PIC16F628-20SLASHSS datasheet(71/160 Pages) MICROCHIP

71 / 160 page

Preliminary

DS40300B-page 71

PIC16F62X

12.0

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 Com-

munications Interface or SCI). The USART can be con-

figured 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)

Bit SPEN (RCSTA<7>), and bits TRISB<2:1>, have

to be set in order to configure pins RB2/TX/CK and

RB1/RX/DT as the Universal Synchronous Asyn-

chronous Receiver Transmitter.

R/W-0

U-0

R/W-0

R-1

R/W-0

CSRC

TX9

TXEN

SYNC

—

BRGH

TRMT

TX9D

R = Readable bit

W = Writable bit

U = 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 parity bit.

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