EP80579 Datasheet, PDF (1162/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
— The value in this register does not change based on the interrupt being
generated.
• If the timer is configured to periodic mode:
— When the main counter equals the value last written to this register, the
corresponding interrupt can be generated (if so enabled).
— After the main counter equals the value in this register, the value in this
register is increased by the value last written to the register.
• For example, if the value written to the register is 00000123h, then:
— An interrupt is generated when the main counter reaches 00000123h.
— The value in this register is then adjusted by the hardware to 00000246h.
— Another interrupt is generated when the main counter reaches 00000246h.
— The value in this register is then adjusted by the hardware to 00000369h.
• As each periodic interrupt occurs, the value in this register increments. When the
incremented value is greater than the maximum value possible for this register
(FFFFFFFFh for a 32-bit timer or FFFFFFFFFFFFFFFFh for a 64-bit timer), the value
wraps around through 0. For example, if the current value in a 32-bit timer is
FFFF0000h and the last value written to this register is 20000, then after the next
interrupt the value changes to 00010000h.
• Default value for each timer is all 1's for the bits that are implemented. For
example, a 32-bit timer has a default value of 00000000FFFFFFFFh. A 64-bit timer
has a default value of FFFFFFFFFFFFFFFFh.
Intel^® EP80579 Integrated Processor Product Line Datasheet
1162
August 2009
Order Number: 320066-003US