Information in this document is provided in connection with Intel products. Intel assumes no liability whatsoever, including infringement of

any patent or copyright, for sale and use of Intel products except as provided in Intel’s Terms and Conditions of Sale for such products.

Intel retains the right to make changes to these specifications at any time, without notice. Microcontroller products may have minor varia-

tions to this specification known as errata.

COPYRIGHT © INTEL CORPORATION, 1996

March 1996

Order Number: 272800-001

83C51KB

HIGH PERFORMANCE

KEYBOARD MICROCONTROLLER

The 83C51KB is a highly integrated keyboard microcontroller for the standard and advanced desktop

keyboard industry. The integration of external components into the microcontroller reduces overall keyboard

control system manufacturing cost in terms of the number of components used, the amount of PCB space

required, reduced inventory, and a reduction in required assembly activities. In addition, the integration

reduces the number and amount of software routines needed for signal debounce and input status poll

operation. There is a resultant reduction in CPU overhead as well as on-chip memory requirements. The

83C51KB product line is manufactured with Intel state of the art complimentary high-performance metallic

oxide semiconductor (CHMOS) design rules.

s Direct Drive LED Outputs

— Four Pins (P3.7:4)

— 13 mA Typical Current Sink

Capability

s 20 pF Cap On-chip for RC Resonator

— Frequency Selectable (4-6 MHz)

s 8 Dedicated Key Scan Input (KSI) Pins

— Schmitt-trigger Inputs

— External Interrupt

— Level Detect Interrupt Mode for

Automatic Power-down Exit

s 16 Dedicated Key Scan Output (KSO)

Pins with Quasi-bidirectional Port

Drivers

— No External Resistor Required

— Located on P0.7:0 and P2.7:0

s 4-Kbyte On-chip ROM Memory

s 128-byte On-chip RAM Memory

s Clock/Data Drivers to Motherboard

— Strong Pullup Drivers for Keyboard

Cable Communication

— 8X42 Compatible Interface

— Selectable external interrupt for

Clock

s ONCE mode (On-chip Emulation)

s Power-on Reset Mode

— Automatic Operation

s 5 Volt D.C. Operation

s Reduces Manufacturing Cost by

Reducing Overall Component Count

s Configurable Timer (16 bit or 2 by 8 Bit)

s Uses Industry Standard Design Tools

s Control Oriented Instruction Set

s Industry Standard Architecture