PIC18F23K20-ESLASHSOSQTP datasheet(250/420 Pages) MICROCHIP

250 / 420 page

PIC18F2XK20/4XK20

DS41303B-page 248

Advance Information

18.4.1.5

Synchronous Master Transmission

Set-up:

Initialize the SPBRGH, SPBRG register pair and

the BRGH and BRG16 bits to achieve the

desired baud rate (see Section 18.3 “EUSART

Baud Rate Generator (BRG)”).

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.

Disable Receive mode by clearing bits SREN

and CREN.

Enable Transmit mode by setting the TXEN bit.

If 9-bit transmission is desired, set the TX9 bit.

If interrupts are desired, set the TXIE, GIE and

PEIE interrupt enable bits.

If 9-bit transmission is selected, the ninth bit

should be loaded in the TX9D bit.

Start transmission by loading data to the TXREG

FIGURE 18-10:

SYNCHRONOUS TRANSMISSION

FIGURE 18-11:

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’

Word 2

TRMT bit

Write Word 1

Write Word 2

Note:

Sync Master mode, SPBRG = 0, continuous transmission of two 8-bit words.

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

PIC18F23K20-E/SOSQTP Datasheet(PDF) 250 Page - Microchip Technology

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