MCS-51 serial interface related function registers-EEWORLD

Collect

1) Serial port control register SCON

bits: SM0 SM1 SM2 REN TB8 RB8 TI RI

SM0, SM1: Mode selection

SM2 is used for multi-machine communication. When SM2=1, if the received 9th bit RB8 is 1, RI=1; when SM2=0, whether the received 9th bit is 0 or 1, RI=1.

2) Power control register PCON

bits: SMOD - - - GF1 GF0 PD IDL

The only bit related to the serial port is SMOD. When this bit = 1, the baud rate is doubled. The remaining 4 bits are related to power control.

3) Serial receive/transmit data buffer register SBUF (99H)

is actually two registers sharing the same address.

Keywords：MCS-51 Reference address：MCS-51 serial interface related function registers

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