Datasheet

dsPIC30F1010/202X
DS70178C-page 166 Preliminary © 2006 Microchip Technology Inc.
REGISTER 15-2: U1STA: UART1 STATUS AND CONTROL REGISTER
R/W-0 R/W-0 R/W-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0
UTXISEL1 UTXINV
(1)
UTXISEL0 — UTXBRK UTXEN UTXBF TRMT
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
URXISEL1 URXISEL0 ADDEN RIDLE PERR FERR OERR URXDA
bit 7 bit 0
Legend: U = Unimplemented bit, read as ‘0’
R = Readable bit W = Writable bit HS =Hardware Set HC = Hardware Cleared
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15, 13 UTXISEL1:UTXISEL0: 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 UTXINV: IrDA Encoder Transmit Polarity Inversion bit
(1)
1 = IrDA encoded U1TX idle state is ‘1’
0 = IrDA encoded U1TX idle state is ‘0’
Note 1: Value of bit only affects the transmit properties of the module when the IrDA encoder is
enabled (IREN = 1).
bit 12 Unimplemented: Read as ‘0’
bit 11 UTXBRK: Transmit Break bit
1 = Send 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 disabled or completed
bit 10 UTXEN: Transmit Enable bit
1 = Transmit enabled, U1TX pin controlled by UART1
0 = Transmit disabled, any pending transmission is aborted and buffer is reset. U1TX pin controlled by
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 URXISEL1:URXISEL0: 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 enabled. If 9-bit mode is not selected, this does not take effect.
0 = Address Detect mode disabled