Техническая Спецификация для Intel C2550 FH8065401488912
Модели
FH8065401488912
Intel
®
Atom™ Processor C2000 Product Family for Microserver
September 2014
Datasheet, Vol. 2 of 3
Order Number: 330061-002US
531
Volume 2—8254 Programmable Interval Timer (PIT)—C2000 Product Family
Architectural Overview
27.3.1.2
Counter Latch Command
This command latches the current count value and ensures the count read from the
counter is accurate. The count value is then read from each counter count register
through the Counter Ports Access Ports Register (40h for counter 0, 41h for counter 1,
and 42h for counter 2). The count must be read according to the programmed format,
i.e., if the counter is programmed for 2-byte counts, 2 bytes must be read.
The 2 bytes do not have to be read one right after the other (read, write, or
programming operations for other counters are inserted between the reads). If a
counter is latched once and then latched again before the count is read, the second
Counter Latch command is ignored.
See
for additional
programming information.