參數(shù)資料
型號(hào): P89V51RD2
廠商: NXP Semiconductors N.V.
英文描述: 8-bit 80C51 5 V low power 64 kB Flash microcontroller with 1 kB RAM
中文描述: 8位80C51的5 V低功耗64 kB閃存1 KB RAM內(nèi)存控制器
文件頁(yè)數(shù): 67/77頁(yè)
文件大小: 350K
代理商: P89V51RD2
Philips Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
Product data
Rev. 03 — 02 December 2004
67 of 77
9397 750 14341
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
11.1 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:
T
AVLL
= Time from Address Valid to ALE LOW
T
LLPL
= Time from ALE LOW to PSEN LOW
Fig 30. External program memory read cycle.
002aaa548
PORT 2
PSEN
ALE
A0 - A7
tLLAX
tPLAZ
tPXIZ
tLLPL
tAVIV
tAVLL
tLHLL
tLLIV
tPLIV
tPLPH
INSTR IN
A8 - A15
A8 - A15
A0 - A7
PORT 0
tPXIX
tPXAV
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P89V51RD2FA 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 64K FLASH PLCC44
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P89V51RD2FA512 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 40MHZ LCC-44