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P89V52X2FN датащи(PDF) 45 Page - NXP Semiconductors

номер детали P89V52X2FN
подробное описание детали  8-bit 80C51 low power 8 kB flash microcontroller with 256 B RAM, 192 B data EEPROM
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

P89V52X2FN датащи(HTML) 45 Page - NXP Semiconductors

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P89V52X2_1
© NXP B.V. 2007. All rights reserved.
Preliminary data sheet
Rev. 01 — 7 June 2007
45 of 56
NXP Semiconductors
P89V52X2
80C51 with 256 B RAM, 192 B data EEPROM
9.1 Explanation of symbols
Each timing symbol has 5 characters. The first character is always a ‘t’ (stands for time).
The other characters, depending on their positions, stand for the name of a signal or the
logical status of that signal. The following is a list of all the characters and what they stand
for.
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 — High impedance (Float)
Example:
tAVLL = Address valid to ALE LOW time
tLLPL = ALE LOW to PSEN LOW time
Fig 21. External program memory read cycle
002aaa548
port 2
PSEN
ALE
A0 to A7
tLLAX
tPLAZ
tPXIZ
tLLPL
tAVIV
tAVLL
tLLIV
tPLIV
tPLPH
INSTR IN
A8 to A15
A8 to A15
A0 to A7
port 0
tPXIX
tPXAV
tLHLL



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