P89LPC932A1FDH View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

P89LPC932A1FDH

8-bit microcontroller with accelerated two-clock 80C51 core 8 kB 3 V byte-erasable flash with 512-byte data EEPROM

NXP Semiconductors. 

NXP Semiconductors

P89LPC932A1

8-bit microcontroller with accelerated two-clock 80C51 core

7.19.6 PWM operation

PWM operation has two main modes, symmetrical and asymmetrical.

In asymmetrical PWM operation the CCU Timer operates in down-counting mode

regardless of the direction control bit.

In symmetrical mode, the timer counts up/down alternately. The main difference from

basic timer operation is the operation of the compare module, which in PWM mode is

used for PWM waveform generation.

As with basic timer operation, when the PWM (compare) pins are connected to the

compare logic, their logic state remains unchanged. However, since bit FCO is used to

hold the halt value, only a compare event can change the state of the pin.

TOR2

compare value

timer value

0x0000

non-inverted

inverted

Fig 9. Asymmetrical PWM, down-counting

002aaa893

TOR2

compare value

timer value

0

non-inverted

inverted

Fig 10. Symmetrical PWM

002aaa894

P89LPC932A1_3

Product data sheet

Rev. 03 — 12 March 2007

© NXP B.V. 2007. All rights reserved.

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