參數(shù)資料
型號: 89C55
廠商: Atmel Corp.
英文描述: 8-Bit Microcontroller with 20K Bytes Flash
中文描述: 8位閃存微控制器20,000字節(jié)
文件頁數(shù): 22/24頁
文件大?。?/td> 606K
代理商: 89C55
AT89C55
4-190
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 measurements
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
floating when a 100 mV change from load volt-
age occurs. A port pin begins to float when a
100 mV change from the loaded V
OH
/V
OL
level
occurs.
Serial Port Timing: Shift Register Mode Test Conditions
The values in this table are valid for V
CC
= 5.0V
±
20% and Load Capacitance = 80 pF.
Symbol
Parameter
Min
Max
Units
t
XLXL
Serial Port Clock Cycle Time
12t
CLCL
ns
t
QVXH
Output Data Setup to Clock Rising Edge
10t
CLCL
- 133
ns
t
XHQX
t
XHDX
Output Data Hold After Clock Rising Edge
2t
CLCL
- 117
0
ns
Input Data Hold After Clock Rising Edge
ns
t
XHDV
Clock Rising Edge to Input Data Valid
10t
CLCL
- 133
ns
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