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OM5232/FBP

CMOS single-chip 8-bit microcontroller

Philips Electronics 

Philips Semiconductors

CMOS single-chip 8-bit microcontroller

Product specification

OM5232

ALE

PSEN

tWHLH

WR

PORT 0

PORT 2

tLLWL

tWLWH

tAVLL

tLLAX

A0–A7

FROM RI OR DPL

tAVWL

tQVWX

tDW

DATA OUT

P2.0–P2.7 OR A8–A15 FROM DPH

tWHQX

A0–A7 FROM PCL

A8–A15 FROM PCH

Figure 4. External Data Memory Write Cycle

INSTR IN

INSTRUCTION

ALE

CLOCK

OUTPUT DATA

WRITE TO SBUF

INPUT DATA

CLEAR RI

0

1

2

3

4

5

6

7

8

tXLXL

tQVXH

tXHQX

tXHDV

tXHDX

VALID

VALID

VALID

VALID

VALID

Figure 5. Shift Register Mode Timing

VALID

VALID

SET TI

VALID

SET RI

VIH1

0.8V

tCHCL

tCLCX

tCHCX

tCLCH

tCLCL

Figure 6. External Clock Drive at XTAL1

December 1994

10

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