80C52 Datasheet, PDF (12/23 Pages) Intel Corporation – CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

8XC52 54 58
EXPLANATION OF THE AC SYMBOLS
Each timing symbol has 5 characters The first char-
acter is always a ‘T’ (stands for time) The other
characters depending on their positions stand for
the name of a signal or the logical status of that
signal The following is a list of all the characters and
what they stand for
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
For example
TAVLL ^e Time from Address Valid to ALE Low
TLLPL ^e Time from ALE Low to PSEN Low
AC CHARACTERISTICS (Over Operating Conditions Load Capacitance for Port 0 ALE PROG and
PSEN ^e 100 pF Load Capacitance for All Other Outputs ^e 80 pF)
EXTERNAL MEMORY CHARACTERISTICS
All parameter values apply to all devices unless otherwise indicated In this table 8XC5X refers to 8XC5X
8XC5X-1 and 8XC5X-2
Oscillator
Symbol
Parameter
12 MHz 24 MHz 33 MHz
Variable
Units
Min Max Min Max Min Max
Min
Max
1 TCLCL Oscillator Frequency
8XC5X
8XC5X-1
8XC5X-2
8XC5X-24
8XC5X-33
35
12
MHz
35
16
MHz
05
12
MHz
35
24
MHz
35
33
MHz
TLHLL ALE Pulse Width 127
43
21
2 TCLCL ^b 40
ns
TAVLL Address Valid to
ALE Low
8XC5X
43
TCLCL ^b 40
ns
8XC5X-24
12
TCLCL ^b 30
ns
8XC5X-33
5
TCLCL ^b 25
ns
TLLAX Address Hold After
ALE Low
8XC5X -24
53
12
TCLCL ^b 30
ns
8XC5X-33
5
TCLCL ^b 25
ns
TLLIV
ALE Low to Valid
Instruction In
8XC5X
8XC5X-24
8XC5X-33
234
91
56
4 TCLCL ^b 100 ns
4 TCLCL ^b 75 ns
4 TCLCL ^b 65 ns
12