ST72361AR4-Auto datasheet(131/279 Pages) STMICROELECTRONICS

131 / 279 page

ST72361xx-Auto

8-bit timer (TIM8)

Doc ID 12468 Rev 3

131/279

When the timer clock is fCPU/4, fCPU/8 or fCPU/8000, OCFi and OCMPi are set while the

counter value equals the OCiR register value plus 1 (see Figure 67).

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 8-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.

13.3.4

Forced compare output capability

When the FOLVi bit is set by software, the OLVLi bit is copied to the OCMPi pin. The OLVi bit

has to be toggled in order to toggle the OCMPi pin when it is enabled (OCiE bit = 1). The

OCFi bit is then not set by hardware, and thus no interrupt request is generated.

The FOLVLi bits have no effect in both one pulse mode and PWM mode.

Figure 65.

Output compare block diagram

Figure 66.

Output compare timing diagram, fTIMER =fCPU/2

OUTPUT COMPARE

8-bit

CIRCUIT

OC1R Register

8 BIT

FREE RUNNING

COUNTER

OC1E

CC0

CC1

OC2E

OLVL1

OLVL2

OCIE

(Control Register 1) CR1

(Control Register 2) CR2

OCF2

OCF1

(Status Register) SR

8-bit

OCMP1

OCMP2

Latch

OC2R Register

FOLV2 FOLV1

fCPU CLOCK

TIMER CLOCK

COUNTER REGISTER

OUTPUT COMPARE REGISTER i (OCRi)

OUTPUT COMPARE FLAG i (OCFi)

OCMPi PIN (OLVLi =1)

ST72361AR4-Auto Datasheet(PDF) 131 Page - STMicroelectronics

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