AT83C51RB2-3CSCM View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT83C51RB2-3CSCM

80C51 High Performance ROM 8-bit Microcontroller

Atmel Corporation 

Shift Register Timing Waveforms

INSTRUCTION

ALE

CLOCK

OUTPUT DATA

WRITE to SBUF

INPUT DATA

CLEAR RI

0

1

2

3

TXLXL

TQVXH

TXHQX

0

1

2

TXHDV

VALID

TXHDX

VALID

VALID

4

3

VALID

5

4

VALID

6

5

VALID

7

8

6

7

SET TI

VALID

VALID

SET RI

External Clock Drive Waveforms

VCC-0.5V

0.45V

0.7VCC

0.2VCC-0.1

TCHCL

AC Testing Input/Output Waveforms

TCLCX

TCLCL

TCHCX

TCLCH

Float Waveforms

Clock Waveforms

INPUT/OUTPUT

VCC -0.5V

0.45V

0.2 VCC + 0.9

0.2 VCC - 0.1

AC inputs during testing are driven at VCC - 0.5 for a logic “1” and 0.45V for a logic “0”.

Timing measurement are made at VIH min for a logic “1” and VIL max for a logic “0”.

FLOAT

VOH - 0.1 V

VOL + 0.1 V

VLOAD

VLOAD + 0.1 V

VLOAD - 0.1 V

For timing purposes as port pin is no longer floating when a 100 mV changes from load

voltage occurs and begins to float when a 100 mV change from the loaded VOH/VOL level

occurs. IOL/IOH ≥ ± 20 mA.

Valid in normal clock mode. In X2 mode XTAL2 must be changed to XTAL2/2.

76 AT80C51RD2/AT83C51Rx2

4113B–8051–03/05

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