Engineering Bulletin

EB311

2

MOTOROLA

Using Monitor Mode for FLASH Programming

Motorola’s current solution for ICP is the in-circuit simulators and P&E’s

software.

The software and ICS allow programming of the parts on the simulator

or in the target circuit via a MON08 ribbon cable. The software also

allows programming of the part, without the ICS, by using an external

communications circuit.

All the programming described here is accomplished by placing the part

into monitor mode. In this mode, erasing and programming are done

through a single-wire interface with the host computer.

The two ways to enter monitor mode are:

•

The ICS provides the entry requirements into standard monitor

mode. These entry requirements must be implemented on the

target board if the ICS is not used.

•

A second way to enter monitor mode, that does not require a high

voltage on the IRQ1 pin, is forced monitor mode. This mode does

not need to meet all the monitor mode entry conditions of the

standard monitor mode, but it does require the part to be blank

(erased).

This engineering bulletin describes how to connect the part,

communicate at different baud rates, place the part into monitor mode,

pass security, and erase and program the part. If the security code is not

known, the contents of the FLASH can’t be read, but the FLASH can be

erased and reprogrammed.

Information on the M68ICS08SR can be found at

http://www.motorola.com/semiconductors, the company’s Web site.

P&E Microcomputer Systems software can be downloaded free from

that company’s Web site.

NOTE:

All of the oscillators used in this engineering bulletin are the 4-pin

“powered” or “canned” type oscillators. Discussing all the different

vendors of crystals, ceramic oscillators, other required external

components, and component layout variables would be too extensive.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com