T89C51AC2-RLSI-M datasheet(33/117 Pages) ATMEL

Part #	T89C51AC2-RLSI-M

Description	8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM

PDF	117 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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33 / 117 page

Draft.A - March 30, 2001

Preview - Confidential

T89C51AC2

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 20. 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.

3. When executing MOVX @DPTR instruction, if DPHDIS is set (Page Access Mode), P2 outputs SFR content instead of DPH.

Figure 21. 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.

3. When executing MOVX @DPTR instruction, if DPHDIS is set (Page Access Mode), P2 outputs SFR content instead of DPH.

ALE

RD#1

DPL or Ri

D7:0

DPH or P22,3

CPU Clock

ALE

WR#1

DPL or Ri

D7:0

CPU Clock

DPH or P22,3

T89C51AC2-RLSI-M Datasheet(PDF) 33 Page - ATMEL Corporation