參數資料
型號： ST72774S9T1
廠商： 意法半導體
元件分類： ADC
英文描述： 8-BIT USB MCU FOR MONITORS, WITH UP TO 60K OTP, 1K RAM, ADC, TIMER, SYNC, TMU, PWM/BRM, H/W DDC & I2C
中文描述： 8位USB單片機的顯示器，高達60K章檢察官辦公室，每1000內存，模數轉換器，定時器，同步，材質單元，脈寬調制/的BRM，的H / W DDC的
文件頁數： 45/144頁
文件大小： 1280K
代理商： ST72774S9T1
ST72774/ST727754/ST72734
45/144
16-BIT TIMER
(Cont’d)
4.3.3.3 Input Capture
In this section, the index,
i
, may be 1 or 2.
The two input capture 16-bit registers (IC1R and
IC2R) are used to latch the value of the free
running counter after a transition detected by the
ICAP
i
pin (see figure 5).
IC
i
Rregister is a read-only register.
The active transition is software programmable
through the IEDG
i
bit of the Control Register (CR
i
).
Timing resolution is one count of the free running
counter: (
f
CPU/(CC1.CC0)
).
Procedure
To use the input capture function select the
following in the CR2 register:
– Select the timer clock (CC1-CC0) (see
Table 15
Clock Control Bits
).
– Select the edge of the active transition on the
ICAP2 pin with the IEDG2 bit.
And select the following in the CR1 register:
– Set the ICIE bit to generate an interrupt after an
input capture.
– Select the edge of the active transition on the
ICAP1 pin with the IEDG1 bit.
When an input capture occurs:
– ICF
i
bit is set.
– The IC
i
R register contains the value of the free
running counter on the active transition on the
ICAP
i
pin (see
Figure 32
).
– A timer interrupt is generated if the ICIE bit is set
and the I bit is cleared in the CC register. Other-
wise, the interrupt remains pending until both
conditions become true.
Clearing the Input Capture interrupt request is
done by:
1. Reading the SR register while the ICF
i
bit is set.
2. An access (read or write) to the IC
i
LR
register.
After reading the IC
i
HR register, transfer of input
capture data is inhibited until the IC
i
LR register is
also read.
The IC
i
R register always contains the free running
counter value which corresponds to the most
recent input capture.
MS Byte
ICiHR
LS Byte
ICiLR
ICiR
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