The PIC17C4X high end microcontroller family, offered by Microchip, has many features which make it one of the fastest 8-bit microcontrollers in the industry. How-ever one feature which is missing is an on-chip Ana-log-to-Digital (A/D) converter. This Technical Brief describes how to connect a PIC16C710 to a PIC17C4X through a simple Serial I/O (SIO) 3 line interface. The result is a quick method by which a user can get a fast (approx. 17 kHz transfer rate) 4-channel A/D converter TB010 Adding a Simple 4-channel 8-bit A/D to a PIC17C4X IMPLEMENTATION Author: Stan D’Souza Microchip Technology Inc. The PIC17C4X is the master device in this case, oper- ating at 16 MHz . The master generates the CLK pulse and initiates the conversion. The PIC16C710 is the INTRODUCTION slave, operating at 20 MHz, and provides the ……