AT89C51-20PC(2000) Просмотр технического описания (PDF) - Atmel Corporation
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AT89C51-20PC Datasheet PDF : 17 Pages
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Serial Port Timing: Shift Register Mode Test Conditions
(VCC = 5.0 V ± 20%; Load Capacitance = 80 pF)
12 MHz Osc
Variable Oscillator
Symbol
Parameter
Min Max
Min
Max
tXLXL
tQVXH
tXHQX
tXHDX
tXHDV
Serial Port Clock Cycle Time
Output Data Setup to Clock Rising Edge
Output Data Hold after Clock Rising Edge
Input Data Hold after Clock Rising Edge
Clock Rising Edge to Input Data Valid
1.0
12tCLCL
700
10tCLCL-133
50
2tCLCL-117
0
0
700
10tCLCL-133
Units
µs
ns
ns
ns
ns
Shift Register Mode Timing Waveforms
INSTRUCTION
ALE
CLOCK
WRITE TO SBUF
OUTPUT DATA
CLEAR RI
INPUT DATA
0
1
2
3
4
5
6
7
8
tQVXH
0
tXHDV
VALID
tXLXL
tXHQX
1
VALID
2
tXHDX
VALID
3
VALID
4
VALID
5
VALID
6
7
SET TI
VALID
VALID
SET RI
AC Testing Input/Output Waveforms(1) Float Waveforms(1)
VCC - 0.5V
0.45V
0.2 VCC + 0.9V
TEST POINTS
0.2 VCC - 0.1V
VLOAD
V
+
LOAD
0.1V
V LOAD - 0.1V
Timing Reference
Points
V OL - 0.1V
V OL + 0.1V
Note:
1. AC Inputs during testing are driven at VCC - 0.5V for a
logic 1 and 0.45V for a logic 0. Timing measurements
are made at VIH min. for a logic 1 and VIL max. for a
logic 0.
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.
14
AT89C51
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