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      參數(shù)資料
      型號: PIC16C72-04E/SS
      廠商: Microchip Technology
      文件頁數(shù): 73/114頁
      文件大?。?/td> 0K
      描述: IC MCU OTP 2KX14 A/D PWM 28SSOP
      標(biāo)準(zhǔn)包裝: 47
      系列: PIC® 16C
      核心處理器: PIC
      芯體尺寸: 8-位
      速度: 4MHz
      連通性: I²C,SPI
      外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
      輸入/輸出數(shù): 22
      程序存儲器容量: 3.5KB(2K x 14)
      程序存儲器類型: OTP
      RAM 容量: 128 x 8
      電壓 - 電源 (Vcc/Vdd): 4 V ~ 6 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-SSOP(0.209",5.30mm 寬)
      包裝: 管件
      配用: 309-1025-ND - ADAPTER 28-SSOP TO 28-DIP
      1997 Microchip Technology Inc.
      DS30390E-page 61
      PIC16C7X
      7.2
      Using Timer0 with an External Clock
      When an external clock input is used for Timer0, it must
      meet certain requirements. The requirements ensure
      the external clock can be synchronized with the internal
      phase clock (TOSC). Also, there is a delay in the actual
      incrementing of Timer0 after synchronization.
      7.2.1
      EXTERNAL CLOCK SYNCHRONIZATION
      When no prescaler is used, the external clock input is
      the same as the prescaler output. The synchronization
      of T0CKI with the internal phase clocks is accom-
      plished by sampling the prescaler output on the Q2 and
      Q4 cycles of the internal phase clocks (Figure 7-5).
      Therefore, it is necessary for T0CKI to be high for at
      least 2Tosc (and a small RC delay of 20 ns) and low for
      at least 2Tosc (and a small RC delay of 20 ns). Refer to
      the electrical specication of the desired device.
      Applicable Devices
      72 73 73A 74 74A 76 77
      When a prescaler is used, the external clock input is
      divided by the asynchronous ripple-counter type pres-
      caler so that the prescaler output is symmetrical. For
      the external clock to meet the sampling requirement,
      the ripple-counter must be taken into account. There-
      fore, it is necessary for T0CKI to have a period of at
      least 4Tosc (and a small RC delay of 40 ns) divided by
      the prescaler value. The only requirement on T0CKI
      high and low time is that they do not violate the mini-
      mum pulse width requirement of 10 ns. Refer to param-
      eters 40, 41 and 42 in the electrical specication of the
      desired device.
      7.2.2
      TMR0 INCREMENT DELAY
      Since the prescaler output is synchronized with the
      internal clocks, there is a small delay from the time the
      external clock edge occurs to the time the Timer0 mod-
      ule is actually incremented. Figure 7-5 shows the delay
      from the external clock edge to the timer incrementing.
      FIGURE 7-5:
      TIMER0 TIMING WITH EXTERNAL CLOCK
      Q1
      Q2 Q3 Q4
      Q1 Q2 Q3 Q4
      External Clock Input or
      Prescaler output (2)
      External Clock/Prescaler
      Output after sampling
      Increment Timer0 (Q4)
      Timer0
      T0
      T0 + 1
      T0 + 2
      Small pulse
      misses sampling
      Note 1: Delay from clock input change to Timer0 increment is 3Tosc to 7Tosc. (Duration of Q = Tosc).
      Therefore, the error in measuring the interval between two edges on Timer0 input =
      ±4Tosc max.
      2: External clock if no prescaler selected, Prescaler output otherwise.
      3: The arrows indicate the points in time where sampling occurs.
      (3)
      (1)
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      PIC16C72-04I/SO 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
      PIC16C72-04I/SP 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
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      PIC16C72-04SP 制造商:Microchip Technology Inc 功能描述:
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