MAC7200 datasheet(230/976 Pages) FREESCALE

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A7S Nexus3 Programmers Model

MAC7200 Microcontroller Family Reference Manual, Rev. 2

152

Freescale Semiconductor

11.10.3.3 Development Status (DS)

The Development Status Register is used to report system debug status. When Debug Mode is entered or

exited or an SoC or ARM7 defined Low Power Mode is entered (see Note below), a Debug Status Message

is transmitted with DS[31:24]. The external tool can read this register at any time.

Table 11-23. DC Field Descriptions

Field

Description

31–29

Reserved for future functionality (read as 0)

28–27

EOC

EVTO Control

00 EVTO upon occurrence of Watchpoint

01 EVTO upon entry into Debug Mode (DBGACK)

1X Reserved

Reserved for future functionality (read as 0)

PTM

Program Trace Method (Thumb mode only)

0 Program Trace in Thumb mode uses Branch History Messages

1 Program Trace in Thumb mode uses traditional Branch Messages

WEN

Watchpoint Trace Enable

0 Watchpoint Messaging disabled

1 Watchpoint Messaging enabled

23–8

Reserved for future functionality (read as 0)

7–5

OVC

Overrun Control

000 Generate overrun messages

001 Reserved

010 Reserved

011 Delay processor for trace message overruns (FIFOFULL)

1xx Reserved

4–3

EIC

EVTI Control

00 EVTI for synchronization (Program Trace)

01 EVTI for Debug request (if implemented)

10 EVTI disabled

11 Reserved

2–0

Trace Mode

000 No Trace

1xx Program Trace enabled

x1x Data Trace enabled

xx1 Ownership Trace enabled

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