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參數(shù)資料
| 型號： | 89LS8252 |
| 廠商： | Atmel Corp. |
| 英文描述： | 8-Bit Microcontroller with 8K Bytes Flash |
| 中文描述： | 8位具有8K字節(jié)的閃存，微控制器 |
| 文件頁數(shù)： | 29/31頁 |
| 文件大?。?/td> | 470K |
| 代理商： | 89LS8252 |
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AT89LS8252
4-165
Serial Port Timing: Shift Register Mode Test Conditions
The values in this table are valid for V
CC
= 2.7V to 6V and Load Capacitance = 80 pF.
Symbol
Parameter
12 MHz Oscillator
Variable Oscillator
Units
Min
Max
Min
Max
t
XLXL
Serial Port Clock Cycle Time
1.0
12t
CLCL
μ
s
t
QVXH
Output Data Setup to Clock
Rising Edge
700
10t
CLCL
- 133
ns
t
XHQX
Output Data Hold After Clock
Rising Edge
50
2t
CLCL
- 117
ns
t
XHDX
Input Data Hold After Clock
Rising Edge
0
0
ns
t
XHDV
Clock Rising Edge to Input Data
Valid
700
10t
CLCL
- 133
ns
Shift Register Mode Timing Waveforms
AC Testing Input/Output Waveforms
(1)
Notes:
1.
AC Inputs during testing are driven at V
CC
- 0.5V
for a logic 1 and 0.45V for a logic 0. Timing mea-
surements are made at V
IH
min. for a logic 1 and V
IL
max. for a logic 0.
Float Waveforms
(1)
Notes:
1.
For timing purposes, a port pin is no longer floating
when a 100 mV change from load voltage occurs. A
port pin begins to float when a 100 mV change from
the loaded V
OH
/V
OL
level occurs.
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