ST7LITE49K2 datasheet(122/245 Pages) STMICROELECTRONICS

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On-chip peripherals

ST7LITE49K2

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Output compare

In this section, the index, i, may be 1 or 2 because there are two output compare functions in

the 16-bit timer.

This function can be used to control an output waveform or indicate when a period of time

has elapsed.

When a match is found between the output compare register and the free running counter,

the output compare function:

●

Assigns pins with a programmable value if the OCIE bit is set

●

Sets a flag in the status register

●

Generates an interrupt if enabled

Two 16-bit registers output compare register 1 (OC1R) and output compare register 2

(OC2R) contain the value to be compared to the counter register each timer clock cycle.

These registers are readable and writable and are not affected by the timer hardware. A

reset event changes the OCiR value to 8000h.

Timing resolution is one count of the free running counter: (fCPU/CC[1:0]).

Procedure:

To use the output compare function, select the following in the CR2 register:

●

Set the OCiE bit if an output is needed then the OCMPi pin is dedicated to the output

compare i signal.

●

Select the timer clock (CC[1:0]) (see : Timer A control register 2 (TACR2) on page 132).

In the CR1 register select the following:

●

Select the OLVLi bit to be applied to the OCMPi pins after the match occurs.

●

Set the OCIE bit to generate an interrupt if it is needed.

When a match is found between OCRi register and CR register:

●

Set the OCFi bit.

●

The OCMPi pin takes OLVLi bit value (OCMPi pin latch is forced low during reset).

●

A timer interrupt is generated if the OCIE bit is set in the CR2 register and the I bit is

cleared in the CC register (CC).

MSB

LSB

OCiROCiHR

OCiLR

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