M16C User Manual.pdf

Serial I/OMitsubishi microcomputersM16C / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTERUARTi transmit/receive control register 0b7 b6 b5 b4 b3 b2 b1 b0Symbol Address When resetUiC0(i=0,1) 03A416, 03AC16 0816BitsymbolCLK0CLK1CRSTXEPTCRDNCHBit nameBRG count sourceselect bitCTS/RTS functionselect bitTransmit register emptyflagCTS/RTS disable bitData output select bitFunction(During clock synchronousserial I/O mode)b1 b00 0 : f1 is selected0 1 : f8 is selected1 0 : f32 is selected1 1 : InhibitedValid when bit 4 = “0”0 : CTS function is selected (Note 1)1 : RTS function is selected (Note 2)0 : Data present in transmitregister (during transmission)1 : No data present in transmitregister (transmissioncompleted)0 : CTS/RTS function enabled1 : CTS/RTS function disabled(P60 and P64 function asprogrammable I/O port)0 : TXDi pin is CMOS output1 : TXDi pin is N-channelopen-drain outputFunction(During UART mode)b1 b00 0 : f1 is selected0 1 : f8 is selected1 0 : f32 is selected1 1 : InhibitedValid when bit 4 = “0”0 : CTS function is selected (Note 1)1 : RTS function is selected (Note 2)0 : Data present in transmit register(during transmission)1 : No data present in transmitregister (transmission completed)0 : CTS/RTS function enabled1 : CTS/RTS function disabled(P60 and P64 function asprogrammable I/O port)0: TXDi pin is CMOS output1: TXDi pin is N-channelopen-drain outputCKPOL CLK polarity select bit0 : Transmit data is output atfalling edge of transfer clockMust always be “0”and receive data is input atrising edge1 : Transmit data is output atrising edge of transfer clockand receive data is input atfalling edgeUFORM Transfer format select bit 0 : LSB first1 : MSB firstMust always be “0”Note 1: Set the corresponding port direction register to “0”.Note 2: The settings of the corresponding port register and port direction register are invalid.UART2 transmit/receive control register 0R W b7 b6 b5 b4 b3 b2 b1 b0Symbol Address When resetU2C0 037C16 0816BitsymbolCLK0CLK1CRSTXEPTCRDBit nameBRG count sourceselect bitCTS/RTS functionselect bitTransmit register emptyflagCTS/RTS disable bitFunction(During clock synchronousserial I/O mode)b1 b00 0 : f1 is selected0 1 : f8 is selected1 0 : f32 is selected1 1 : Inhibited0 : Data present in transmitregister (during transmission)1 : No data present in transmitregister (transmissioncompleted)0 : CTS/RTS function enabled1 : CTS/RTS function disabled(P73 functionsprogrammable I/O port)Function(During UART mode)Nothing is assigned.0 : TXDi pin is CMOS output 0: TXDi pin is CMOS outputIn an attempt to write to this bit, write 1 “0”. : TXDi The pin value, is N-channel if read, turns out 1: TXDi to be pin “0”. is N-channelopen-drain outputopen-drain outputCKPOL CLK polarity select bit0 : Transmit data is output atfalling edge of transfer clockMust always be “0”and receive data is input atrising edge1 : Transmit data is output atrising edge of transfer clockand receive data is input atfalling edgeUFORM Transfer format select bit(Note 3)Valid when bit 4 = “0”0 : CTS function is selected (Note 1)1 : RTS function is selected (Note 2)0 : LSB first1 : MSB firstb1 b00 0 : f1 is selected0 1 : f8 is selected1 0 : f32 is selected1 1 : InhibitedValid when bit 4 = “0”0 : CTS function is selected (Note 1)1 : RTS function is selected (Note 2)0 : Data present in transmit register(during transmission)1 : No data present in transmitregister (transmission completed)0 : CTS/RTS function enabled1 : CTS/RTS function disabled(P73 functions programmableI/O port)0 : LSB first1 : MSB firstNote 1: Set the corresponding port direction register to “0”.Note 2: The settings of the corresponding port register and port direction register are invalid.Note 3: Only clock synchronous serial I/O mode and 8-bit UART mode are valid.R W Figure 1.19.6. Serial I/O-related registers (3)119