ETM Main Control Register
| ETMPD | ETM Power Down  |  
| PORTSIZE | Port Size bits 2:0  |  
| STALL | Stall Processor  |  
| BROUT | Branch Output  |  
| DBGRQ | Debug Request Control  |  
| PROG | ETM Programming  |  
| PORTSEL | ETM Port Select  |  
| PORTMODE2 | Port Mode bit 2  |  
| PORTMODE | Port Mode bits 1:0  |  
| PORTSIZE3 | Port Size bit 3  |  
| TSEN | TimeStamp Enable  |