st72324bk STMicroelectronics, st72324bk Datasheet - Page 73

• Manufacturer Part Number: st72324bk
• Description: 3 V/5 V Range 8-bit Mcu With 4/8 Kbyte Rom, 10-bit Adc, Four Timers And Spi
• Manufacturer: STMicroelectronics

ST72323 ST72323L
Output compare
In this section, the index, i, may be 1 or 2 because there are 2 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:
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.
Table 38.
These registers are readable and writable and are not affected by the timer hardware. A
reset event changes the OC
Timing resolution is one count of the free running counter: (
Procedure:
To use the output compare function, select the following in the CR2 register:
●
●
And select the following in the CR1 register:
●
●
When a match is found between OCRi register and CR register:
●
●
●
The OC
the following formula:
Where:
●
●
●
–
–
–
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
Select the OLVLi bit to applied to the OCMPi pins after the match occurs.
Set the OCIE bit to generate an interrupt if it is needed.
OCFi bit is set.
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 CR1 register and the I bit is
cleared in the CC register (CC).
Δ
f
PRESC
CPU
t = Output compare period (in seconds)
OC1R/OC2R
i
R register value required for a specific timing application can be calculated using
Assigns pins with a programmable value if the OCiE bit is set
Sets a flag in the status register
Generates an interrupt if enabled
OCiR
= CPU clock frequency (in hertz)
= Timer prescaler factor (2, 4 or 8 depending on CC[1:0] bits, see
Output compare byte distribution
i
R value to 8000h.
Δ
MS byte
OCiR =
OCiHR
Table
Δt
PRESC
42).
*
f
CPU
f
CPU/
CC[1:0]
).
On-chip peripherals
LS byte
OCiLR
Table
42)
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