ST7MC2S4 STMicroelectronics, ST7MC2S4 Datasheet - Page 82
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ST7MC2S4
Manufacturer Part Number
ST7MC2S4
Description
8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC,BRUSHLESS MOTOR CONTROL, 5 TIMERS, SPI, LINSCI(TM)
Manufacturer
STMicroelectronics
Datasheet
1.ST7MC1K4.pdf
(309 pages)
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ST7MC1xx/ST7MC2xx
16-BIT TIMER (Cont’d)
10.3.3.4 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 Com-
pare register and the free running counter, the out-
put 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.
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 fol-
lowing in the CR2 register:
– Set the OCiE bit if an output is needed then the
– Select the timer clock (CC[1:0]) (see
And select the following in the CR1 register:
– Select the OLVLi bit to applied to the OCMPi pins
– Set the OCIE bit to generate an interrupt if it is
When a match is found between OCRi register
and CR register:
– OCFi bit is set.
82/309
1
OCMPi pin is dedicated to the output compare i
signal.
Clock Control
after the match occurs.
needed.
– Assigns pins with a programmable value if the
– Sets a flag in the status register
– Generates an interrupt if enabled
OCiR
OCIE bit is set
f
CPU/
CC[1:0]
Bits).
i
R value to 8000h.
MS Byte
OCiHR
).
LS Byte
OCiLR
Table 16
– The OCMPi pin takes OLVLi bit value (OCMPi
– A timer interrupt is generated if the OCIE bit is
The OC
ing application can be calculated using the follow-
ing formula:
Where:
Δ
f
PRESC
If the timer clock is an external clock, the formula
is:
Where:
Δ
f
Clearing the output compare interrupt request (i.e.
clearing the OCFi bit) is done by:
1. Reading the SR register while the OCFi bit is
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
– Write to the OCiHR register (further compares
– Read the SR register (first step of the clearance
– Write to the OCiLR register (enables the output
CPU
EXT
t
t
pin latch is forced low during reset).
set in the CR2 register and the I bit is cleared in
the CC register (CC).
are inhibited).
of the OCFi bit, which may be already set).
compare function and clears the OCFi bit).
set.
i
R register value required for a specific tim-
= Output compare period (in seconds)
= CPU clock frequency (in hertz)
= Timer prescaler factor (2, 4 or 8 de-
= Output compare period (in seconds)
= External timer clock frequency (in hertz)
pending on CC[1:0] bits, see
Clock Control
Δ
Δ
OCiR =
OCiR =
Δt
Bits)
Δt
*
PRESC
f
EXT
*
f
CPU
i
R register:
Table 16
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