S87L51FB-8A44 データシートの表示（PDF） - Philips Electronics
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S87L51FB-8A44 Datasheet PDF : 16 Pages
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Philips Semiconductors
CMOS single-chip 3.0V 8-bit microcontrollers
Product specification
87L51FA/87L51FB
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
tLLIV
tPLPH
tPLIV
tLLAX
A0–A7
tPLAZ
tPXIX
INSTR IN
tPXIZ
tAVIV
A0–A15
A0–A7
A8–A15
ALE
PSEN
RD
PORT 0
PORT 2
Figure 1. 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 2. External Data Memory Read Cycle
SU00056
INSTR IN
SU00025
1996 Aug 16
3-159
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