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DESIGN IDEAS - CMOS IC Makes Low-Cost Digital Potentiometer - Power Management In The ST62 - Automatic Power-Off Circuit Saves Battery - Simple PC Smart Card Reader Enhancement - Digital Position Encoder Does Away With ADC - Single-Supply RS-232 Transmission Without Level-Translator ICs - µC Controls Charge Pump As Background Task - Clock Multiplier Circumvents PLL - Drive Smart Cards With A Low-Cost MCU's UART - Wireless “Battery” Energizes Low-Power Devices - Harvest Energy Using A Piezoelectric Buzzer - Drive A Single-Coil Latching Relay Without An H-Bridge Circuit DESIGN CONTESTS ARTICLES
CONTACT
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MOBILE PHONE BOOK
M16C/62P-Based Data Backup System Article published in the Circuit Cellar
Magazine, Issue 190, May 2006 Carlos’s M16C/62P-based system enables you to back up your cellular phone book records on the microcontroller’s flash memory, a PC, or a SIM smart card. DESIGN INSPIRATION "Finding the time, money, and energy to complete a project can be difficult. Even when you come up with a superb idea, sometimes you just can’t follow through. Our design contests have inspired some designers to push ahead regardless of the difficulty. It’s probably a combination of the prize money at stake, the challenge, and finding the right part for the project. Whatever the reason, we’re happy that our contests can elicit the fantastic projects that come from those superb ideas. A few such projects from the Philips ARM Design Contest 2005 and the Renesas M16C Design Contest 2005 are in this month’s issue. Carlos Cossio was interested in figuring out a way to preserve his cellular phone’s phone book data in the event that he ever loses or breaks his phone (p. 12). After taking all the time to input important data, he didn’t want to risk losing it. Then he heard about the Renesas M16C Design Contest 2005. Carlos used the M16C/62P demonstration board to build a backup system for the phone book. Carlos’s Mobile Phone Book acquires the phone book data, which is stored on his phone’s GSM SIM smart card. Then, Carlos can display the data on the demonstration board’s LCD and save it in the on-board microcontroller’s flash memory. He also has the option to send the data to a PC or another SIM card for backup storage. Carlos’s well-made project won Honorable Mention in the Renesas M16C contest." Jennifer
Huber
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