Datasheet

PIC24FJ128GA010 FAMILY
DS39747F-page 150  2005-2012 Microchip Technology Inc.
REGISTER 17-2: UxSTA: UARTx STATUS AND CONTROL REGISTER
R/W-0 R/W-0 R/W-0 U-0 R/W-0, HC R/W-0 R-0 R-1
UTXISEL1 TXINV UTXISEL0 — UTXBRK UTXEN UTXBF TRMT
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R-1 R-0 R-0 R/C-0 R-0
URXISEL1 URXISEL0 ADDEN RIDLE PERR FERR OERR URXDA
bit 7 bit 0
Legend: C = Clearable bit 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 15,13 UTXISEL<1:0>: Transmission Interrupt Mode Selection bits
11 = Reserved; do not use
10 = Interrupt when a character is transferred to the Transmit Shift Register and as a result, the transmit
buffer becomes empty
01 = Interrupt when the last character is shifted out of the Transmit Shift Register; all transmit operations
are completed
00 = Interrupt when a character is transferred to the Transmit Shift Register (this implies there is at least
one character open in the transmit buffer)
bit 14 TXINV: Transmit Polarity Inversion bit
IREN =
0:
1 = TX Idle state is ‘0’
0 = TX Idle state is ‘1’
IREN =
1:
1 = IrDA
®
encoded TX Idle state is ‘1’
0 = IrDA encoded TX Idle state is ‘0’
bit 12 Unimplemented: Read as ‘0’
bit 11 UTXBRK: Transmit Break bit
1 = Sends Sync Break on next transmission – Start bit, followed by twelve ‘0’ bits, followed by Stop bit;
cleared by hardware upon completion
0 = Sync Break transmission is disabled or completed
bit 10 UTXEN: Transmit Enable bit
1 = Transmit is enabled, UxTX pin controlled by UARTx
0 = Transmit is disabled, any pending transmission is aborted and the buffer is reset. UxTX pin is controlled
by the PORT.
bit 9 UTXBF: Transmit Buffer Full Status bit (read-only)
1 = Transmit buffer is full
0 = Transmit buffer is not full, at least one more character can be written
bit 8 TRMT: Transmit Shift Register Empty bit (read-only)
1 = Transmit Shift Register is empty and transmit buffer is empty (the last transmission has completed)
0 = Transmit Shift Register is not empty, a transmission is in progress or queued
bit 7-6 URXISEL<1:0>: Receive Interrupt Mode Selection bits
11 = Interrupt is set on RSR transfer, making the receive buffer full (i.e., has 4 data characters)
10 = Interrupt is set on RSR transfer, making the receive buffer 3/4 full (i.e., has 3 data characters)
0x = Interrupt is set when any character is received and transferred from the RSR to the receive buffer;
receive buffer has one or more characters
bit 5 ADDEN: Address Character Detect bit (bit 8 of received data = 1)
1 = Address Detect mode is enabled. If 9-bit mode is not selected, this does not take effect.
0 = Address Detect mode is disabled