PIC to PIC Communication using USART - MikroC.pdf

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Tutorials PIC Microcontroller MikroC PIC to PIC Communication using USART

PIC to PIC Communication using USART20

Posted By Ligo George

3 Jul 2012 | MikroC PIC Microcontroller Tutorials

Tags: Microcontroller MikroC PIC Proteus USART

USART Universal Synchronous AsynchronousReceiver TransmitterUSART is the most commonly used serial I/O module. It is also known as Serial

Communications Interface (SCI). USART can be easily configured as a full-duplex

asynchronous communication system that can communicate with peripheral devices, such

as personal computers and CRT terminals, or it can be configured as a half-duplex

synchronous communication system that can communicate with peripheral devices, such as

serial EEPROMs, A/D or D/A integrated circuits, etc. USART can be configured in the

following modes.

Synchronous Master Half Duplex

Synchronous Slave Half Duplex

Asynchronous Full Duplex

We dont want to bother about configuring registers as MikroC Pro for PIC Microcontrollers

have built-in library function to handle asynchronous communication.

Pic Mikroc Serial Port Protocol

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Registers of USARTTo use the USART of PIC 16F877A Microcontroller, the following registers must be

configured. But when using MikroC we dont want to bother about it.

TXSTA : TRANSMIT STATUS AND CONTROL REGISTER

TXSTA Register PIC Microcontroller

CSRC : Clock Source Select

Asynchronous Mode

Dont care.

Synchronous Mode

1 Master Mode (clock generated internally)

0 Slave Mode (clock from external source)

TX9 : 9-bit Transmit Enable

1 9-bit transmission

0 8-bit transmission

TXEN : Transmit Enable

1 Transmit Enabled

0 Transmit Disabled

SREN/CREN (in RCSTA register) overrides TXEN in Sync mode.

SYNC : USART Mode Select

1 Synchronous Mode

0 Asynchronous Mode

BRGH : High Baud Rate Select

Asynchronous Mode

1 High speed

0 Low speed

Synchronous Mode

Not Used

TRMT : Transmit Shift Register Status

1 Transmit Status Register empty

0 TSR full

TX9D : 9th bit of Transmit Data or Parity bit

RCSTA : RECEIVE STATUS AND CONTROL REGISTER

RCSTA Register PIC Microcontroller

SPEN : Serial Port Enable

0

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0

0

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1 Serial port is enabled

0 Serial port is disabled

RX9 : 9-bit Receive Enable

1 Sets 9-bit reception

0 Sets 8-bit reception

SREN : Single Receive Enable

Asynchronous Mode

Not Used.

Synchronous Master Mode

1 Enables single receive

0 Disables single receive

This bit will be cleared after reception.

Synchronous Slave Mode

Not Used.

CREN : Continuous Receive Enable

Asynchronous Mode

1 Enables continuous receive

0 Disables continuous receive

Synchronous Mode

1 Enables continuous receive till enable bit CREN is cleared (Note : CREN overrides

SREN)

0 Disables continuous receive

ADDEN : Address Detect Enable

Asynchronous 9-bit Mode

1 Enables address detection

0 Disables address detection

FERR : Framing Error

1 Framing error

0 No framing error

OERR : Overrun Error

1 Overrun error

0 No overrun error

RX9D : 9th bit or Parity Bit of Received Data

Now I am not writing about configuring these registers as MikroC Pro for PIC

Microcontroller has built in function to handle Asynchronous Communication.

Mikroc Serial Port Protocol You Pic



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PIC to PIC Communication using USART - MikroC.pdf

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