This driver uses the 8253 timer chip, channel 0, to implement the clock interrupt. The maximum timer interrupt interval is 55 ms; the interval can be set at a resolution of 0.838 microseconds. The timer interrupt handler is installed when RTKernelInit is called.

This driver calls RTKIRQTopPriority(1,8) at initialization to ensure that the timer interrupt is processed with the lowest interrupt priority. Applications requiring a different interrupt priority distribution should call RTKIRQTopPriority again after RTKernelInit.

Requirements: 8253 timer chip at address 40h, timer generates IRQ 0. Incompatible with drivers CLKHRTPC and HRTPC.

Left Kernel Clock

Down Driver CLKHRTPC