KW11-P Programmable Real-Time Clock

This manual provides comprehensive technical information for the KW11-P Programmable Real-Time Clock (M7228), designed for the PDP-11 computer system. It describes the device's functionality, which includes accurate time interval measurement, programmed real-time interval interrupts, interval counting in various modes, and operation as an external event counter. The document covers:

• General Description: An overview of functional units, including the 16-bit synchronous counter, count set buffer, and control/status register.
• Detailed Theory of Operation: In-depth explanations of address selection, gating control, clock logic, and interrupt sequence management.
• Installation: Procedures for installing the module into various PDP-11 family computers and connecting the line frequency (LTC) input.
• Programming: Sample assembly programs demonstrating single-interrupt mode, external interval timing, and external event counting.