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P83C552IFB View Datasheet(PDF) - Philips Electronics

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P83C552IFB Datasheet PDF : 23 Pages
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Philips Semiconductors
Single-chip 8-bit microcontroller with 10-bit A/D,
capture/compare timer, high-speed outputs, PWM
Product data
80C552/83C552
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
tLHLL
ALE
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.
PSEN
PORT 0
tAVLL
tLLPL
tLLIV
tPLPH
tPLIV
tLLAX
tPLAZ
tPXIX
tPXIZ
A0–A7
INSTR IN
A0–A7
PORT 2
tAVIV
A8–A15
A8–A15
ALE
PSEN
RD
PORT 0
PORT 2
Figure 2. 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 DPH
tRHDZ
A0–A7 FROM PCL
A8–A15 FROM PCH
Figure 3. External Data Memory Read Cycle
SU01694
INSTR IN
SU01695
2002 Sep 03
16
 

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