参数资料
型号: ST72F324K2B3
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, SHRINK, PLASTIC, DIP-32
文件页数: 118/156页
文件大小: 1012K
代理商: ST72F324K2B3
ST72324J/K
64/156
16-BIT TIMER (Cont’d)
Notes:
1. After a processor write cycle to the OC
iHR reg-
ister, the output compare function is inhibited
until the OC
iLR register is also written.
2. If the OC
iE bit is not set, the OCMPi pin is a
general I/O port and the OLVL
i bit will not
appear when a match is found but an interrupt
could be generated if the OCIE bit is set.
3. When the timer clock is fCPU/2, OCFi and
OCMP
i are set while the counter value equals
the OC
iR register value (see Figure 48 on page
77). This behaviour is the same in OPM or
PWM mode.
When the timer clock is fCPU/4, fCPU/8 or in
external clock mode, OCF
i and OCMPi are set
while the counter value equals the OC
iR regis-
ter value plus 1 (see Figure 49 on page 77).
4. The output compare functions can be used both
for generating external events on the OCMP
i
pins even if the input capture mode is also
used.
5. The value in the 16-bit OCiR register and the
OLV
i bit should be changed after each suc-
cessful comparison in order to control an output
waveform or establish a new elapsed timeout.
Forced Compare Output capability
When the FOLV
i bit is set by software, the OLVLi
bit is copied to the OCMP
i pin. The OLVi bit has to
be toggled in order to toggle the OCMP
i pin when
it is enabled (OC
iE bit=1). The OCFi bit is then not
set by hardware, and thus no interrupt request is
generated.
The FOLVL
i bits have no effect in both one pulse
mode and PWM mode.
Figure 42. Output Compare Block Diagram
OUTPUT COMPARE
16-bit
CIRCUIT
OC1R Register
16 BIT FREE RUNNING
COUNTER
OC1E
CC0
CC1
OC2E
OLVL1
OLVL2
OCIE
(Control Register 1) CR1
(Control Register 2) CR2
0
OCF2
OCF1
(Status Register) SR
16-bit
OCMP1
OCMP2
Latch
1
Latch
2
OC2R Register
Pin
FOLV2 FOLV1
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