AT89C2051-12PA View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C2051-12PA

8-bit microcontroller with 2Kbytes flash, 2.7V to 6.0V

Atmel Corporation 

AT89C2051

Serial Port Timing: Shift Register Mode Test Conditions

(VCC = 5.0V ± 20%; Load Capacitance = 80 pF)

Symbol

Parameter

12 MHz Osc

Variable Oscillator

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

AC Testing Input/Output Waveforms(1) Float 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 measure-

ments 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 float-

ing 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.

4-25

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