P80C552IFA datasheet(16/23 Pages) PHILIPS

16 / 23 page

Philips Semiconductors

Product data

80C552/83C552

Single-chip 8-bit microcontroller with 10-bit A/D,

capture/compare timer, high-speed outputs, PWM

2002 Sep 03

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.

SU01694

tPXIZ

ALE

PSEN

PORT 0

PORT 2

A8–A15

A0–A7

tAVLL

tPXIX

tLLAX

INSTR IN

tPLIV

tLHLL

tPLPH

tLLIV

tPLAZ

tLLPL

tAVIV

Figure 2. External Program Memory Read Cycle

SU01695

ALE

PSEN

PORT 0

PORT 2

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

Figure 3. External Data Memory Read Cycle

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