PIC16C765SLASHP datasheet(75/158 Pages) MICROCHIP

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DS41124A-page 75

PIC16C745/765

11.0

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 Commu-

nications Interface or SCI). The USART can be config-

ured as a full duplex asynchronous system that can

communicate with peripheral devices, such as CRT ter-

minals and personal computers, or it can be configured

as a half duplex synchronous system that can commu-

nicate with peripheral devices, such as A/D or D/A inte-

grated circuits, Serial EEPROMs etc.

The USART can be configured in the following modes:

• Asynchronous (full duplex)

• Synchronous - Master (half duplex)

• Synchronous - Slave (half duplex)

Bits SPEN (RCSTA<7>) and 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.

TRANSMIT STATUS AND CONTROL REGISTER (TXSTA: 98h)

R/W-0

U-0

R/W-0

R-1

R/W-0

CSRC

TX9

TXEN

SYNC

—

BRGH

TRMT

TX9D

= Readable bit

W = Writable bit

= Unimplemented bit,

read as ‘0’

- n = Value at POR reset

bit7

bit0

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 used for parity.)

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