waveforms in idealized

form and do not provide precise timing information. For bus cycle timing parameters

refer to the Section “AC Characteristics” of the T89C51AC2 datasheet.

Figure 5. External Data Read Waveforms

Notes: 1. RD# signal may be stretched using M0 bit in AUXR register.

2. When executing MOVX @Ri instruction, P2 outputs SFR content.

Figure 6. External Data Write Waveforms

Notes: 1. WR# signal may be stretched using M0 bit in AUXR register.

2. When executing MOVX @Ri instruction, P2 outputs SFR content.

ALE

RD#1

DPL or Ri D7:0

DPH or P22

CPU Clock

ALE

WR#1

DPL or Ri D7:0

CPU Clock

DPH or P22

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 109 110

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Rainbow-electronics T89C51AC2 Uživatelský manuál Strana 22