ST72F324K2TATX 데이터 시트보기 (PDF) - STMicroelectronics

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ST72F324K2TATX

8-bit MCU for automotive, 3.8 to 5.5V operating range with 8 to 32 Kbyte Flash, 10-bit ADC, 4 timers, SPI, SCI

STMicroelectronics 

On-chip peripherals

ST72324xx-Auto

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.

ct(s Table 45. Output compare byte distribution

du Register

MS byte

ro OCiR

OCiHR

LS byte

OCiLR

te P These registers are readable and witable and are not affected by the timer hardware. A

le reset event changes the OCiR value to 8000h.

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

b Procedure

- O To use the Output Compare function, select the following in the CR2 register:

t(s) ● Set the OCiE bit if an output is needed then the OCMPi pin is dedicated to the output

compare i signal.

uc ● Select the timer clock (CC[1:0]) (see Table 50).

rod And select the following in the CR1 register:

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

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

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

o ● OCFi bit is set

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

O ● A timer interrupt is generated if the OCIE bit is set in the CR1 register and the I bit is

cleared in the CC register (CC).

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

the following formula:

Δ OCiR = Δt * fCPU

PRESC

Where:

Δt

= 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 50)

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Doc ID 13841 Rev 1

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