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參數(shù)資料
| 型號： | ST72124J2B7 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| 中文描述： | 8位單電壓閃存，ADC和16位定時器，SPI和脊髓損傷界面微控制器 |
| 文件頁數(shù)： | 57/125頁 |
| 文件大?。?/td> | 776K |
| 代理商： | ST72124J2B7 |
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ST72334J/N, ST72314J/N, ST72124J
57/125
16-BIT TIMER
(Cont’d)
6.4.3.3 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 run-
ning counter after a transition detected by the
ICAPi pin (see figure 5).
ICi register is a read-only register.
The active transition is software programmable
through theIEDGibit oftheControlRegister (CRi).
Timing resolution is one count of the free running
counter: (
f
CPU
/(CC1.CC0)
).
Procedure:
To use the input capturefunction select the follow-
ing in the CR2 register:
– Select the timer clock (CC1-CC0) (see Table 14
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 both the ICAP1 pin or
the ICAP2 pin
– Select the edge of the active transition on the
ICAP1 pin with theIEDG1 bit(the ICAP1pin must
be configured as floating input).
When an input capture occurs:
– ICFi bit is set.
– The ICiR register contains the value of the free
running counter on the active transition on the
ICAPi 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 is
done in two steps:
1. Reading the SRregister while the ICFi bit is set.
2. An access (read or write) to the ICiLR register.
Notes:
2. After reading the ICiHR register, transfer of
input capture data is inhibited until the ICiLR
register is also read.
3. The ICiR register always contains the free run-
ning counter value which corresponds to the
most recent input capture.
4. The 2 input capture functions can be used
together even if the timer also uses the output
compare mode.
5. In One pulse Mode and PWM mode only the
input capture 2 can be used.
6. The alternate inputs (ICAP1 & ICAP2) are
always directly connected to the timer. So any
transitions on these pins activate the input cap-
ture process.
7. Moreover if one of the ICAPi 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.
8. The TOF bit can be used with interrupt in order
to measure event that go beyond the timer
range (FFFFh).
MS Byte
ICiHR
LS Byte
ICiLR
ICiR
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST72124J2B7/XXX | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72124J2T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72124J2T1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72124J2T1/XXX | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72124J2T3 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
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