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参数资料
型号： PIC16C433T-I/SO
厂商： Microchip Technology
文件页数： 114/126页
文件大小： 0K
描述： IC MCU CMOS 8BIT 10MHZ 2K 18SOIC
标准包装： 1,100
系列： PIC® 16C
核心处理器： PIC
芯体尺寸： 8-位
速度： 10MHz
连通性： LIN（本地互连网络）
外围设备： POR，WDT
输入/输出数： 5
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)： 4.5 V ~ 5.5 V
数据转换器： A/D 4x8b
振荡器型： 内部
工作温度： -40°C ~ 85°C
封装/外壳： 18-SOIC（0.295"，7.50mm 宽）
包装： 带卷 (TR)
88
4378C–AVR–09/08
AT90PWM1
match between OCR0x and TCNT0 when the counter decrements. The PWM frequency for the
output when using phase correct PWM can be calculated by the following equation:
The N variable represents the prescale factor (1, 8, 64, 256, or 1024).
The extreme values for the OCR0A Register represent special cases when generating a PWM
waveform output in the phase correct PWM mode. If the OCR0A is set equal to BOTTOM, the
output will be continuously low and if set equal to MAX the output will be continuously high for
non-inverted PWM mode. For inverted PWM the output will have the opposite logic values.
At the very start of period 2 in Figure 14-7 OCnx has a transition from high to low even though
there is no Compare Match. The point of this transition is to guarantee symmetry around BOT-
TOM. There are two cases that give a transition without Compare Match.
OCRnx changes its value from MAX, like in Figure 14-7. When the OCR0A value is MAX the
OCn pin value is the same as the result of a down-counting Compare Match. To ensure
symmetry around BOTTOM the OCnx value at MAX must correspond to the result of an up-
counting Compare Match.
The timer starts counting from a value higher than the one in OCRnx, and for that reason
misses the Compare Match and hence the OCnx change that would have happened on the
way up.
14.7
Timer/Counter Timing Diagrams
The Timer/Counter is a synchronous design and the timer clock (clkT0) is therefore shown as a
clock enable signal in the following figures. The figures include information on when interrupt
flags are set. Figure 14-8 contains timing data for basic Timer/Counter operation. The figure
shows the count sequence close to the MAX value in all modes other than phase correct PWM
mode.
Figure 14-8. Timer/Counter Timing Diagram, no Prescaling
Figure 14-9 shows the same timing data, but with the prescaler enabled.
f
OCnxPCPW M
fclk_I/O
N 510
------------------
=
clk
Tn
(clk
I/O/1)
TOVn
clk
I/O
TCNTn
MAX - 1
MAX
BOTTOM
BOTTOM + 1
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