P80C652EBB PHILIPS [NXP Semiconductors], P80C652EBB Datasheet - Page 15

• Manufacturer Part Number: P80C652EBB
• Description: CMOS single-chip 8-bit microcontrollers
• Manufacturer: PHILIPS [NXP Semiconductors]

Phlips Semiconductors
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
1997 Dec 05
PORT 0
PORT 2
CMOS single-chip 8-bit microcontrollers
PSEN
ALE
RD
PORT 0
PORT 2
PSEN
ALE
t
AVLL
FROM RI OR DPL
A0–A7
t
LLAX
t
t
AVWL
LHLL
t
t
LLWL
AVLL
A0–A7
Figure 2. External Program Memory Read Cycle
t
P2.0–P2.7 OR A8–A15 FROM DPH
t
AVDV
RLAZ
t
Figure 3. External Data Memory Read Cycle
t
LLDV
Q – Output data
R – RD signal
t – Time
V – Valid
W – WR signal
X – No longer a valid logic level
Z – Float
Examples: t
t
AVIV
t
LLAX
LLPL
t
LLIV
t
t
PLIV
RLDV
A8–A15
t
t
t
AVLL
LLPL
PLAZ
PLPH
t
RLRH
t
PXIX
= Time for address valid
= Time for ALE low
to ALE low.
to PSEN low.
INSTR IN
15
t
RHDX
DATA IN
t
PXIZ
t
RHDZ
t
WHLH
A0–A7
A0–A7 FROM PCL
A8–A15 FROM PCH
A8–A15
80C652/83C652
Product specification
INSTR IN