參數(shù)資料
型號： ST7FLIT19BF1U6TR
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, QCC20
封裝： LEAD FREE, QFN-20
文件頁數(shù)： 115/153頁
文件大?。?/td> 2862K
代理商： ST7FLIT19BF1U6TR
ST7LITE1xB
64/153
DUAL 12-BIT AUTORELOAD TIMER 4 (Cont’d)
■ Long Input Capture
Pulses that last more than 8
s can be measured
with an accuracy of 4
s if f
OSC = 8MHz in the fol-
lowing conditions:
– The 12-bit AT4 Timer is clocked by the Lite Timer
(RTC pulse: CK[1:0] = 01 in the ATCSR register)
– The ICS bit in the ATCSR2 register is set so that
the LTIC pin is used to trigger the AT4 Timer cap-
ture.
– The signal to be captured is connected to LTIC
pin
– Input Capture registers LTICR, ATICRH and
ATICRL are read
This configuration allows to cascade the Lite Timer
and the 12-bit AT4 Timer to get a 20-bit input cap-
ture value. Refer to Figure 44.
Figure 44. Long Range Input Capture Block Diagram
Notes:
1. Since the input capture flags (ICF) for both tim-
ers (AT4 Timer and LT Timer) are set when signal
transition occurs, software must mask one inter-
rupt by clearing the corresponding ICIE bit before
setting the ICS bit.
2. If the ICS bit changes (from 0 to 1 or from 1 to
0), a spurious transition might occur on the input
capture signal because of different values on LTIC
and ATIC. To avoid this situation, it is recommend-
ed to do as follows:
– First, reset both ICIE bits.
– Then set the ICS bit.
– Reset both ICF bits.
– And then set the ICIE bit of desired interrupt.
3. How to compute a pulse length with long input
capture feature.
As both timers are used, computing a pulse length
is not straight-forward. The procedure is as fol-
lows:
– At the first input capture on the rising edge of the
pulse, we assume that values in the registers are
as follows:
LTICR = LT1
ATICRH = ATH1
ATICRL = ATL1
Hence ATICR1 [11:0] = ATH1 & ATL1
LTIC
ATIC
ICS
1
0
12-bit Input Capture Register
OFF
fcpu
fLTIMER
12-bit Upcounter1
12-bit AutoReload Register
8-bit Input Capture Register
8-bit Timebase Counter1
fOSC/32
LTICR
CNTR1
ATICR
ATR1
8 LSB bits
12 MSB bits
LITE TIMER
12-Bit ARTIMER
20
cascaded
bits
32MHz
1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST7FLIT19BU6TR 功能描述:8位微控制器 -MCU 8 BITS MICROCONTR 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(fēng)格:SMD/SMT
ST7FLIT19BY0B6 功能描述:8位微控制器 -MCU ST7LITE1xB 8B MCU 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(fēng)格:SMD/SMT
ST7FLIT19BY0BX 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, 5 TIMERS, SPI
ST7FLIT19BY0M6 功能描述:8位微控制器 -MCU ST7LITE1xB 8B MCU 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(fēng)格:SMD/SMT
ST7FLIT19BY0MX 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, 5 TIMERS, SPI
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