ES_LPC435X_3X_2X_1X

All information provided in this document is subject to legal disclaimers.

© NXP B.V. 2012. All rights reserved.

Errata sheet

Rev. 2 — 20 October 2012

6 of 11

NXP Semiconductors

ES_LPC435x/3x/2x/1x

Errata sheet LPC435x/3x/2x/1x

3.3 MCPWM.1: MCPWM Abort pin is not functional

Introduction:

The Motor Control PWM engine is optimized for three-phase AC and DC motor control

applications, but can be used in many other applications that need timing, counting,

capture, and comparison. The MCPWM contains a global Abort input that can force all of

the channels into a passive state and cause an interrupt.

Problem:

The MCPWM Abort input is not functional.

Work-around:

The MCPWM Abort function can be emulated in software with the use of a non-maskable

interrupt combined with an interrupt handler that shuts down the PWM. This will result in a

small delay on the order of 50 main clock cycles or about 1/3 of a microsecond at

150 MHz. Alternatively, the State Configurable Timer (SCT) can be configured to

implement MCPWM functionality including an Abort input. The SCT can respond to

external inputs in one clock cycle.