bonasx.blogg.se - Saving input from serial uart embedded c program

In fact, this process starts after any instruction being performed upon this register.

Transmission – Data transmit is initiated by writing data to the SBUF register.

On transmit, the least significant bit (LSB bit) is sent/received first. The baud rate is fixed at 1/12 the oscillator frequency. In mode 0, serial data are transmitted and received through the RXD pin, while the TXD pin output clocks. This bit is also cleared from within the software. It signals that byte is received and should be read quickly prior to being replaced by new data.

RI – Receive Interrupt flag is automatically set upon one byte to receive.

It must be cleared from within the software. It’s a signal to the processor that the line is available for a new byte to transmit.

TI – Transmit Interrupt flag is automatically set at the moment the last bit of one byte is sent.

Set by hardware if 9th bit received is a logic 1. Cleared by hardware if 9th bit received is a logic 0. RB8 – Receiver bit 8 or the 9th bit received in modes 2 and 3.It is set to transmit a logic 1 in the 9th bit. Since all registers are 8-bit wide, this bit solves the problem of transmitting the 9th bit in modes 2 and 3. When cleared, serial reception is disabled. REN – Reception Enable bit enables serial reception when set.When set, it enables multiprocessor communication in mode 2 and 3, and eventually mode 1. SM2 – This bit is used for serial port mode selection, also known as multiprocessor communication enable bit.

SM1 – This bit is used for serial port mode selection.SM0 – This bit is used for serial port mode selection.