MCP19116 datasheet(70/246 Pages) MICROCHIP

70 / 246 page

MCP19116/7

DS20005479B-page 70

 2015-2016 Microchip Technology Inc.

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

A set ninth data bit will indicate that the eight Least

Significant data bits are an address when the receiver

is set for address detection.

While TXIF indicates the status of the transmit buffer

tus of the transmit operation. The TRMT bit is cleared

automatically upon a byte transfer from TXREG to the

Shift register, and is set at the end of a stop bit. A ‘1’

value in the TRMT bit signifies that the transmit state

machine is idle. The TRMT bit is read-only and is valid

for both Asynchronous and Synchronous transmis-

sions. No interrupt is associated with the TRMT bit.

When setting up an Asynchronous Transmission,

follow these steps:

Initialize the SPBRG register for the appropriate

baud rate. If a high-speed baud rate is desired,

set bit BRGH.

Enable the asynchronous serial port by clearing

bit SYNC and setting bit SPEN.

If interrupts are desired, then set enable bit

TXIE.

If 9-bit transmission is desired, then set transmit

bit TX9.

Enable the transmission by setting bit TXEN,

which will also set bit TXIF.

If 9-bit transmission is selected, the ninth bit

should be loaded in bit TX9D.

Load data to the TXREG register (starts

transmission).

If using interrupts, set GIE (INTCON<7>) and

PEIE (INTCON<6>) bits.

FIGURE 10-1:

USART TRANSMIT BLOCK DIAGRAM

FIGURE 10-2:

ASYNCHRONOUS MASTER TRANSMISSION

TXIF

TXIE

Interrupt

TXEN

Baud Rate CLK

SPBRG

Baud Rate Generator

TX9D

MSb

LSb

Data Bus

TXREG register

TSR register

(8)

TX9

TRMT

SPEN

GPB6/TX/CK pin

Pin Buffer

and Control

2 2 2

Write to TXREG

Write

Word 1

BRG output

(shift clock)

Start Bit

Bit 0

Bit 1

Bit 7/8

Stop Bit

WORD 1

TXIF bit

(Transmit buffer

reg. empty flag)

TX (pin)

WORD 1

Transmit Shift Reg

TRMT bit

(Transmit shift

reg. empty flag)

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