87C552 datasheet(14/24 Pages) PHILIPS

Part #	87C552

Description	80C51 8-bit microcontroller 8K/256 OTP, 8 channel 10 bit A/D, I2C, PWM, capture/compare, high I/O

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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Philips Semiconductors

Product specification

87C552

80C51 8-bit microcontroller

8K/256 OTP, 8 channel 10 bit A/D, I2C, PWM, capture/compare, high I/O

1998 May 01

14

tLLAX

ALE

PSEN

PORT 0

PORT 2

WR

A0–A7

FROM RI OR DPL

DATA OUT

A0–A7 FROM PCL

INSTR IN

P2.0–P2.7 OR A8–A15 FROM DPH

A8–A15 FROM PCH

tWHLH

tLLWL

tWLWH

tAVLL

tAVWL

tQVWX

tWHQX

tDW

SU00213

Figure 4. External Data Memory Write Cycle

0.8V

tLOW

tHIGH

VIH1

0.8V

tCLCL

tr

tf

VIH1

0.8V

SU00214

Figure 5. External Clock Drive XTAL1

0

1

2

3

4

5

678

INSTRUCTION

ALE

CLOCK

OUTPUT DATA

WRITE TO SBUF

INPUT DATA

CLEAR RI

VALID

SET TI

SET RI

tXLXL

tQVXH

tXHQX

tXHDX

tXHDV

SU00027

12

3

0

456

7

Figure 6. Shift Register Mode Timing

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