Datasheet
2011-2013 Microchip Technology Inc. DS70657G-page 281
dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X AND PIC24EPXXXGP/MC20X
20.3 UARTx Control Registers
REGISTER 20-1: UxMODE: UARTx MODE REGISTER
R/W-0 U-0 R/W-0 R/W-0 R/W-0 U-0 R/W-0 R/W-0
UARTEN
(1)
— USIDL IREN
(2)
RTSMD —UEN<1:0>
bit 15 bit 8
R/W-0, HC R/W-0 R/W-0, HC R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
WAKE LPBACK ABAUD URXINV BRGH PDSEL<1:0> STSEL
bit 7 bit 0
Legend: HC = Hardware Clearable bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 UARTEN: UARTx Enable bit
(1)
1 = UARTx is enabled; all UARTx pins are controlled by UARTx as defined by UEN<1:0>
0 = UARTx is disabled; all UARTx pins are controlled by PORT latches; UARTx power consumption is
minimal
bit 14 Unimplemented: Read as ‘0’
bit 13 USIDL: UARTx Stop in Idle Mode bit
1 = Discontinues module operation when device enters Idle mode
0 = Continues module operation in Idle mode
bit 12 IREN: IrDA
®
Encoder and Decoder Enable bit
(2)
1 = IrDA encoder and decoder are enabled
0 = IrDA encoder and decoder are disabled
bit 11 RTSMD: Mode Selection for UxRTS
Pin bit
1 =UxRTS
pin is in Simplex mode
0 =UxRTS
pin is in Flow Control mode
bit 10 Unimplemented: Read as ‘0’
bit 9-8 UEN<1:0>: UARTx Pin Enable bits
11 = UxTX, UxRX and BCLKx pins are enabled and used; UxCTS
pin is controlled by PORT latches
(3)
10 = UxTX, UxRX, UxCTS and UxRTS pins are enabled and used
(4)
01 = UxTX, UxRX and UxRTS pins are enabled and used; UxCTS pin is controlled by PORT latches
(4)
00 = UxTX and UxRX pins are enabled and used; UxCTS and UxRTS/BCLKx pins are controlled by
PORT latches
bit 7 WAKE: Wake-up on Start bit Detect During Sleep Mode Enable bit
1 = UARTx continues to sample the UxRX pin; interrupt is generated on the falling edge; bit is cleared
in hardware on the following rising edge
0 = No wake-up is enabled
bit 6 LPBACK: UARTx Loopback Mode Select bit
1 = Enables Loopback mode
0 = Loopback mode is disabled
Note 1: Refer to Section 17. “UART” (DS70582) in the “dsPIC33E/PIC24E Family Reference Manual” for information
on enabling the UARTx module for receive or transmit operation.
2: This feature is only available for the 16x BRG mode (BRGH = 0).
3: This feature is only available on 44-pin and 64-pin devices.
4: This feature is only available on 64-pin devices.