View source for KWV11-C programmable real-time clock

[[Image:M4002.jpg|right|thumb|200px|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 [[interrupt]]s at a programmed rate (at a multiple of the base rate). Several different clock rates, five of them internal, are available:

* 1 MHz
* 100 KHz
* 10 KHz
* 1 KHz
* 100 Hz
* line rate from the [[alternating current|AC]] power provided to the [[power supply]]
* external

The programming interface is fairly simple; there are two [[register]]s:

* control/status
* buffer/preset

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 [[DEC card form factor|dual]]-height board ('''M4002''').

{{semi-stub}}

==External links==

* [http://www.vaxhaven.com/images/0/01/EK-AXV11-UG-002.pdf LSI-11 Analog System User's Guide] (EK-AXV11-UG-002) - the KWV11-C is covered in Chapter 5
* [http://www.bitsavers.org/pdf/dec/qbus/EK-192AA-MG-001_Microsystems_Options_Oct88.pdf Microsystems Options] (EK-192AA-MG-001) - configuration of the KWV11-C is covered on pp. 144-149 of the PDF

[[Category: QBUS Peripherals]]