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1、PIC24?by Zeng 2012-6-13?MCU?/?t?1/t?8?9?/?8?15 bps?1 Mbps?16 M?UxCTS?UxRTS?4?First-In-First-Out?FIFO?4?FIFO?9?9?=1?0/1101/01/01/01/01/01/01/01/0101/01/01/08?n?(?)?n+1?LSBMSB?7?1?PIC24?by Zeng 2012-6-13?Loopback?7-2?UART?UART?IrDA(Infrared Data Association)?UART?(UxRX)?(UxTx)?2?UxMODE?UxBRG?UxMODE?7?
2、1?UxMODE?UxMODE?R/W-0U-0 R/W-0 R/W-0R/W-0R/W-0 R/W-0 R/W-0UARTEN?USIDLIRENRTSMDALTIO(1)UEN?R/W-0 R/W-0R/W-0 R/W-0 R/W-0R/W-0 R/W-0 R/W-0WAKELPBACKABAUDRXINVBRGHPDSELSTSEL?UARTEN?USIDL?IrDA?UARTx?UARTx?UxTXUxRXUxCTSUxRTSBCLKx?7?2 UART?PIC24?by Zeng 2012-6-13?IREN?RTSMD?ALTIO?UEN?WAKE?LPBACK?ABAUD?RXI
3、NV?1=UxRX?00=UxRX?1?BRGH?PDSEL?STSEL?1=2?0=1?1?PIC24FJ128GA?ALTIO?(UxMODE)?2?PDSEL=10?01?/?8?1?7?2?UARTx?UxSTA?PIC24?by Zeng 2012-6-13?R/W-0 R/W-0 R/W-0 U-0R/W-0R/W-0 R-0 R-1UTXISEL1UTXINVUTXISEL0?UTXBRKUTXENUTXBFTRMTbit 15bit 8R/W-0 R/W-0R/W-0 R-1 R-0R-0 R/C-0 R-0URXISELADDENRIDLEPERRFERROERRURXDAb
4、it 7 bit 0?UTXISEL?UTXINV?:IREN=0:1=UxTX?00=UxTX?1IREN=1:1=IrDA?UxTX?10=IrDA?UxTX?0?UTXBRK?UTXEN?UTXBF?TRMT?URXISEL?ADDEN?RIDLE?PERR?FERR?PIC24?by Zeng 2012-6-13?OERR?URXDA?R/W-0 R/W-0 R/W-0 R/W-0R/W-0R/W-0 R/W-0 R/W-0BRG?R/W-0 R/W-0 R/W-0 R/W-0R/W-0R/W-0 R/W-0 R/W-0BRG?BRGH*4(?BRGH4?Fosc?32MHz?Fcy?
5、32MHz/2?16MHz?9600?BRGH?0?7?2?U1RBG?N?N?(16M/(16*9600)-1?103.17,?N?103?16M/(16*103+1)?9615.4?(9615.4-9600)/9600=0.16%?C30?U1RBG=103;U1MODEbits.BRGH=0;?BRGH?1?U1RBG?N?N?(16M*4/(16*9600)-1?416.67.,?N?417?16M*4/(16*417+1)?9590.9?(9590.9-9600)/9600?0.095%?C30?U1RBG=417;U1MODEbits.BRGH=1;?7?1?BRGH=1?Fcy/
6、4?BRGH=0?Fcy/(4*65536)?PIC24?by Zeng 2012-6-13?UxBRG?BRG?UARTx?7?4?16MHz?12MHz?8MHz?RBG?BRGH?1?RBG?UARTx?UxRXREG?UxTXREG?UxRXREG?U-0 U-0 U-0 U-0U-0U-0 U-0 R-0?URX8?R-0 R-0 R-0 R-0R-0R-0 R-0 R-0URX?D8?D7?D0?UxTXREGPIC24?by Zeng 2012-6-13UART?U-0 U-0 U-0 U-0U-0U-0 U-0 W-x?UTX8?W-x W-x W-x W-xW-xW-x W-
7、x W-xUTX?D8?D7?D0?7?4?7?5?UARTx?UxRXREG?UxTXREG?UxRXREG?UxTXREG?UARTx?8/9?UxRXREG?UxTXREG?7.4?UART?1?PIC24?by Zeng 2012-6-13?9?UxMODE?PDSEL?UxMODE?11?C30?int?unsigned int?9?UxTXREG?UTX8?UxTXREG?9?9?UTXISEL?1?UxMODEUxSTA?UxTXIF?UTX8 UxTXREG?D15?D9 D8 D7?D0?/?UxTSR?0?1?UTXBRKUxTX?FIFO?UART?PIC24?by Ze
8、ng 2012-6-13UART?2?UART?UART?1?7?4?7?1?/?7?2?UxBRG?2?IEC?UxTXIE?1?PIC24?by Zeng 2012-6-13?9?4?PIC24?by Zeng 2012-6-13?2.?RIDLE?UxSTA?UxRSR?UxRSR?1?UxRSR?UxRSR?RIDLE?UxSTA?3?UART?UART(?)?UxMODEUxSTA?UxRXIFURX8 UxRXREG?D15?D9 D8 D7?D0?/?16?LPBACKUxRX?FIFO?UART?16?PIC24?by Zeng 2012-6-13?1?7?4?7?1?/?7?
9、2?UxBRG?2?PDSEL?UxMODE?STSEL?UxMODE?3?URXISEL?UxSTA?4?UART?UARTEN?UxMODE?1?IEC?UxRXIE?1?UxSTA?1?2?4?PIC24?by Zeng 2012-6-13UART?1.?(Loopback Mode)?UxMODE?UARTx?UARTx?UxMODE?UxMODE?UEN?RS?232?2?UxMODE?PIC24?by Zeng 2012-6-13UART?UxMODE?BRGH?UxMODE?3?PIC24?by Zeng 2012-6-13?RIDLE?UxSTA?1?UxRSR?UxRX?1?
10、UxRXIF?1?UxRXIF?CPU?UxMODE?UARTx?IECn?UxRXIE?1?CPU?WAKE?UART?UxMODE?UARTx?IECn?UxRXIE?1?CPU?WAKE?UART?UxMODE?UARTx?CPU?UART?UxMODE?CPU?UART?PIC24?by Zeng 2012-6-13?Maxim Integrated Products?7-5 MAX232?PIC24?0.1u0.1u0.1uC1+1V+2C1-3C2+4C2-5V-6T2O7R2I8VCC16GND15T1O14R1I13R1O12T1I11T2I10R2O9U1MAX2320.1u
11、+3.3VU2RXU2TXRXDTXDPIC24235RS232DB9PIC24?by Zeng 2012-6-13?7-6 PIC 24?RS485?RO1RE2DE3DI4VCC8B7A6GND5?+5V+3.3VP IC24 U2RXP IC24 U2TX12RS48510K+5VPIC24?by Zeng 2012-6-13?7?7Modbus?PIC24?by Zeng 2012-6-13?2.Modbus?Modbus?RTU?03?1?m041?1?m2?1?16?ID?m?CRC160304?1?162?2?1?m2?PIC24?by Zeng 2012-6-13?PIC24?by Zeng 2012-6-13?