PIC18F23K20-ESLASHML datasheet(258/456 Pages) MICROCHIP

258 / 456 page

PIC18F2XK20/4XK20

DS41303G-page 258

 2010 Microchip Technology Inc.

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)”).

Set the RX/DT and TX/CK TRIS controls to ‘1’.

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 register.

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

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