ST7MC1K2-Auto datasheet(112/371 Pages) STMICROELECTRONICS

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The OCiR register value required for a specific timing application can be calculated using

the following formula:

Equation 1

Where:

If the timer clock is an external clock, the formula is:

Equation 2

Where:

Clearing the output compare interrupt request (that is, clearing the OCFi bit) is done by:

Reading the SR register while the OCFi bit is set.

Accessing (reading or writing) the OCiLR register.

The following procedure is recommended to prevent the OCFi bit from being set between

the time it is read and the time it is written to the OCiR register:

●

Write to the OCiHR register (further compares are inhibited).

●

Read the SR register (first step in the clearance of the OCFi bit, which may be already

set).

●

Write to the OCiLR register (enables the output compare function and clears the OCFi

bit).

Note:

After a processor write cycle to the OCiHR register, the output compare function is inhibited

until the OCiLR register is also written.

If the OCiE bit is not set, the OCMPi pin is a general I/O port and the OLVLi bit does not

appear when a match is found but an interrupt could be generated if the OCIE bit is set.

In both internal and external clock modes, OCFi and OCMPi are set while the counter value

equals the OCiR register value (see Figure 48 for an example with fCPU/2 and Figure 49 for

an example with fCPU/4). This behavior is the same in OPM or PWM mode.

The output compare functions can be used both for generating external events on the

OCMPi pins even if the input capture mode is also used.

The value in the 16-bit OCiR register and the OLVi bit should be changed after each

successful comparison in order to control an output waveform or establish a new elapsed

timeout.

∆t =

output compare period (in seconds)

fCPU =

CPU clock frequency (in hertz)

PRESC =

timer prescaler factor (2, 4 or 8 depending on CC[1:0] bits, see Table 51)

∆t =

output compare period (in seconds)

fEXT =

external timer clock frequency (in hertz)

∆ OCiR= ∆

t * fCPU

PRESC

∆ OCiR= ∆t

* fEXT

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