P80CL580 datasheet(21/80 Pages) PHILIPS

21 / 80 page

1997 Mar 14

Philips Semiconductors

Product speciﬁcation

Low voltage 8-bit microcontrollers with

UART, I2C-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 (fPWM) at the PWM0 output is

given by:

For fosc = 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

value.

The PWM0 output pin is driven by push-pull drivers and is

not shared with any other function.

PWM

osc

{

(

PWMP

) 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

76543210

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.

76543210

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

PWM0

()

255

PWM0

()

–

{}

--------------------------------------------------

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