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SFR explanation for PIC16F873(16)
TXSTA ( Transmit Status and Control Register ) 98h This register controls USART transmit function. The value in the parenthesis is in the condition immediately after the turning on.
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 )
TX9 : 9-bit Transmit Enable bit
| 1 | : | Selects 9-bit transmission
0 | : | Selects 8-bit transmission
TXEN : Transmit Enable bit
| 1 | : | Transmit enable
0 | : | Transmit disable
SREN/CREN of RCSTA register overrides TXEN in SYNC mode
SYNC : USART Mode Select bit
| 1 | : | Synchronous mode
0 | : | Asynchronous mode
BRGH : High Baud Rate Select bit
Asynchronous mode
| 1 | : | High speed
0 | : | Low speed
Synchronous mode Unused in this mode
TRMT : Transmit Shift Register Status bit ( Read only )
| 1 | : | TSR empty
0 | : | TSR full
TX9D : 9th bit of transmit data. Can be parity bit.