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80C451 View Datasheet(PDF) - Philips Electronics

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80C451 Datasheet PDF : 22 Pages
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Philips Semiconductors
80C51 8-bit microcontroller family
4K/128 OTP/ROM/ROMless, expanded I/O
Product specification
80C451/83C451/87C451
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 2. 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 DPH
tRHDZ
A0–A7 FROM PCL
A0–A15 FROM PCH
Figure 3. External Data Memory Read Cycle
INSTR IN
SU00007
1998 May 01
13
 

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