PIC16CR74ESLASHSP datasheet(71/172 Pages) MICROCHIP

71 / 172 page

DS21993C-page 69

PIC16CR7X

10.0

UNIVERSAL SYNCHRONOUS

ASYNCHRONOUS RECEIVER

TRANSMITTER (USART)

The Universal Synchronous Asynchronous Receiver

Transmitter (USART) module is one of the two serial

I/O modules. (USART is also known as a Serial

Communications Interface or SCI.) The USART can be

configured as a full duplex asynchronous system that

can communicate with peripheral devices, such as

CRT terminals and personal computers, or it can be

configured as a half duplex synchronous system that

can communicate with peripheral devices, such as A/D

or D/A integrated circuits, serial EEPROMs, etc.

The USART can be configured in the following modes:

• Asynchronous (full duplex)

• Synchronous – Master (half duplex)

• Synchronous – Slave (half duplex)

Bit SPEN (RCSTA<7>) and bits TRISC<7:6> have to be

set in order to configure pins RC6/TX/CK and

RC7/

RX/DT as the Universal Synchronous Asynchronous

Receiver Transmitter.

TXSTA: TRANSMIT STATUS AND CONTROL (ADDRESS 98h)

R/W-0

U-0

R/W-0

R-1

R/W-0

CSRC

TX9

TXEN

SYNC

—

BRGH

TRMT

TX9D

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

CSRC: Clock Source Select bit

Asynchronous mode:

Don’t care

Synchronous mode:

= Master mode (clock generated internally from BRG)

= Slave mode (clock from external source)

bit 6

TX9: 9-bit Transmit Enable bit

= Selects 9-bit transmission

= Selects 8-bit transmission

bit 5

TXEN: Transmit Enable bit

= Transmit enabled

= Transmit disabled

Note:

SREN/CREN overrides TXEN in Sync mode

bit 4

SYNC: USART Mode Select bit

= Synchronous mode

= Asynchronous mode

bit 3

Unimplemented: Read as ‘0’

bit 2

BRGH: High Baud Rate Select bit

Asynchronous mode:

= High speed

= Low speed

Synchronous mode:

Unused in this mode

bit 1

TRMT: Transmit Shift Register Status bit

= TSR empty

= TSR full

bit 0

TX9D: 9th bit of Transmit Data

Can be parity bit

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