HMS99C52 Datasheet, PDF (31/43 Pages) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

HMS99C5X Series
AC Characteristics
Explanation of the AC Symbols
Each timing symbol has 5 characters. The first character is always a ‘t’ (stand 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,
t_AVLL = Time from Address Valid to ALE Low
t_LLPL = Time from ALE Low to PSEN Low
AC Characteristics for HMS99C5X series (12MHz version)
V_CC= 5V :
V_CC= 5V + 10%, − 15%; V_SS= 0V; T_A= -40°C to 85°C
(C_L for port 0. ALE and PSEN outputs = 100pF; C_L for all other outputs = 80pF)
Variable clock : Vcc = 5V : 1/t_CLCL = 3.5 MHz to 12 MHz
External Program Memory Characteristics
Parameter
Symbol
12 MHz Oscillator
Variable Oscillator
1/t_CLCL = 3.5 to 12MHz
Unit
Min.
Max.
Min.
Max.
ALE pulse width
Address setup to ALE
Address hold after ALE
ALE low to valid instruction in
ALE to PSEN
PSEN pulse width
PSEN to valid instruction in
Input instruction hold after PSEN
Input instruction float after PSEN
Address valid after PSEN
Address to valid instruction in
Address float to PSEN
t_LHLL
t_AVLL
t_LLAX
t_LLIV
t_LLPL
t_PLPH
t_PLIV
t_PXIX
t_PXIZ ^†
t_PXAV ^†
t_AVIV
t_AZPL
127
-
2t_CLCL-40
-
ns
43
-
t_CLCL-40
-
ns
30
-
t_CLCL-53
-
ns
-
233
-
4t_CLCL-100
ns
58
-
t_CLCL-25
-
ns
215
-
3t_CLCL-35
-
ns
-
150
-
3t_CLCL-100
ns
0
-
0
-
ns
-
63
-
t_CLCL-20
ns
75
-
t_CLCL-8
-
ns
-
302
-
5t_CLCL-115
ns
0
-
0
-
ns
† _{Interfacing the HMS99C5X series to devices with float times up to 75 ns is permissible. This limited bus contention will not}
cause any damage to port 0 Drivers.
Jan. 2003 Ver 1.0
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