dsPIC30F Family Reference Manual
DS70066C-page 19-20 © 2004 Microchip Technology Inc.
19.9 Initialization
Example 19-2 is an initialization routine for the Transmitter/Receiver in 8-bit mode. Example 19-3
shows an initialization of the Addressable UART in 9-bit Address Detect mode. In both examples,
the value to load into the UxBRG register is dependent on the desired baud rate and the device
frequency.
Example 19-2: 8-bit Transmit/Receive (UART1)
Example 19-3: 8-bit Transmit/Receive (UART1), Address Detect Enabled
Note: The UTXEN bit should not be set until the UARTEN bit has been set. Otherwise,
UART transmissions will not be enabled.
MOV #baudrate,W0 ; Set Baudrate
MOV W0,U1BRG
BSET IPC2,#U1TXIP2 ; Set UART TX interrupt priority
BCLR IPC2,#U1TXIP1 ;
BCLR IPC2,#U1TXIP0 ;
BSET IPC2,#U1RXIP2 ; Set UART RX interrupt priority
BCLR IPC2,#U1RXIP1 ;
BCLR IPC2,#U1RXIP0 ;
CLR U1STA
MOV #0x8800,W0 ; Enable UART for 8-bit data,
; no parity, 1 STOP bit,
; no wakeup
MOV W0,U1MODE
BSET U1STA,#UTXEN ; Enable transmit
BSET IEC0,#U1TXIE ; Enable transmit interrupts
BSET IEC0,#U1RXIE ; Enable receive interrupts
MOV #baudrate,W0 ; Set Baudrate
MOV W0,U1BRG
BSET IPC2,#U1TXIP2 ; Set UART TX interrupt priority
BCLR IPC2,#U1TXIP1 ;
BCLR IPC2,#U1TXIP0 ;
BSET IPC2,#U1RXIP2 ; Set UART RX interrupt priority
BCLR IPC2,#U1RXIP1 ;
BCLR IPC2,#U1RXIP0 ;
BSET U1STA,#ADDEN ; Enable address detect
MOV #0x8883,W0 ; UART1 enabled for 9-bit data,
; no parity, 1 STOP bit,
; wakeup enabled
MOV W0,U1MODE
BSET U1STA,#UTXEN ; Enable transmit
BSET IEC0,#U1TXIE ; Enable transmit interrupts
BSET IEC0,#U1RXIE ; Enable receive interrupts
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