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| 型号： | P8xCL580HFT |
| 厂商： | NXP Semiconductors N.V. |
| 英文描述： | Low voltage 8-bit microcontrollers with UART, I2C-bus and ADC |
| 中文描述： | 低电压8 - UART的，位微控制器的I2C总线和ADC |
| 文件页数： | 21/80页 |
| 文件大小： | 366K |
| 代理商： | P8XCL580HFT |
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1997 Mar 14
21
Philips Semiconductors
Product specification
Low voltage 8-bit microcontrollers with
UART, I
2
C-bus and ADC
P80CL580; P83CL580
12 PULSE WIDTH MODULATED OUTPUT
One Pulse Width Modulated output channel (PWM0) is
provided which outputs pulses of programmable length
and interval. The repetition frequency is defined by an 8-bit
prescaler (PWMP) that generates the clock for the
counter. The 8-bit counter counts modulo 255, i.e. from
0 to 254 inclusive. The value held in the 8-bit counter is
compared to the contents of the register PWM0.
Provided the contents of this register are greater than the
counter value, the PWM0 output is set LOW. If the
contents of register PWM0 are equal to, or less than the
counter value, the PWM0 output is set HIGH.
The pulse-width-ratio is therefore defined by the contents
of register PWM0. The pulse-width-ratio will be in the
range 0 to
255
255
and may be programmed in increments
of
1
255
.
The repetition frequency (f
PWM
) at the PWM0 output is
given by:
f
2
{
1
(
PWMP
)
+
×
For f
osc
= 12 MHz the above formula gives a repetition
frequency range of 92 Hz to 23.5 kHz.
By loading the PWM0 register with either 00H or FFH, the
PWM0 output can be retained at a constant HIGH or LOW
level respectively. When loading FFH into the PWM0
register, the 8-bit counter will never actually reach this
value.
The PWM0 output pin is driven by push-pull drivers and is
not shared with any other function.
f
PWM
255
}
×
----------------------------------------------------------------------------
=
12.1
Prescaler Frequency Control Register (PWMP)
Table 5
Prescaler Frequency Control Register (address FEH)
Table 6
Description of PWMP bits
12.2
Pulse Width Register (PWM0)
Table 7
Pulse Width Register (address FCH)
Table 8
Description of PWM0 bits
7
6
5
4
3
2
1
0
PWMP.7
PWMP.6
PWMP.5
PWMP.4
PWMP.3
PWMP.2
PWMP.1
PWMP.0
BIT
SYMBOL
DESCRIPTION
7 to 1
PWMP.7 to PWMP.0
Prescaler division factor = (PWMP) + 1.
7
6
5
4
3
2
1
0
PWM0.7
PWM0.6
PWM0.5
PWM0.4
PWM0.3
PWM0.2
PWM0.1
PWM0.0
BIT
SYMBOL
DESCRIPTION
7 to 1
PWM0.7 to PWM0.0
LOW/HIGH ratio of PWM0 signal
)
}
---255
=
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