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AT89C51-24AC データシート(PDF) 14 Page - ATMEL Corporation

部品番号 AT89C51-24AC
部品情報  8-bit Microcontroller with 4K Bytes Flash
Download  17 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51-24AC データシート(HTML) 14 Page - ATMEL Corporation

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AT89C51
14
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 VIL 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 voltage occurs. A
port pin begins to float when 100 mV change from
the loaded VOH/VOL level occurs.
Serial Port Timing: Shift Register Mode Test Conditions
(V
CC = 5.0 V ± 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
µs
tQVXH
Output Data Setup to Clock Rising Edge
700
10tCLCL-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
tXHDV
Clock Rising Edge to Input Data Valid
700
10tCLCL-133
ns
t
XHDV
t
QVXH
t
XLXL
t
XHDX
t
XHQX
ALE
INPUT DATA
CLEAR RI
OUTPUT DATA
WRITE TO SBUF
INSTRUCTION
CLOCK
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
SET TI
SET RI
8
VALID
VALID
VALID
VALID
VALID
VALID
VALID
VALID
0.45V
TEST POINTS
V
- 0.5V
CC
0.2 V
+ 0.9V
CC
0.2 V
- 0.1V
CC
V
LOAD
+ 0.1V
Timing Reference
Points
V
LOAD
- 0.1V
LOAD
V
V
OL
+ 0.1V
V
OL
- 0.1V


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