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AT89C2051-12SC Datasheet(PDF) 11 Page - ATMEL Corporation

Part No. AT89C2051-12SC
Description  8-bit Microcontroller with 2K Bytes Flash
Download  15 Pages
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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AT89C2051-12SC Datasheet(HTML) 11 Page - ATMEL Corporation

 
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AT89C2051
11
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Shift Register Mode Timing Waveforms
AC Testing Input/Output Waveforms
(1)
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 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 frothe
loaded VOH/VOL level occurs.
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
tXLXL
Serial Port Clock Cycle Time
1.0
12tCLCL
µs
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
tXHDX
Input Data Hold after Clock Rising Edge
0
0
ns
t
XHDV
Clock Rising Edge to Input Data Valid
700
10t
CLCL-133
ns


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