| 摘要 |
<p>Data processing apparatus is described comprising a processor and at least one peripheral device. The processor is arranged to service the peripheral device either in an interrupt mode in which the peripheral device is serviced in response to interrupt signals generated by the peripheral device or in a timed mode in which the peripheral device is periodically polled and serviced if required. The apparatus has a dynamic switching arrangement for switching from the interrupt mode to the timed mode depending upon conditions dynamically determined within the apparatus, at least one of said conditions being that the rate at which the peripheral device generates interrupt signals exceeds a predefined or programmable threshold frequency. The rate of polling in the timed mode is less than the threshold frequency. Thus, dynamic switching between a interrupt driven mode and a timed mode is used in order to make more efficient use of shared system resources by servicing peripheral devices only periodically at times of high demand. <IMAGE></p> |
