Chapter 3 Operation; Operating Modes; Evb Mode; Jump-Eeprom Mode - Motorola M68EVB912B32 User Manual

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The EVB can operate in one of four jumper-selectable modes:

EVB mode  either D-Bug12 or the user code in Flash EEPROM executes.

JUMP-EEPROM mode  user code in byte-erasable EEPROM executes.

POD mode  D-Bug12 executes. EVB serves as the BDM probe for a target system.

BOOTLOAD mode  the host EVB's EEPROM may be reprogrammed.

The operating mode is determined by jumper headers W3 and W4, as shown in Table 4-1. The

modes are described in the following three sections.

When operating in EVB mode, the M68EVB912B32 cannot fully

emulate a target system. The limitations are described in 3.9

Operational Limitations.

Target system emulation may, however, be performed by using the

EVB with D-Bug12 as an intelligent, non-intrusive BDM interface.

This operation is described in 3.1.3 POD (Probe) Mode.

In the default EVB mode (W3-0 and W4-0), D-Bug12 begins execution immediately. The

D-Bug12 prompt appears on the terminal and commands may be entered as described in 3.5

Using D-Bug12 Commands.

If D-Bug12 has been replaced with user code in Flash EEPROM, execution begins with the

user's program.

In this mode (W3-1 and W4-0), the EVB begins operation out of reset by executing the user

program in byte-erasable EEPROM starting at address $0D00, as shown in Table 3-5.

68EVB912B32UM/D

CHAPTER 3

OPERATION

NOTE

OPERATION

3-1

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