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    參數(shù)資料
    型號(hào): PIC16F72T-E/SO
    廠商: Microchip Technology
    文件頁數(shù): 111/136頁
    文件大?。?/td> 0K
    描述: IC PIC MCU FLASH 2KX14 28-SOIC
    標(biāo)準(zhǔn)包裝: 1,600
    系列: PIC® 16F
    核心處理器: PIC
    芯體尺寸: 8-位
    速度: 20MHz
    連通性: I²C,SPI
    外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
    輸入/輸出數(shù): 22
    程序存儲(chǔ)器容量: 3.5KB(2K x 14)
    程序存儲(chǔ)器類型: 閃存
    RAM 容量: 128 x 8
    電壓 - 電源 (Vcc/Vdd): 4 V ~ 5.5 V
    數(shù)據(jù)轉(zhuǎn)換器: A/D 5x8b
    振蕩器型: 外部
    工作溫度: -40°C ~ 125°C
    封裝/外殼: 28-SOIC(0.295",7.50mm 寬)
    包裝: 帶卷 (TR)
    76
    2535J–AVR–08/10
    ATtiny13
    12. Timer/Counter Prescaler
    12.1 Overview
    The Timer/Counter can be clocked directly by the system clock (by setting the CSn2:0 = 1). This
    provides the fastest operation, with a maximum Timer/Counter clock frequency equal to system
    clock frequency (fCLK_I/O). Alternatively, one of four taps from the prescaler can be used as a
    clock source. The prescaled clock has a frequency of either fCLK_I/O/8, fCLK_I/O/64, fCLK_I/O/256, or
    fCLK_I/O/1024.
    12.2 Prescaler Reset
    The prescaler is free running, i.e., operates independently of the Clock Select logic of the
    Timer/Counter. Since the prescaler is not affected by the Timer/Counter’s clock select, the state
    of the prescaler will have implications for situations where a prescaled clock is used. One exam-
    ple of prescaling artifacts occurs when the timer is enabled and clocked by the prescaler (6 >
    CSn2:0 > 1). The number of system clock cycles from when the timer is enabled to the first count
    occurs can be from 1 to N+1 system clock cycles, where N equals the prescaler divisor (8, 64,
    256, or 1024).
    It is possible to use the Prescaler Reset for synchronizing the Timer/Counter to program
    execution.
    12.3 External Clock Source
    An external clock source applied to the T0 pin can be used as Timer/Counter clock (clkT0). The
    T0 pin is sampled once every system clock cycle by the pin synchronization logic. The synchro-
    nized (sampled) signal is then passed through the edge detector. Figure 12-1 on page 76 shows
    a functional equivalent block diagram of the T0 synchronization and edge detector logic. The
    registers are clocked at the positive edge of the internal system clock (clk
    I/O). The latch is trans-
    parent in the high period of the internal system clock.
    The edge detector generates one clkT0 pulse for each positive (CSn2:0 = 7) or negative (CSn2:0
    = 6) edge it detects.
    Figure 12-1. T0 Pin Sampling
    The synchronization and edge detector logic introduces a delay of 2.5 to 3.5 system clock cycles
    from an edge has been applied to the T0 pin to the counter is updated.
    Enabling and disabling of the clock input must be done when T0 has been stable for at least one
    system clock cycle, otherwise it is a risk that a false Timer/Counter clock pulse is generated.
    Each half period of the external clock applied must be longer than one system clock cycle to
    ensure correct sampling. The external clock must be guaranteed to have less than half the sys-
    tem clock frequency (fExtClk < fclk_I/O/2) given a 50/50% duty cycle. Since the edge detector uses
    Tn_sync
    (To Clock
    Select Logic)
    Edge Detector
    Synchronization
    DQ
    LE
    DQ
    Tn
    clk
    I/O
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    PIC16F72T-I/ML 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
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