Difference between revisions of "KWV11-C programmable real-time clock"
From Computer History Wiki
m (Better cat) |
(describe functionality) |
||
| (One intermediate revision by the same user not shown) | |||
| Line 1: | Line 1: | ||
| − | [[Image:M4002.jpg|right|thumb| | + | [[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 | ||
| − | {{stub}} | + | 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]] | [[Category: QBUS Peripherals]] | ||
Latest revision as of 12:50, 11 April 2022
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:
- 1 MHz
- 100 KHz
- 10 KHz
- 1 KHz
- 100 Hz
- line rate from the AC power provided to the power supply
- external
The programming interface is fairly simple; there are two registers:
- 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 dual-height board (M4002).
External links
- LSI-11 Analog System User's Guide (EK-AXV11-UG-002) - the KWV11-C is covered in Chapter 5
- Microsystems Options (EK-192AA-MG-001) - configuration of the KWV11-C is covered on pp. 144-149 of the PDF
