Analog-to-digital converter with writable result register

摘要

An analog-to-digital converter has a conversion section (14) that converts an external analog signal at port (2) to an internal digital signal (DI), a digital input port (4) that receives an external digital signal (DE), and a result register (24). A selector (18) controlled by a selection signal selects either the internal digital signal (DI) or the external digital signal (DE) for storage in the result register (24). The external digital signal (DE) can be written into the result register (24) for test purposes, or to use the result register for general-purpose data storage.