INTEDG datasheet(319/478 Pages) MICROCHIP

319 / 478 page

 2010-2012 Microchip Technology Inc.

DS41414D-page 319

PIC16(L)F1946/47

25.5.1.5

Synchronous Master Transmission

Set-up:

Initialize the SPxBRGH, SPxBRGL register pair

and the BRGH and BRG16 bits to achieve the

desired baud rate (see Section 25.4 “EUSART

Baud Rate Generator (BRG)”

Set the RXx/DTx and TXx/CKx TRIS controls to

‘1’.

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.

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 TXxIE, 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

TXxREG register.

FIGURE 25-10:

SYNCHRONOUS TRANSMISSION

FIGURE 25-11:

SYNCHRONOUS TRANSMISSION (THROUGH TXEN)

bit 0

bit 1

bit 7

Word 1

bit 2

bit 0

bit 1

bit 7

RXx/DTx

Write to

TXxREG Reg

TXxIF bit

(Interrupt Flag)

TXEN bit

‘1’

Word 2

TRMT bit

Write Word 1

Write Word 2

Note:

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

TXx/CKx pin

(SCKP = 0)

(SCKP = 1)

RXx/DTx pin

TXx/CKx pin

Write to

TXxREG reg

TXxIF bit

TRMT bit

bit 0

bit 1

bit 2

bit 6

bit 7

TXEN bit

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