EP80579 Datasheet, PDF (1158/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
32.2.1.4
Offset 0F0h: MAIN_CNT - Main Counter Value Register
General Behavioral Rules:
• Software can access the various bytes in this register using 32-bit or 64-bit
accesses.
• 32-bit accesses can be done to offset 0F0h or 0F4h.
• 32-bit accesses must not be done starting at: 0F1h, 0F2h, 0F3h, 0F5h, 0F6h, or
0F7h.
• 64-bit accesses can be done to 0F0h.
• Writes to this register must only be done while the counter is halted.
• Reads to this register return the current value of the main counter.
• 32-bit counters will always return zero for the upper 32 bits of this register.
• If 32-bit software attempts to read a 64-bit counter, it must first halt the counter.
Since this will delay the interrupts for all of the timers, this must be done only if the
consequences are understood. It is strongly recommended that 32-bit software
only operate the timer in 32-bit mode.
Table 32-5. Offset 0F0h: MAIN_CNT - Main Counter Value Register
Description:
View: IA F
Base Address: HPTC
Offset Start: 0F0h
Offset End: 0F7h
Size: 64 bit
Default: Xh
Power Well: Core
Bit Range Bit Acronym
Bit Description
Sticky
63 :00
Counter Value: Bits 63:00 of the counter.
Notes:
1.
Writes to this register must only be done while
the counter is halted.
2.
Reads to this register return the current value of
the main counter.
3.
32-bit counters always return zero for the upper
32 bits of this register.
4.
COUNTER_VAL_
63_0
If 32-bit software attempts to read a 64-bit
counter, it must first halt the counter. Since this
delays the interrupts for all of the timers, this
must be done only if the consequences are
understood. It is strongly recommended that 32-
bit software only operates the timer in 32-bit
mode.
5.
Reads to this register are monotonic. No two
consecutive reads return the same value. The
second of two reads always returns a larger
value, unless the timer has rolled over to 0.
Bit Reset
Value
Xh
Bit Access
RW
Intel^® EP80579 Integrated Processor Product Line Datasheet
1158
August 2009
Order Number: 320066-003US