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參數(shù)資料
| 型號： | HMS99C52 |
| 廠商： | Hynix Semiconductor Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 8位單晶片微控制器 |
| 文件頁數(shù)： | 31/43頁 |
| 文件大小： | 533K |
| 代理商： | HMS99C52 |
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HMS99C5X Series
Jan. 2003 Ver 1.0
27
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.
AC Characteristics for HMS99C5X series (12MHz version)
External Program Memory Characteristics
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.
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
Parameter
Symbol
12 MHz Oscillator
Variable Oscillator
1/t
CLCL
= 3.5 to 12MHz
Unit
Min.
Max.
Min.
Max.
ALE pulse width
t
LHLL
127
-
2t
CLCL
-40
-
ns
Address setup to ALE
t
AVLL
43
-
t
CLCL
-40
-
ns
Address hold after ALE
t
LLAX
30
-
t
CLCL
-53
-
ns
ALE low to valid instruction in
t
LLIV
-
233
-
4t
CLCL
-100
ns
ALE to PSEN
t
LLPL
58
-
t
CLCL
-25
-
ns
PSEN pulse width
t
PLPH
215
-
3t
CLCL
-35
-
ns
PSEN to valid instruction in
t
PLIV
-
150
-
3t
CLCL
-100
ns
Input instruction hold after PSEN
t
PXIX
0
-
0
-
ns
Input instruction float after PSEN
t
PXIZ
-
63
-
t
CLCL
-20
ns
Address valid after PSEN
t
PXAV
75
-
t
CLCL
-8
-
ns
Address to valid instruction in
t
AVIV
-
302
-
5t
CLCL
-115
ns
Address float to PSEN
t
AZPL
0
-
0
-
ns
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
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