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P80C31X2 View Datasheet(PDF) - NXP Semiconductors.

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P80C31X2 Datasheet PDF : 62 Pages
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Philips Semiconductors
80C51 8-bit microcontroller family
4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V),
low power, high speed (30/33 MHz)
Product data
P80C3xX2; P80C5xX2;
P87C5xX2
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
ALE
PSEN
RD
PORT 0
PORT 2
Figure 27. External Program Memory Read Cycle
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 DPF
tRHDZ
A0–A7 FROM PCL
A0–A15 FROM PCH
Figure 28. External Data Memory Read Cycle
SU00006
INSTR IN
SU00025
2003 Jan 24
44
 

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