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參數(shù)資料
| 型號(hào)： | 89C2051 |
| 廠商： | Atmel Corp. |
| 英文描述： | 8-Bit Microcontroller with 2K Bytes Flash |
| 中文描述： | 8位閃存微控制器2K字節(jié) |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 251K |
| 代理商： | 89C2051 |
AT89C2051
4-25
Serial Port Timing: Shift Register Mode Test Conditions
(V
CC
= 5.0V
±
20%; Load Capacitance = 80 pF)
Symbol
Parameter
12 MHz Osc
Variable Oscillator
Units
Min
Max
Min
Max
t
XLXL
Serial Port Clock Cycle Time
1.0
12t
CLCL
μ
s
t
QVXH
t
XHQX
Output Data Setup to Clock Rising Edge
700
10t
CLCL
-133
2t
CLCL
-117
ns
Output Data Hold After Clock Rising Edge
50
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)
Note:
1.
AC Inputs during testing are driven at V
CC
- 0.5V for
a logic 1 and 0.45V for a logic 0. Timing measure-
ments are made at V
IH
min. for a logic 1 and V
IL
max. for a logic 0.
Float Waveforms
(1)
Note:
1.
For timing purposes, a port pin is no longer float-
ing when a 100 mV change from load voltage
occurs. A port pin begins to float when 100 mV
change frothe loaded V
OH
/V
OL
level occurs.
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