KWV11-C programmable real-time clock
The KWV11-C programmable real-time clock is a QBUS clock module, very similar in functionality to the KW11-P Programmable Real-Time Clock. It can either provide interval counting, or produce either single or repeated interrupts at a programmed rate (at a multiple of the base rate). Several different clock rates, five of them internal, are available:
The programming interface is fairly simple; there are two registers:
The counter register can be set to count up, governed by the selected rate; an interrupt can be triggered when it reaches 0 on overflow. It can then optionally be automatically reloaded from the preset register.
Physically, the KW11-P is an dual-height board (M4002).