P80C32 datasheet(44/62 Pages) PHILIPS

部件名	P80C32

功能描述	80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to 5.5 V, low power, high speed 30/33 MHz

PDF	62 Pages

Scroll/Zoom	100%

制造商	PHILIPS [NXP Semiconductors]

网页	http://www.nxp.com

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44 / 62 page

Philips Semiconductors

Product data

P80C3xX2; P80C5xX2;

P87C5xX2

80C51 8-bit microcontroller family

4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V),

low power, high speed (30/33 MHz)

2003 Jan 24

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

ALE

PSEN

PORT 0

PORT 2

A0–A15

A8–A15

A0–A7

tAVLL

tPXIX

tLLAX

INSTR IN

tLHLL

tPLPH

tLLIV

tPLAZ

tLLPL

tAVIV

SU00006

tPLIV

Figure 27. External Program Memory Read Cycle

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 DPF

A0–A15 FROM PCH

tWHLH

tLLDV

tLLWL

tRLRH

tLLAX

tRLAZ

tAVLL

tRHDX

tRHDZ

tAVWL

tAVDV

tRLDV

SU00025

Figure 28. External Data Memory Read Cycle

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