The PIC16C73B is a member of the PIC16C63A/65B/73B/74B family of microcontrollers. This datasheet details anomalies related to the oscillator start-up timer and TMR1 register operation, along with clarifications and corrections to the original data sheet. It also introduces a new 28-pin QFN package option. Applications include general-purpose control, data acquisition, and communication systems.