P80C550 データシートの表示（PDF） - Philips Electronics

部品番号

コンポーネント説明

一致するリスト

P80C550

80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless, 8 channel 8 bit A/D, watchdog timer

Philips Electronics 

Philips Semiconductors

80C51 8-bit microcontroller family

4K/128 OTP/ROM/ROMless, 8 channel 8 bit A/D, watchdog timer

Product specification

80C550/83C550/87C550

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.

ALE

PSEN

PORT 0

PORT 2

tLHLL

tAVLL

tLLPL

tPLPH

tLLIV

tPLIV

tLLAX

tPLAZ

tPXIX

A0–A7

INSTR IN

tPXIZ

tAVIV

A0–A15

A0–A7

A8–A15

Figure 5. External Program Memory Read Cycle

SU00006

ALE

PSEN

RD

PORT 0

PORT 2

tWHLH

tLLDV

tLLWL

tRLRH

tAVLL

tLLAX

A0–A7

FROM RI OR DPL

tRLAZ

tRLDV

tRHDX

DATA IN

tAVWL

tAVDV

P2.0–P2.7 OR A8–A15 FROM DPF

tRHDZ

A0–A7 FROM PCL

A0–A15 FROM PCH

Figure 6. External Data Memory Read Cycle

INSTR IN

SU00025

1998 May 01

18

Share Link: