1 2 3 4 VDD D2 R3 1k D1 LED R1 1k 5V D C B A D C B A VDD RED VDD GREEN 5V L1 U1 CH341T C9 U2 STC12C4052 470uH C1 10uF/16V C2 104 RF12 104 nINT/VDI 1 2 3 4 5 6 7 8 1 2 17 18 19 12 13 14 15 nRES ACT ROV RDY TNOW TEN P10 P11 DCLK/CFIL/FFIT 11 FSK/DATA/nFFS LED SDI SCK nSEL SDO PWM0/CEX0/P37 PWM1/CEX1/T1/P35P12 ECI/T0/P34 9 8 C11 10uF/16V C10 10uF/16V AVR-ISP P13 C3 103 USB 6 7 8 16 17 18 19 nSEL SDI SDO SCK nIRQ V3 D+ D- P14/SS P15/MOSI P16/MISO P17/SCLK nIRQ nINT/VDI 6 7 FSK/DATA/nFFS DCLK/CFIL/FFIT CLK nRES GND 1 2 3 4 INT1/P33 INT0/P32 D- D+ 3 4 5 TXD RXD INT 9 10 11 12 Reset 1 RST 4 5 2 3 XTAL2 XTAL1 P30/RXD P31/TXD X2 14 15 16 R2 10k NC. SDA SCL 9 XI X1 22.1184M 10 XO C7 22p C8 22p 12M C5 22p C6 22p AVRISP AVR-ISP 1 2 CON2 SELF_USEISP-PORT GND RXD TXD 1 2 3 4 1 2 3 4 5V CON4 D3 1N5819 SELF_USETTL-UART GND RXD TXD VDD 1 2 3 4 1 2 3 4 CON4 （作为USB转无线或自身编程的连接线） Title 小车USB下载 RF接口部分 Revision Size A4 Number SCH2007-004 Date: File: 30-Apr-2007 E:\DINGQI\..\SUMO-U2R.SCH Sheet of Drawn By: 1 2 3 4