IS89C52 データシートの表示（PDF） - Integrated Silicon Solution

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IS89C52

CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH

Integrated Silicon Solution 

IS89C52

ISSI ®

ALE

PSEN

WR

PORT 0

PORT 2

tWHLH

tLLWL

tWLWH

tAVLL

tLLAX

A7-A0 FROM RI OR DPL

tAVWL

tQVWX

DATA OUT

A15-A8 FROM DPH

tWHQX

A7-A0 FROM PCL

INSTR IN

A15-A8 FROM PCH

Figure 37. External Data Memory Write Cycle

INSTRUCTION

ALE

CLOCK

DATAOUT

DATAIN

0

1

2

3

4

5

6

7

8

tXLXL

tQVXH

0

tXHQX

1

tXHDV

VALID

VALID

2

tXHDX

VALID

3

VALID

4

VALID

5

VALID

Figure 38. Shift Register Mode Timing Waveform

6

VALID

7

SET TI

VALID

SET RI

Vcc – 0.5V

0.45V

0.7Vcc

0.2Vcc – 0.1

tCHCL

tCLCX

tCHCX

tCLCH

tCLCL

Figure 39. External Clock Drive Waveform

Vcc - 0.5V

0.45V

0.2Vcc + 0.9V

0.2Vcc - 0.1V

Figure 40. AC Test Point

Note:

1. AC inputs during testing are driven at VCC – 0.5V for logic “1” and 0.45V for logic “0”.

Timing measurements are made at VIH min for logic “1” and max for logic “0”.

Integrated Silicon Solution, Inc. — 1-800-379-4774

49

MC013-1C

11/21/98

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