參數(shù)資料
型號: P87C51RA2BBD
廠商: NXP SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PT06; No. of Contacts:18; Connector Shell Size:14; Connecting Termination:Solder; Circular Shell Style:Straight Plug; Gender:Female
中文描述: 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, PQFP44
封裝: 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, SOT-389-1, LQFP-44
文件頁數(shù): 23/34頁
文件大?。?/td> 394K
代理商: P87C51RA2BBD
2001 Apr 06
23
Philips Semiconductors
Preliminary specification
P87C51MB2/P87C51MC2
80C51 8-bit microcontroller family with extended memory
64KB/96KB OTP with 2KB/3KB RAM
EXPLANATION OF 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:
t
AVLL
- Time for address valid to ALE low.
t
LLPL
- Time for ALE low to PSEN low
Figure 1: External Program Memory Read Cycle (Non-Extended Memory Cycle)
t
PLIV
t
PLAZ
t
PXIX
t
LLAX
t
AVLL
t
PXIZ
ALE
PSEN
PORT 0
PORT 2
A0-A7
INSTR IN
P2.0-P2.7 OR A8-A15
A0-A7
t
AVIV
t
LHLL
t
LLIV
t
PLPH
t
LLPL
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