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| 型號(hào)： | ADUC832BS |
| 廠(chǎng)商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | MicroConverter, 12-Bit ADCs and DACs with Embedded 62 kBytes Flash MCU |
| 中文描述： | 8-BIT, FLASH, 16.78 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | PLASTIC, MQFP-52 |
| 文件頁(yè)數(shù)： | 37/80頁(yè) |
| 文件大?。?/td> | 1311K |
| 代理商： | ADUC832BS |
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REV. 0
ADuC832
–37–
PWM MODES OF OPERATION
MODE 0: PWM Disabled
The PWM is disabled allowing P2.6 and P2.7 to be used
as normal.
MODE 1: Single Variable Resolution PWM
In Mode 1, both the pulse length and the cycle time (period) are
programmable in user code, allowing the resolution of the PWM
to be variable.
PWM1H/L sets the period of the output waveform. Reducing
PWM1H/L reduces the resolution of the PWM output but
increases the maximum output rate of the PWM. (e.g., setting
PWM1H/L to 65536 gives a 16-bit PWM with a maximum
output rate of 266 Hz (16.777MHz/65536). Setting PWM1H/L
to 4096 gives a 12-bit PWM with a maximum output rate of
4096 Hz (16.777MHz/4096)).
PWM0H/L sets the duty cycle of the PWM output waveform, as
shown in Figure 27.
P2.7
PWM COUNTER
PWM1H/L
0
PWM0H/L
Figure 27. ADuC832 PWM in Mode 1
MODE 2: Twin 8-Bit PWM
In Mode 2, the duty cycle of the PWM outputs and the resolution
of the PWM outputs are both programmable. The maximum
resolution of the PWM output is eight bits.
PWM1L sets the period for both PWM outputs. Typically, this
will be set to 255 (FFH) to give an 8-bit PWM although it is pos-
sible to reduce this as necessary. A value of 100 could be loaded
here to give a percentage PWM (i.e., the PWM is accurate to 1%).
The outputs of the PWM at P2.6 and P2.7 are shown in Figure 28.
As can be seen, the output of PWM0 (P2.6) goes low when the
PWM counter equals PWM0L. The output of PWM1 (P2.7) goes
high when the PWM counter equals PWM1H and goes low
again when the PWM counter equals PWM0H. Setting PWM1H
to 0 ensures that both PWM outputs start simultaneously.
P2.7
P2.6
PWM COUNTER
PWM1H
0
PWM1L
PWM0H
PWM0L
Figure 28. PWM Mode 2
MODE 3: Twin 16-Bit PWM
In Mode 3, the PWM counter is fixed to count from 0 to 65536,
giving a fixed 16-bit PWM. Operating from the 16.777 MHz
core clock results in a PWM output rate of 256 Hz. The duty
cycle of the PWM outputs at P2.6 and P2.7 is independently
programmable.
As shown in Figure 29, while the PWM counter is less than
PWM0H/L, the output of PWM0 (P2.6) is high. Once the PWM
counter equals PWM0H/L, PWM0 (P2.6) goes low and remains
low until the PWM counter rolls over.
Similarly, while the PWM counter is less than PWM1H/L, the
output of PWM1 (P2.7) is high. Once the PWM counter equals
PWM1H/L, PWM1 (P2.7) goes low and remains low until the
PWM counter rolls over.
In this mode, both PWM outputs are synchronized, i.e., once the
PWM counter rolls over to 0, both PWM0 (P2.6) and PWM1
(P2.7) will go high.
P2.7
P2.6
PWM COUNTER
PWM1H/L
0
65536
PWM0H/L
Figure 29. PWM Mode 3
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