SYSTEM TO ACQUIRE ANALOG TO DIGITAL (ADC) DATA USING HIGH END TIMER (N2HET) AND HIGH END TIMER TRANSFER UNIT (HTU)

摘要

A method of converting and acquiring external analog data without central processing unit (CPU) intervention using high-end timer unit (N2HET) and High End Timer Transfer Unit (HTU) to overcome serial peripheral interface (SPI) and external memory interface (EMIF) limitations encountered while performing high speed transfers. The method includes connecting a conversion start pin, a chip select (CS) pin, a read enable pin, a converter busy pin and data pins of an analog to digital converter (ADC) with the pins of the N2HET. The N2HET is configured to perform ADC data conversion and acquisition by performing steps of: activating a conversion start signal on the CS pin until a deactivation of the converter busy pin; and generating an HTU request to transfer data from a data N2HET pin to a N2HET random access memory (RAM) unit via a data transfer channel and then from N2HET RAM to RAM of the CPU.