DHQ1ECCSECETS1SR1WH View Datasheet(PDF) - Intel

Part Name

Description

Manufacturer

DHQ1ECCSECETS1SR1WH

Intel® Quark SoC X1000

Intel 

Intel® Quark SoC X1000—Legacy Bridge

The count is held in the latch until it is read or the counter is reprogrammed. The count

is then unlatched. This allows reading the contents of the counters on the fly without

affecting counting in progress. Multiple Counter Latch Commands may be used to latch

more than one counter. Counter Latch Commands do not affect the programmed mode

of the counter in any way.

If a Counter is latched and then, some time later, latched again before the count is

read, the second Counter Latch Command is ignored. The count read will be the count

at the time the first Counter Latch Command was issued.

21.8.2.2.3

Read Back Command

The Read Back Command, written to port 43h, latches the count value, programmed

mode, and current states of the OUT pin and Null Count flag of the selected counter or

counters. The value of the counter and its status may then be read by I/O access to the

counter address.

The Read Back Command may be used to latch multiple counter outputs at one time.

This single command is functionally equivalent to several counter latch commands, one

for each counter latched. Each counter's latched count is held until it is read or

reprogrammed. Once read, a counter is unlatched. The other counters remain latched

until they are read. If multiple count Read Back Commands are issued to the same

counter without reading the count, all but the first are ignored.

The Read Back Command may additionally be used to latch status information of

selected counters. The status of a counter is accessed by a read from that counter's I/

O port address. If multiple counter status latch operations are performed without

reading the status, all but the first are ignored.

Both count and status of the selected counters may be latched simultaneously. This is

functionally the same as issuing two consecutive separate Read Back Commands. If

multiple count and/or status Read Back Commands are issued to the same counters

without any intervening reads, all but the first are ignored.

If both count and status of a counter are latched, the first read operation from that

counter returns the latched status, regardless of which was latched first. The next one

or two reads, depending on whether the counter is programmed for one or two type

counts, return the latched count. Subsequent reads return unlatched count.

21.8.3

Register Map

See Chapter 5.0, “Register Access Methods” for additional information.

Intel® Quark SoC X1000

DS

860

October 2013

Document Number: 329676-001US

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