FW82801EB Intel, FW82801EB Datasheet - Page 585
FW82801EB
Manufacturer Part Number
FW82801EB
Description
Manufacturer
Intel
Datasheet
1.FW82801EB.pdf
(671 pages)
Specifications of FW82801EB
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Intel
®
82801EB ICH5 / 82801ER ICH5R Datasheet
TIMn_COMP—Timer n Comparator Value Register
Address Offset:
Attribute:
Default Value:
63:0
Bit
Timer Compare Value — R/W. Reads to this register return the current value of the comparator.
Timers 0, 1, or 2 are configured to non-periodic mode:
Writes to this register load the value against which the main counter should be compared for this
timer.
Timer 0 is configured to periodic mode:
Default value for each timer is all 1s 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.
• When the main counter equals the value last written to this register, the corresponding
• The value in this register does not change based on the interrupt being generated.
• When the main counter equals the value last written to this register, the corresponding
• After the main counter equals the value in this register, the value in this register is increased
• As each periodic interrupt occurs, the value in this register will increment. When the
interrupt can be generated (if so enabled).
interrupt can be generated (if so enabled).
by the value last written to the register.
For example, if the value written to the register is 00000123h, then
1. An interrupt will be generated when the main counter reaches 00000123h.
2. The value in this register will then be adjusted by the hardware to 00000246h.
3. Another interrupt will be generated when the main counter reaches 00000246h
4. The value in this register will then be adjusted by the hardware to 00000369h
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 will wrap 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 will change to
00010000h
Timer 0: 108h–10Fh,
Timer 1: 128h–12Fh,
Timer 2: 148h–14Fh
R/W
N/A
Description
Size:
High-Precision Event Timer Registers
64 bit
585
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