pcfg(1, 6, -1, INPUT | PULLDOWN, "ser");
pcfg(1, 13, 0, OUTPUT, "clk");
pcfg(1, 15, 0, OUTPUT, "shld");
pcfg(0, 27, 0, OUTPUT, "clr");
pcfg(1, 6, -1, INPUT | PULLDOWN, "ser");
pcfg(1, 13, 0, OUTPUT, "clk");
pcfg(1, 15, 0, OUTPUT, "shld");
pcfg(0, 27, 0, OUTPUT, "clr");