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| 型号： | ST72511R9T3/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64 |
| 封装： | 14 X 14 MM, TQFP-64 |
| 文件页数： | 127/164页 |
| 文件大小： | 1043K |
| 代理商： | ST72511R9T3/XXX |
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ST72311R, ST72511R, ST72512R, ST72532R
65/164
16-BIT TIMER (Cont’d)
10.4.3.3 Input Capture
In this section, the index,
i, may be 1 or 2 because
there are 2 input capture functions in the 16-bit
timer.
The two input capture 16-bit registers (IC1R and
IC2R) are used to latch the value of the free run-
ning counter after a transition detected by the
ICAP
i pin (see figure 5).
IC
iR register is a read-only register.
The active transition is software programmable
through the IEDG
i bit of Control Registers (CRi).
Timing resolution is one count of the free running
counter: (
fCPU/CC[1:0]).
Procedure:
To use the input capture function select the follow-
ing in the CR2 register:
– Select the timer clock (CC[1:0]) (see Table 18
Clock Control Bits).
– Select the edge of the active transition on the
ICAP2 pin with the IEDG2 bit (the ICAP2 pin
must be configured as floating input).
And select the following in the CR1 register:
– Set the ICIE bit to generate an interrupt after an
input capture coming from either the ICAP1 pin
or the ICAP2 pin
– Select the edge of the active transition on the
ICAP1 pin with the IEDG1 bit (the ICAP1pin must
be configured as floating input).
When an input capture occurs:
– ICF
i bit is set.
– The IC
iR register contains the value of the free
running counter on the active transition on the
ICAP
i pin (see Figure 40).
– 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 (i.e.
clearing the ICF
i bit) is done in two steps:
1. Reading the SR register while the ICF
i bit is set.
2. An access (read or write) to the IC
iLR register.
Notes:
1. After reading the IC
iHR register, transfer of
input capture data is inhibited and ICF
i will
never be set until the IC
iLR register is also
read.
2. The IC
iR register contains the free running
counter value which corresponds to the most
recent input capture.
3. The 2 input capture functions can be used
together even if the timer also uses the 2 output
compare functions.
4. In One pulse Mode and PWM mode only the
input capture 2 can be used.
5. The alternate inputs (ICAP1 & ICAP2) are
always directly connected to the timer. So any
transitions on these pins activate the input cap-
ture function.
Moreover if one of the ICAP
i pin is configured
as an input and the second one as an output,
an interrupt can be generated if the user toggle
the output pin and if the ICIE bit is set.
This can be avoided if the input capture func-
tion
i is disabled by reading the ICiHR (see note
1).
6. The TOF bit can be used with interrupt in order
to measure event that go beyond the timer
range (FFFFh).
MS Byte
LS Byte
ICiR
IC
iHR
IC
iLR
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