PIC16F1946 Datasheet, PDF (312/440 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology

PIC16F/LF1946/47
24.4.1.5 Synchronous Master Transmission
Set-up:
1. Initialize the SPxBRGH, SPxBRGL register pair
and the BRGH and BRG16 bits to achieve the
desired baud rate (see Section 24.3 “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 and
PEIE 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
TXxREG register.
FIGURE 24-10: 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
TXxREG Reg
TXxIF bit
(Interrupt Flag)
Write Word 1
TRMT bit
Write Word 2
TXEN bit ^{‘1’}
‘1’
Note:
Sync Master mode, SPxBRGL = 0, continuous transmission of two 8-bit words.
FIGURE 24-11: SYNCHRONOUS TRANSMISSION (THROUGH TXEN)
RXx/DTx pin
bit 0
bit 1
bit 2
bit 6
bit 7
TXx/CKx pin
Write to
TXxREG reg
TXxIF bit
TRMT bit
TXEN bit
DS41414A-page 310
Preliminary
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