参数资料
型号: PIC16C715T-20I/SS
厂商: Microchip Technology
文件页数: 76/177页
文件大小: 0K
描述: IC MCU OTP 2KX14 A/D 20SSOP
产品培训模块: Asynchronous Stimulus
标准包装: 1,600
系列: PIC® 16C
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
外围设备: 欠压检测/复位,POR,WDT
输入/输出数: 13
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: OTP
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 5.5 V
数据转换器: A/D 4x8b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 20-SSOP(0.209",5.30mm 宽)
包装: 带卷 (TR)
配用: 309-1016-ND - ADAPTER 20-SSOP TO 18-DIP
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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