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參數(shù)資料
| 型號： | DMC73C168 |
| 英文描述： | 8Bit Single Chip Microcontroller |
| 中文描述： | 8位單芯片微控制器 |
| 文件頁數(shù)： | 68/90頁 |
| 文件大?。?/td> | 742K |
| 代理商： | DMC73C168 |
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68
8Bit Single Chip Microcontroller
DMC73C167
Figure 5-16. Timing and Polarity of 6-bit PWM1_0-PWM1_8 Output
Write BIT6 of P38 - P46
Start PWM
Stop PWM
5.9 14-bit PWM (PWM0)
5.9.1 Description of PWM0
The periodic interval T = 5.4ms (FOSC = 6MHz) can be divided into 16k minimum
pulse width T0 = 333ns (FOSC = 6MHz), and the pulse width can be modulated by
the T0 unit depending on the 14-bit data. Also, by generating a small periodic interval
Ts = 85us (FOSC = 6MHz), which is 256 x T0, pulses of almost equal width can be
output with a period of Ts. Tm (m = 1 - 64), defined as the signal duration in 64 small
intervals, is calculated as follows. First, the 14-bit data is split into two parts: the most
significant 6 bits and the least significant 8 bits. The value of the LS 8 bits determines
the interval of basic time. Hence, Tm (1 - 64) = (number indicated by 8 bits) x T0 in
the 64 small intervals. Furthermore, the 6-bit data decides how many T0s are added
one by one in the 64 intervals. The relationship between the 6-bit data and Tm is
illustrated in Figure 5-24, and the basic 14-bit PWM waveform is shown in Figure 5-25.
On Time
0
1
BIT6
Value
1 : High
On Time
1
0 : Low
0
After Reset
BIT6=0
PWM
￡￡á￡￡×￡￡
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