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| 型號： | HMS99C58S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH |
| 中文描述： | 8位單片機與嵌入式閃存微控制器 |
| 文件頁數(shù)： | 34/73頁 |
| 文件大?。?/td> | 696K |
| 代理商： | HMS99C58S |
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HMS99C51S/52S/54S/56S/58S
30
Sep. 2004 Ver 1.01
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 HMS99C51S/52S/54S/56S/58S (12MHz version)
External Program Memory Characteristics
Interfacing the HMS99C51S/52S/54S/56S/58S to devices with float times up to 75 ns is permissible. This limited bus conten-
tion 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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