3.13. PTM external outputs

The number of external inputs implemented by a PTM is implementation defined, between zero and four. You can use PTM events to control any implemented external outputs. For each implemented external output, the PTM implements an External Output Event Register. See External Output Event Registers, ETMEXTOUTEVRn.

Read bits [22:20] of the Configuration Code Register to find the number of implemented external outputs. This field reads-as-zero if the PTM does not implement any external outputs.

To use a PTM external output you program the associated External Output Event Register to define the event that drives the output. Then, when the event is TRUE, the output is driven HIGH.

When the Programming bit is set to 1, the external outputs are forced LOW.

Copyright © 1999-2002, 2004-2008, 2011 ARM. All rights reserved.ARM IHI 0035B