Propeller Manual

Table Of Contents

2: Spin Language Reference – FRQA, FRQB

FRQA, FRQB

((PUB ┆ PRI))

FRQA

((PUB ┆ PRI))

FRQB

Returns: Current value of Counter A or Counter B Frequency Register, if used as a source

variable.

Explanation

FRQA and FRQB are two of six registers (CTRA, CTRB, FRQA, FRQB, PHSA, and PHSB) that affect the

behavior of a cog’s Counter Modules. Each cog has two identical counter modules (A and B)

that can perform many repetitive tasks. The

FRQA register contains the value that is

accumulated into the

PHSA register. The FRQB register contains the value that is accumulated

into the

PHSB register. See CTRA, CTRB on page 95 for more information.

Using FRQA and FRQB

FRQA and FRQB can be read/written just like any other register or pre-defined variable. For

example:

FRQA := $00001AFF

The above code sets FRQA to $00001AFF. Depending on the CTRMODE field of the CTRA

FRQA may be added into the PHSA register at a frequency determined by

the System Clock and the primary and/or secondary I/O pins. See

CTRA, CTRB on page 95 for

more information.

Propeller Manual v1.1 · Page 111