Datasheet

PIC18(L)F1XK22
DS41365E-page 196  2009-2011 Microchip Technology Inc.
15.4.1.5 Synchronous Master Transmission
Set-up:
1. Initialize the SPBRGH, SPBRG register pair and
the BRGH and BRG16 bits to achieve the
desired baud rate (see Section 15.3 “EUSART
Baud Rate Generator (BRG)”).
2. Enable the synchronous master serial port by
setting bits SYNC, SPEN and CSRC. Set the
TRIS bits corresponding to the RX/DT and
TX/CK I/O pins.
3. Disable Receive mode by clearing bits SREN
and CREN.
4. Enable Transmit mode by setting the TXEN bit.
5. If 9-bit transmission is desired, set the TX9 bit.
6. If interrupts are desired, set the TXIE, GIE and
PEIE interrupt enable bits.
7. If 9-bit transmission is selected, the ninth bit
should be loaded in the TX9D bit.
8. Start transmission by loading data to the TXREG
register.
FIGURE 15-10: SYNCHRONOUS TRANSMISSION
FIGURE 15-11: SYNCHRONOUS TRANSMISSION (THROUGH TXEN)
bit 0 bit 1 bit 7
Word 1
bit 2 bit 0 bit 1 bit 7
RX/DT
Write to
TXREG Reg
TXIF bit
(Interrupt Flag)
TXEN bit
‘1’ ‘1’
Word 2
TRMT bit
Write Word 1
Write Word 2
Note: Sync Master mode, SPBRG = 0, continuous transmission of two 8-bit words.
pin
TX/CK pin
TX/CK pin
(SCKP = 0)
(SCKP = 1)
RX/DT pin
TX/CK pin
Write to
TXREG reg
TXIF bit
TRMT bit
bit 0
bit 1
bit 2
bit 6 bit 7
TXEN bit