63:32

27bc86bh

RO/V

Main Counter Tick Period (COUNTER_​CLK_​PER_​CAP)

This read-only field indicates the period at which the counter increments in femtoseconds (10^-15 seconds). The HPET timers use a 24MHz clock, which has a period of 41,666,667 femtoseconds. Therefore this register will always return 027BC86Bh when read.

31:16

8086h

RO

Vendor ID (VENDOR_​ID_​CAP)

These bits will return 8086h when read to reflect Intel as the vendor.

15

1h

RO

Legacy Rout Capable (LEG_​RT_​CAP)

This bit will always be 1 when read,indicating support for the Legacy Interrupt Rout.

14

0h

RO

Reserved (RSV)

These bits will return 0 when read. Writes will have no effect.

13

1h

RO

Counter Size (COUNT_​SIZE_​CAP)

This bit will return 1 when read to indicate support for 64-bit counters allowing 64 or 32-bit mode operation.

12:8

7h

RO

Number of Timers (NUM_​TIM_​CAP)

This value in this field will be 07h to indicate support for 8 timers in the timer block.

7:0

1h

RO

Revision ID (REV_​ID)

The value in this field will be 01h to indicate for revision 1.0 of the HPET specification.