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參數(shù)資料
| 型號： | ST72T121J4B6 |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| 中文描述： | 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存 |
| 文件頁數(shù)： | 37/93頁 |
| 文件大?。?/td> | 915K |
| 代理商： | ST72T121J4B6 |
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ST72E121 ST72T121
16-BIT TIMER
(Cont’d)
5.3.3.3 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 is detected by the
ICAP
i
pin (see figure 5).
The IC
i
R register is a read-only register.
The active transition is software programmable
through the IEDG
i
bit of Control Registers (CR
i
).
Timing resolution is one count of the free running
counter: (
f
CPU
/
CC[1:0]).
Procedure:
To use the input capture function, select the fol-
lowing in the CR2 register:
– Select the timer clock (CC[1:0]) (see
Table 14
).
– Select the edge of the active transition on the
ICAP2 pin with the IEDG2 bit (the ICAP2 pin
must be configured as a 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 a floating input).
When an input capture occurs:
– The 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 26
).
– 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
i
LR
register.
Notes:
1. After reading the IC
i
HR register, the transfer of
input capture data is inhibited and ICF
i
will
never be set until the IC
i
LR register is also
read.
2. The IC
i
R 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 function 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 tog-
gles 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 IC
i
HR (see note
1).
6. The TOF bit can be used with an interrupt in
order to measure events that exceed the timer
range (FFFFh).
MS Byte
ICiHR
LS Byte
ICiLR
ICiR
37
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| ST72T121J4T6 | 功能描述:8位微控制器 -MCU OTP EPROM 16K SPI/SC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| ST72T121J4T6S | 制造商:STMicroelectronics 功能描述: |
| ST72T141K2B6 | 功能描述:8位微控制器 -MCU OTP EPROM 8K SPI RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| ST72T141K2M6 | 功能描述:8位微控制器 -MCU OTP EPROM 8K SPI RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| ST72T212G2B6 | 功能描述:8位微控制器 -MCU OTP EPROM 8K SPI RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
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