Microchip Technology MA330025-1 Data Sheet
2009-2012 Microchip Technology Inc.
DS70616G-page 355
dsPIC33EPXXX(GP/MC/MU)806/810/814 and PIC24EPXXX(GP/GU)810/814
20.3
UARTx Registers
REGISTER 20-1:
UxMODE: UART
x
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
—
USIDL
IREN
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 = 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
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
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
)
1 = IrDA encoder and decoder are enabled
0 = IrDA encoder and decoder are disabled
0 = IrDA encoder and decoder are disabled
bit 11
RTSMD: Mode Selection for UxRTS Pin bit
1 = UxRTS pin in Simplex mode
0 = UxRTS pin in Flow Control mode
1 = UxRTS pin in Simplex mode
0 = UxRTS pin in Flow Control mode
bit 10
Unimplemented: Read as ‘0’
bit 9-8
UEN<1:0>: UARTx Pin Enable bits
11 = UxTX, UxRX and BCLK pins are enabled and used; UxCTS pin is controlled by port latches
10 = UxTX, UxRX, UxCTS and UxRTS pins are enabled and used
01 = UxTX, UxRX and UxRTS pins are enabled and used; UxCTS pin is controlled by port latches
00 = UxTX and UxRX pins are enabled and used; UxCTS and UxRTS/BCLK pins are controlled by
11 = UxTX, UxRX and BCLK pins are enabled and used; UxCTS pin is controlled by port latches
10 = UxTX, UxRX, UxCTS and UxRTS pins are enabled and used
01 = UxTX, UxRX and UxRTS pins are enabled and used; UxCTS pin is controlled by port latches
00 = UxTX and UxRX pins are enabled and used; UxCTS and UxRTS/BCLK 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 falling edge; bit is cleared in
1 = UARTx continues to sample the UxRX pin; interrupt is generated on falling edge; bit is cleared in
hardware on 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
1 = Enables Loopback mode
0 = Loopback mode is disabled
bit 5
ABAUD: Auto-Baud Enable bit
1 = Enables baud rate measurement on the next character – requires reception of a Sync field (55h)
1 = Enables baud rate measurement on the next character – requires reception of a Sync field (55h)
before other data; cleared in hardware upon completion
0 = Baud rate measurement is disabled or has completed
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).