P83C528FBA datasheet(16/26 Pages) PHILIPS

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Philips Semiconductors

Product specification

80C528/83C528

CMOS single-chip 8-bit microcontrollers

1995 Feb 02

EXPLANATION OF THE AC SYMBOLS

Each timing symbol has five characters. The

first character is always ‘t’ (= time). The other

characters, depending on their positions,

indicate the name of a signal or the logical

status of that signal. The designations are:

A – Address

C – Clock

D – Input data

H – Logic level high

I – Instruction (program memory contents)

L – Logic level low, or ALE

P – PSEN

Q – Output data

R – RD signal

t – Time

V – Valid

W – WR signal

X – No longer a valid logic level

Z – Float

Examples: tAVLL = Time for address valid

to ALE low.

tLLPL = Time for ALE low to

PSEN low.

tPXIZ

Figure 1. External Program Memory Read Cycle

ALE

PSEN

PORT 0

PORT 2

A8–A15

A0–A7

tAVLL

tPXIX

tLLAX

INSTR IN

tPLIV

tLHLL

tPLPH

tLLIV

tPLAZ

tLLPL

tAVIV

ALE

PSEN

PORT 0

PORT 2

Figure 2. External Data Memory Read Cycle

A0–A7

FROM RI OR DPL

DATA IN

A0–A7 FROM PCL

INSTR IN

P2.0–P2.7 OR A8–A15 FROM DPH

A8–A15 FROM PCH

tWHLH

tLLDV

tLLWL

tRLRH

tLLAX

tRLAZ

tAVLL

tRHDX

tRHDZ

tAVWL

tAVDV

tRLDV

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