PIC18F23K22 Datasheet, PDF (284/492 Pages) Microchip Technology – 28/40/44-Pin, Low-Power, High-Performance Microcontrollers with nanoWatt XLP Technology

PIC18(L)F2X/4XK22
16.4.1.5 Synchronous Master Transmission
Set-up:
1. Initialize the SPBRGHx, SPBRGx register pair
and the BRGH and BRG16 bits to achieve the
desired baud rate (see Section 16.3 “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
RXx/DTx
pin
bit 0
bit 1
bit 2
bit 7
bit 0
bit 1
bit 7
Word 1
Word 2
TXx/CKx pin
(SCKP = 0)
TXx/CKx pin
(SCKP = 1)
Write to
TXREGx Reg
TXxIF bit
(Interrupt Flag)
Write Word 1
TRMT bit
Write Word 2
TXEN bit ^{‘1’}
‘1’
Note:
Sync Master mode, SPBRGx = 0, continuous transmission of two 8-bit words.
FIGURE 16-11: SYNCHRONOUS TRANSMISSION (THROUGH TXEN)
RXx/DTx pin
bit 0
bit 1
bit 2
bit 6
bit 7
TXx/CKx pin
Write to
TXREGx reg
TXxIF bit
TRMT bit
TXEN bit
DS41412B-page 284
Preliminary
 2010 Microchip Technology Inc.