Motorola M68CPU32BUG User Manual download pdf (Page 28)

MOTOROLA MC68332TUT/D

The debugger should now work reliably. That is, programs can be downloaded into the RAM and executed.

Alternatively, write the reset vector to memory location $000000. The reset vector is discussed in detail in

4.1.3.1 Initializing the Reset Vector

3.2 Communicating with Motorola Boards

Third party vendors sell many types of development tools to help establish communication with the MCU.

These tools are described in the

Motorola Microcontroller Development Tools Directory

. However, this tu-

torial focuses only on Motorola evaluation boards.

3.2.1 The M68EVK332

The M68EVK332 (A or G) is an evaluation kit that consists of two components: a platform board (PFB) and

a business card computer (BCC). The PFB has logic analyzer connectors and sockets for external memory.

The BCC is a plug-in daughter board that holds the MCU, RAM, and a boot EPROM. On older versions of

the BCC, the EPROM is soldered to the board and cannot be easily reprogrammed. However, on newer

versions of the BCC, the EPROM is socketed and can easily be removed and reprogrammed.

There are two ways to communicate with the EVK: serial communication using the ROM monitor in the

EPROM and background debug mode (BDM) using a debugger. Both are valid ways of debugging code;

however, the user interface for BDM is much more user-friendly.

3.2.1.1 Communication Using the ROM Monitor

The EPROM contains a monitor program called CPU32Bug (332Bug in older versions of the BCC).

CPU32Bug consists of both initialization code and a user interface. The initialization code sets the system

clock to 16.778 MHz, disables the software watchdog, and configures chip-selects 0, 1, and 2, which are

necessary to talk to the RAM. The user interface uses the serial communication interface (SCI) to give a

prompt on a computer screen and allow the user to modify memory, load, trace, and run programs. The

CPU32Bug Debug Monitor User’s Manual

explains more about the capabilities of CPU32Bug.

Terminal emulation programs for the Macintosh, such as MacTerminal or Red Ryder, and communications

software for the IBM-PC, such as Kermit or PROCOMM, are acceptable for use with the EVK. The

M68332EVK Evaluation Kit User’s Manual

explains the necessary steps to follow for each type of software.

This section will only explain how to use PROCOMM with the EVK.

First, assemble a cable as shown in Figure 18. The 25-pin connector goes to the serial port on the PC, and

the 9-pin connector goes to P9 (terminal from BCC) on the EVK. Connect the cable from the appropriate 9-

pin serial port on the EVK to the serial port on the PC. Then, execute the communications program. As an

example, for PROCOMM PLUS, set up PROCOMM to match the EVK baud rate and protocol as follows:

9600 baud, no parity, 8 bits, 1 stop bit, full duplex

Set up ASCII transfer parameters as follows:

Echo Local - No

Expand Blank Lines - Yes

Pace Character - 0

Character pacing - 15 (milliseconds)

Line pacing - 10

CR Translation - None

LF Translation - None

Now, apply power to the EVK and press the keyboard carriage return (<CR>) key to display the EVK monitor

prompt. If necessary, press the BCC RESET button on the EVK.

To load a program, perform the following sequence:

CPU32Bug>LO (Press <CR>)

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 55 56

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