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Phlips Semiconductors
Product specification
80C652/83C652
CMOS single-chip 8-bit microcontrollers
1997 Dec 05
15
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:
t
AVLL
= Time for address valid
to ALE low.
t
LLPL
= Time for ALE low
to PSEN low.
t
PXIZ
Figure 2. External Program Memory Read Cycle
ALE
PSEN
PORT 0
PORT 2
A8–A15
A8–A15
A0–A7
A0–A7
t
AVLL
t
PXIX
t
LLAX
INSTR IN
t
PLIV
t
LHLL
t
PLPH
t
LLIV
t
PLAZ
t
LLPL
t
AVIV
ALE
PSEN
PORT 0
PORT 2
Figure 3. External Data Memory Read Cycle
RD
A0–A7
FROM RI OR DPL
DATA IN
A0–A7 FROM PCL
INSTR IN
P2.0–P2.7 OR A8–A15 FROM DPH
A8–A15 FROM PCH
t
WHLH
t
LLDV
t
LLWL
t
RLRH
t
LLAX
t
RLAZ
t
AVLL
t
RHDX
t
RHDZ
t
AVWL
t
AVDV
t
RLDV
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