PIC16C65B-04E/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C65B-04E/SO

8-Bit CMOS Microcontrollers with A/D Converter

Microchip Technology 

PIC16C63A/65B/73B/74B

11.0 ADDRESSABLE 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)

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 asynchro-

nous receiver transmitter.

REGISTER 11-1:

TXSTA: TRANSMIT STATUS AND CONTROL REGISTER (ADDRESS 98h)

R/W-0 R/W-0 R/W-0 R/W-0

U-0

R/W-0

R-1

R/W-0

CSRC

TX9

TXEN SYNC

—

BRGH TRMT TX9D

bit 7

bit 0

bit 7

CSRC: Clock Source Select bit

Asynchronous mode:

Don’t care

Synchronous mode:

1 = Master mode (Clock generated internally from BRG)

0 = Slave mode (Clock from external source)

bit 6

TX9: 9-bit Transmit Enable bit

1 = Selects 9-bit transmission

0 = Selects 8-bit transmission

bit 5

TXEN: Transmit Enable bit

1 = Transmit enabled

0 = Transmit disabled

Note: SREN/CREN overrides TXEN in SYNC mode.

bit 4

SYNC: USART Mode Select bit

1 = Synchronous mode

0 = Asynchronous mode

bit 3

Unimplemented: Read as '0'

bit 2

BRGH: High Baud Rate Select bit

Asynchronous mode:

1 = High speed

0 = Low speed

Synchronous mode:

Unused in this mode

bit 1

TRMT: Transmit Shift Register Status bit

1 = TSR empty

0 = TSR full

bit 0

TX9D: 9th bit of Transmit Data. Can be parity bit.

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

’1’ = Bit is set

U = Unimplemented bit, read as ‘0’

’0’ = Bit is cleared x = Bit is unknown

 2000 Microchip Technology Inc.

DS30605C-page 65

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