ST72561AR7-Auto datasheet(97/324 Pages) STMICROELECTRONICS

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ST72561-Auto

PWM auto-reload timer (ART)

Doc ID 12370 Rev 8

97/324

Each input capture can generate an interrupt independently on a selected input signal

transition. This event is flagged by a set of the corresponding CFx bits of the Input Capture

Control/Status register (ARTICCSR).

These input capture interrupts are enabled through the CIEx bits of the ARTICCSR register.

The active transition (falling or rising edge) is software programmable through the CSx bits

of the ARTICCSR register.

The read only input capture registers (ARTICRx) are used to latch the auto-reload counter

value when a transition is detected on the ARTICx pin (CFx bit set in ARTICCSR register).

After fetching the interrupt vector, the CFx flags can be read to identify the interrupt source.

Note:

After a capture detection, data transfer in the ARTICRx register is inhibited until the next

read (clearing the CFx bit).

The timer interrupt remains pending while the CFx flag is set when the interrupt is enabled

(CIEx bit set). This means, the ARTICRx register has to be read at each capture event to

clear the CFx flag.

The timing resolution is given by auto-reload counter cycle time (1/fCOUNTER).

Note:

During HALT mode, input capture is inhibited (the ARTICRx is never reloaded) and only the

external interrupt capability can be used.

The ARTICx signal is synchronized on CPU clock. It takes two rising edges until ARTICRx is

latched with the counter value. Depending on the prescaler value and the time when the

ICAP event occurs, the value loaded in the ARTICRx register may be different.

If the counter is clocked with the CPU clock, the value latched in ARTICRx is always the next

counter value after the event on ARTICx occurred (Figure 44).

If the counter clock is prescaled, it depends on the position of the ARTICx event within the

counter cycle (Figure 45).

Figure 44.

Input capture timing diagram, fCOUNTER = fCPU

04h

COUNTER

01h

fCOUNTER

xxh

02h

03h

05h

06h

07h

05h

ARTICx PIN

CFx FLAG

ICAP SAMPLED

INTERRUPT

fCPU

ICAP SAMPLED

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