The PIC16C74 is one of the latest mid-range microcon-trollers from Microchip Technology Inc. In this article we will be addressing a few of the new features and peripherals of this new part. The main focus will be on the A/D (Analog-to-Digital) Converter, the SCI (Serial Communication Interface), and the PWM (Pulse Width Modulator). Our intention is to give you a small program that initializes these peripherals as well as exercises them. A schematic is provided. The PICDEM TM 2 board from Microchip will run this program. The second trim-pot does not exist on the PICDEM 2 board, so the sec-ond A/D value may float around. The second trimpot is only used to show a method of changing A/D input pins. If you are using the PICDEM 2 board, then the LED and a current limiting resistor must be connected to the PWM output. When the program is run, the RS-232 ter-minal will display two A/D values. The brightness of an LED is adjusted using pulse width modulation. The duty cycle is determined by the trimpot setting.M FACT003 Care and Feeding of the PIC16C74 and Its Peripherals A/D Converter Mysteries Author: Robert Angelo The A/D converter and its eight input channels will be Microchip Technology Inc. our first topic. Setting up the A/D converter involves two special function registers: ADCON0 The PIC16C74 is one of the latest mid-range microcon- ……