For applications not requiring fast conversion,a single circuit that can performboth conversions proves adequate. Onesuch circuit (Figure 1 ) utilizes up/downcounters to obtain the desired results.

Microcontroller firmware usuallydeals with hexadecimal code. Yousometimes need to display the contentof registers, which requires a hexadecimal-to-BCD (binary-coded-decimal)-code conversion. The ...