參數(shù)資料
型號(hào)： ST72124J2B7
廠(chǎng)商： 意法半導(dǎo)體
英文描述： 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
中文描述： 8位單電壓閃存，ADC和16位定時(shí)器，SPI和脊髓損傷界面微控制器
文件頁(yè)數(shù)： 59/125頁(yè)
文件大小： 776K
代理商： ST72124J2B7
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ST72334J/N, ST72314J/N, ST72124J
59/125
16-BIT TIMER
(Cont’d)
6.4.3.4 Output Compare
In this section, the index, i may be 1 or 2.
This function can be used to control an output
waveform or indicating when a period of time has
elapsed.
When a match is found between the Output Com-
pare register andthe free running counter, the out-
put 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 free run-
ning counter each timer clock cycle.
These registers are readable and writable and are
not affected by the timer hardware. A reset event
changes the OC
i
R value to 8000h.
Timing resolution is one count of the free running
counter: (
f
CPU/(CC1.CC0)
).
Procedure:
To use the output compare function, select the fol-
lowing in the CR2 register:
– Set the OCiE bit if an output is needed then the
OCMPi pin is dedicated to the output compare i
function.
– Select the timer clock (CC1-CC0) (see Table 14
Clock Control Bits).
And select the following in the CR1 register:
– Select theOLVLibit to appliedto theOCMPipins
after the match occurs.
– Set the OCIE bit to generate an interrupt if it is
needed.
When a match is found:
– OCFi bit is set.
– The OCMPi pin takes OLVLi bit value (OCMPi
pin latch is forced low during reset and stays low
until valid compares change it to a high level).
– 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).
The OC
i
R register value required for a specifictim-
ing application can be calculated using the follow-
ing formula:
Where:
t
= Desired output compare period (in sec-
onds)
= Internal clock frequency
PRESC
= Timer prescaler factor (2, 4 or 8 de-
pending on CC1-CC0bits, see Table14
Clock Control Bits)
Clearing the output compare interrupt request is
done by:
1. Reading the SR register while the OCFi bit is
set.
2. An access (read or write) to the OCiLR register.
The following procedure is recommended to pre-
vent the OCFi bit from being set between the time
it is read and the write to the OC
i
R register:
– Write to the OCiHR register (further compares
are inhibited).
– Read the SR register (first step of theclearance
of the OCFi bit, which may be already set).
– Write to the OCiLR register (enables the output
compare function and clears the OCFi bit).
Notes:
1. After a processor write cycle to the OCiHR reg-
ister, the output compare function is inhibited
until the OCiLR register is also written.
2. If the OCiE bit is not set, the OCMPi pin is a
general I/O port and the OLVLi bit will not
appear when a match is found but an interrupt
could be generated if the OCIE bit is set.
3. When the clock is divided by 2, OCFi and
OCMPi are set while the counter value equals
the OCiR register value (see Figure 42). This
behaviour is the same in OPM or PWM mode.
When the clock is divided by 4, 8 or in external
clock mode, OCFi and OCMPi are set while the
counter value equals the OCiR register value
plus 1 (see Figure 43).
4. 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.
5. The value in the 16-bit OC
i
R register and the
OLVi bit should be changed after each suc-
cessful comparison in order to control an output
waveform or establish a new elapsed timeout.
f
CPU
MS Byte
OCiHR
LS Byte
OCiLR
OCiR
OCiR =
t
*
f
CPU
PRESC
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ST72124J2T1 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
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ST72124J2T3 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
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