DS2250(T)

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A typical parallel loading session would follow this procedure. First, set the contents of the MCON

register with the correct range and partition only if using expanded programming cycles. Next, the

encryption registers can be loaded to enable encryption of the program/data memory (not required). Then,

program the DS2250(T) using either normal or expanded program cycles and check the memory contents

using Verify cycles. The last operation would be to turn on the security lock feature by either a Security

Set cycle or by explicitly writing to the MCON register and setting MCON.0 to a 1.

SERIAL LOADER BAUD RATES FOR

DIFFERENT CRYSTAL FREQUENCIES Table 2

BAUD RATE

CRYSTAL FREQ

(MHz)

300

1200

2400

9600

19200

57600

14.7456

Y

Y

Y

Y

11.0592

Y

Y

Y

Y

Y

Y

9.21600

Y

Y

Y

Y

7.37280

Y

Y

Y

Y

5.52960

Y

Y

Y

Y

1.84320

Y

Y

Y

Y

ADDITIONAL INFORMATION

A complete description for all operational aspects of the DS2250(T) is provided in the User’s Guide

section of the Secure Microcontroller Data Book.

DEVELOPMENT SUPPORT

Dallas Semiconductor offers a kit package for developing and testing user code. The DS5000TK

Evaluation Kit allows the user to download Intel hex formatted code directly to the DS2250(T) from a

PC-XT/AT or compatible computer. The kit consists of a DS5000T-32-12, an interface pod, demo

software, and an RS232 connector that attaches to the COM1 or COM2 serial port of a PC. The kit can be

used with a DS2250(T). A mechanical adapter, the DS9075-40V, allows a DS2250(T) to be used in the

DS5000TK. See the Secure microcontroller User’s Guide for further details.