The working modes of the microcontroller I/O port are basically divided into the following categories:
1. Quasi-bidirectional IO port configuration (weak pull-up)
summary:
Strong current sinking capab
Share a DSP C language IIR filter microcontroller source code as follows: #include
#include
#include "fdacoefs.h" //************************************************* //fs=1000000,fpass=10000,fstop=500