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參數資料
| 型號： | MC68HC705C9ACFB |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | QFP-44 |
| 文件頁數： | 67/118頁 |
| 文件大小： | 750K |
| 代理商： | MC68HC705C9ACFB |
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Capture/Compare Timer
MC68HC05C9A Advance Information Data Sheet, Rev. 4.1
52
Freescale Semiconductor
8.2 Timer Operation
The core of the capture/compare timer is a 16-bit free-running counter. The counter provides the timing
reference for the input capture and output compare functions. The input capture and output compare
functions provide a means to latch the times at which external events occur, to measure input waveforms,
and to generate output waveforms and timing delays. Software can read the value in the 16-bit
free-running counter at any time without affecting the counter sequence.
Because of the 16-bit timer architecture, the I/O registers for the input capture and output compare
functions are pairs of 8-bit registers.
Because the counter is 16 bits long and preceded by a fixed divide-by-4 prescaler, the counter rolls over
every 262,144 internal clock cycles. Timer resolution with a 4-MHz crystal is 2
s.
8.2.1 Input Capture
The input capture function is a means to record the time at which an external event occurs. When the
input capture circuitry detects an active edge on the TCAP pin, it latches the contents of the timer registers
into the input capture registers. The polarity of the active edge is programmable.
Latching values into the input capture registers at successive edges of the same polarity measures the
period of the input signal on the TCAP pin. Latching values into the input capture registers at successive
edges of opposite polarity measures the pulse width of the signal.
8.2.2 Output Compare
The output compare function is a means of generating an output signal when the 16-bit counter reaches
a selected value. Software writes the selected value into the output compare registers. On every fourth
internal clock cycle the output compare circuitry compares the value of the counter to the value written in
the output compare registers. When a match occurs, the timer transfers the programmable output level
bit (OLVL) from the timer control register to the TCMP pin.
The programmer can use the output compare register to measure time periods, to generate timing delays,
or to generate a pulse of specific duration or a pulse train of specific frequency and duty cycle on the
TCMP pin.
8.3 Timer I/O Registers
The following I/O registers control and monitor timer operation:
Timer control register (TCR)
Timer status register (TSR)
Timer registers (TRH and TRL)
Alternate timer registers (ATRH and ATRL)
Input capture registers (ICRH and ICRL)
Output compare registers (OCRH and OCRL)
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相關代理商/技術參數 |
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| MC68HC705C9ACFBE | 功能描述:8位微控制器 -MCU 8B MCU 352 BYTES RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 |
| MC68HC705C9ACFN | 功能描述:IC MCU 2.1MHZ 16K OTP 44-PLCC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有關文件:STM32F101T8 View All Specifications 特色產品:STM32 32-bit Cortex MCUs 標準包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數:26 程序存儲器容量:64KB（64K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數據轉換器:A/D 10x12b 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND |
| MC68HC705C9ACFNE | 功能描述:8位微控制器 -MCU 8B MCU 352 BYTES RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 |
| MC68HC705C9ACP | 功能描述:IC MCU 2.1MHZ 16K OTP 40-DIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC05 其它有關文件:STM32F101T8 View All Specifications 特色產品:STM32 32-bit Cortex MCUs 標準包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數:26 程序存儲器容量:64KB（64K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數據轉換器:A/D 10x12b 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND |
| MC68HC705C9ACPE | 制造商:Freescale Semiconductor 功能描述: |
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