80C32 Datasheet, PDF (52/62 Pages) NXP Semiconductors – CMOS single-chip 8-bit microcontrollers

Philips Semiconductors
CMOS single-chip 8-bit microcontrollers
Product specification
80C52/80C54/80C58
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.
ALE
PSEN
PORT 0
PORT 2
t_LHLL
t_AVLL
t_LLPL
t_PLPH
t_LLIV
t_PLIV
t_LLAX
t_PLAZ
t_PXIX
A0–A7
INSTR IN
t_PXIZ
t_AVIV
A0–A15
A0–A7
A8–A15
ALE
PSEN
RD
PORT 0
PORT 2
Figure 13. External Program Memory Read Cycle
t_WHLH
t_LLDV
t_LLWL
t_RLRH
t_AVLL
t_LLAX
A0–A7
FROM RI OR DPL
t_RLAZ
t_RLDV
t_RHDX
DATA IN
t_AVWL
t_AVDV
P2.0–P2.7 OR A8–A15 FROM DPF
t_RHDZ
A0–A7 FROM PCL
A0–A15 FROM PCH
Figure 14. External Data Memory Read Cycle
SU00006
INSTR IN
SU00025
1996 Aug 16
22