參數(shù)資料
型號： ST72774S9T1/XXX
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44
封裝： TQFP-44
文件頁數(shù)： 91/144頁
文件大?。?/td> 1280K
代理商： ST72774S9T1/XXX
ST72774/ST727754/ST72734
50/144
16-BIT TIMER (Cont’d)
4.3.3.7 Pulse Width Modulation Mode
Pulse
Width
Modulation
mode
enables
the
generation of a signal with a frequency and pulse
length determined by the value of the OC1R and
OC2R registers.
The pulse width modulation mode uses the
complete Output Compare 1 function plus the
OC2R register.
Procedure
To use pulse width modulation mode select the
following in the CR1 register:
– Using the OLVL1 bit, select the level to be ap-
plied to the OCMP1 pin after a successful com-
parison with OC1R register.
– Using the OLVL2 bit, select the level to be ap-
plied to the OCMP1 pin after a successful com-
parison with OC2R register.
And select the following in the CR2 register:
– Set OC1E bit: the OCMP1 pin is then dedicated
to the output compare 1 function.
– Set the PWM bit.
– Select the timer clock (CC1-CC0) (see Table 15
Clock Control Bits).
Load
the
OC2R
register
with
the
value
corresponding to the period of the signal.
Load
the
OC1R
register
with
the
value
corresponding to the length of the pulse if
(OLVL1=0 and OLVL2=1).
If OLVL1=1 and OLVL2=0 the length of the pulse is
the difference between the OC2R and OC1R
registers.
The OCiR register value required for a specific
timing application can be calculated using the
following formula:
Where:
– t = Desired output compare period (seconds)
–fCPU = Internal clock frequency (see Miscella-
neous register)
– CC1-CC0 = Timer clock prescaler
The Output Compare 2 event causes the counter
to be initialized to FFFCh (See Figure 36).
Note: After a write instruction to the OC
iHR register, the
output compare function is inhibited until the OC
iLR
register is also written.
The OCF1 and OCF2 bits cannot be set by
hardware in PWM mode therefore the Output
Compare interrupt is inhibited. The Input Capture
interrupts are available.
When the Pulse Width Modulation (PWM) and
One Pulse Mode (OPM) bits are both set, the
PWM mode is the only active one.
Figure 36. Pulse Width Modulation Mode Timing
OC
iR Value =
t * fCPU
(CC1.CC0)
- 5
Counter
Counter is reset
to FFFCh
OCMP1 = OLVL2
Counter
= OC2R
OCMP1 = OLVL1
When
= OC1R
Pulse Width Modulation cycle
COUNTER
34E2
FFFC FFFD FFFE
2ED0 2ED1 2ED2
34E2
FFFC
OLVL2
OLVL1
OCMP1
compare2
compare1
compare2
Note: OC1R=2ED0h, OC2R=34E2, OLVL1=0, OLVL2= 1
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