Datasheet

 2010-2012 Microchip Technology Inc. DS41412F-page 289
PIC18(L)F2X/4XK22
16.5.1.5 Synchronous Master Transmission
Setup:
1. Initialize the SPBRGHx, SPBRGx register pair
and the BRGH and BRG16 bits to achieve the
desired baud rate (see Section 16.4 “EUSART
Baud Rate Generator (BRG)”).
2. Set the RXx/DTx and TXx/CKx TRIS controls to
‘1’.
3. Enable the synchronous master serial port by
setting bits SYNC, SPEN and CSRC. Set the
TRIS bits corresponding to the RXx/DTx and
TXx/CKx I/O pins.
4. Disable Receive mode by clearing bits SREN
and CREN.
5. Enable Transmit mode by setting the TXEN bit.
6. If 9-bit transmission is desired, set the TX9 bit.
7. If interrupts are desired, set the TXxIE, GIE/
GIEH and PEIE/GIEL interrupt enable bits.
8. If 9-bit transmission is selected, the ninth bit
should be loaded in the TX9D bit.
9. Start transmission by loading data to the
TXREGx register.
FIGURE 16-10: SYNCHRONOUS TRANSMISSION
FIGURE 16-11: SYNCHRONOUS TRANSMISSION (THROUGH TXEN)
bit 0 bit 1 bit 7
Word 1
bit 2 bit 0 bit 1 bit 7
RXx/DTx
Write to
TXREGx Reg
TXxIF bit
(Interrupt Flag)
TXEN bit
‘1’ ‘1’
Word 2
TRMT bit
Write Word 1
Write Word 2
Note: Sync Master mode, SPBRGx = 0, continuous transmission of two 8-bit words.
pin
TXx/CKx pin
TXx/CKx pin
(SCKP = 0)
(SCKP = 1)
RXx/DTx pin
TXx/CKx pin
Write to
TXREGx reg
TXxIF bit
TRMT bit
bit 0
bit 1
bit 2
bit 6 bit 7
TXEN bit