83C51KB HIGH PERFORMANCE KEYBOARD MICROCONTROLLER 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 i...

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