9th bit in the 9 bit transmission mode is commonly used as parity bit. Bit 6 TX9 : When this bit is set it enables the 9 bit transmission otherwise 8 bit transmission is used.In the synchronous mode operation CREN and SREN bits of RCSTA register overrides this bit. Bit 5 TXEN : Setting this bit enables the transmission.Setting this bit selects Synchronous mode while clearing this bit selects Asynchronous mode. Bit 4 SYNC : This is the USART Mode select bit.Bit 3 Unimplemented : This bit is unimplemented and will read as 0.You will can see the baud rate calculation later in this article. Setting this bit selects High Speed and clearing this bit selects Low Speed baud rates. Bit 2 BRGH : This is the High Baud Rate Select bit for Asynchronous mode operation and is unused in Synchronous mode.When the TRS is empty this bit is set and when the TSR is full this bit will be 0. This can be used to check whether the data written to transmit register is transmitted or not. Bit 1 TRMT : This is the Transmit Shift Register (TSR) status bit.Bit 0 TX9D : This is the 9th bit of data in the 9 bit transmission mode which is commonly used as a Parity Bit.PIC 16F877A USART Module USART Registers TXSTA – Transmit Status and Control Register TXSTA – Transmit Status and Control Register For demonstration we are using PIC 16F877A microcontroller. In this tutorial we will learn how to use UART Mode of USART Module using MPLAB XC8 Compiler.
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