參數(shù)資料
型號: PIC16C71-04I/P
廠商: Microchip Technology
文件頁數(shù): 76/177頁
文件大小: 0K
描述: IC MCU OTP 1KX14 A/D 18DIP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 25
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 4MHz
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 13
程序存儲器容量: 1.75KB(1K x 14)
程序存儲器類型: OTP
RAM 容量: 36 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 4x8b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 18-DIP(0.300",7.62mm)
包裝: 管件
配用: ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
309-1059-ND - ADAPTER 18 ZIF BD W/18SO PLUGS
DVA16XP180-ND - ADAPTER DEVICE FOR MPLAB-ICE
AC164010-ND - MODULE SKT PROMATEII DIP/SOIC
167
7593L–AVR–09/12
AT90USB64/128
When the modulator is enabled the type of modulation (logical AND or OR) can be selected by
the PORTB7 Register. Note that the DDRB7 controls the direction of the port independent of the
COMnx1:0 bit setting.
17.2.1
Timing example
Figure 17-3 illustrates the modulator in action. In this example the Timer/Counter1 is set to oper-
ate in fast PWM mode (non-inverted) and Timer/Counter0 uses CTC waveform mode with toggle
Compare Output mode (COMnx1:0 = 1).
Figure 17-3. Output Compare Modulator, timing diagram.
In this example, Timer/Counter2 provides the carrier, while the modulating signal is generated
by the Output Compare unit C of the Timer/Counter1.
The resolution of the PWM signal (OC1C) is reduced by the modulation. The reduction factor is
equal to the number of system clock cycles of one period of the carrier (OC0A). In this example
the resolution is reduced by a factor of two. The reason for the reduction is illustrated in Figure
17-3 at the second and third period of the PB7 output when PORTB7 equals zero. The period 2
high time is one cycle longer than the period 3 high time, but the result on the PB7 output is
equal in both periods.
1
2
OC0A
(CTC mode)
OC1C
(FPWM mode)
PB7
(PORTB7 = 0)
PB7
(PORTB7 = 1)
(Period)
3
clk
I/O
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