51单片机原理图.pdf

5 5 4 4 3 3 2 2 1 1 D D C C B B A A P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 P2.0 P2.1 P2.2 P2.3 P2.4 P2.5 P2.6 P2.7 P3.0 P3.1 P3.2 P3.3 P3.4 P3.5 P3.6 P3.7 P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 RST XTAL1 XTAL2 TXD UD- UD+ RXD UD+ UD- P0.0 LED&LCD_P0.0 P0.1 LED&LCD_P0.1 P0.2 LED&LCD_P0.2 P0.3 LED&LCD_P0.3 P0.4 LED&LCD_P0.4 P0.5 LED&LCD_P0.5 P0.6 LED&LCD_P0.6 P0.7 LED&LCD_P0.7 P1.0 SEG_P1.0 P1.1 SEG_P1.1 P1.2 SEG_P1.2 P1.3 SEG_P1.3 P1.4 P1.5 P1.6 P1.7 RST P3.0 RXD P3.1 TXD P3.6 LS_C1_P3.6 P3.7 L