參數(shù)資料
型號(hào)： 935265441512
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 29/52頁(yè)
文件大?。?/td> 288K
代理商： 935265441512
Philips Semiconductors
Preliminary data
P89C51RB2/P89C51RC2/
P89C51RD2
80C51 8-bit Flash microcontroller family
16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM
2001 Jun 27
35
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 29. External Program Memory Read Cycle
ALE
PSEN
PORT 0
PORT 2
RD
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 30. External Data Memory Read Cycle
相關(guān)PDF資料
PDF描述
935265431112 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PDIP40
935265441118 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQCC44
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935265441518 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQCC44
935267813551 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PQFP44
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