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STC89LE52RC 数据表(PDF) 110 Page - STCmicro Technology Co,.Ltd |
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STC89LE52RC 数据表(HTML) 110 Page - STCmicro Technology Co,.Ltd |
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110 / 165 page  SCON register LSB bit B7 B6 B5 B4 B3 B2 B1 B0 name SM0/FE SM1 SM2 REN TB8 RB8 TI RI FE: Framing Error bit. The SMOD0 bit must be set to enable access to the FE bit 0: The FE bit is not cleared by valid frames but should be cleared by software. 1: This bit set by the receiver when an invalid stop bit id detected. SM0,SM1 : Serial Port Mode Bit 0/1. SM0 SM1 Description Baud rate 0 0 8-bit shift register SYSclk/12 0 1 8-bit UART variable 1 0 9-bit UART SYSclk/64 or SYSclk/32(SMOD=1) 1 1 9-bit UART variable SM2 : Enable the automatic address recognition feature in mode 2 and 3. If SM2=1, RI will not be set unless the received 9th data bit is 1, indicating an address, and the received byte is a Given or Broadcast address. In mode1, if SM2=1 then RI will not be set unless a valid stop Bit was received, and the received byte is a Given or Broadcast address. In mode 0, SM2 should be 0. REN : When set enables serial reception. TB8 : The 9th data bit which will be transmitted in mode 2 and 3. RB8 : In mode 2 and 3, the received 9th data bit will go into this bit. TI : Transmit interrupt flag. RI : Receive interrupt flag. SBUF register LSB bit 7654321 0 name It is used as the buffer register in transmission and reception. The serial port buffer register (SBUF) is really two buffers. Writing to SBUF loads data to be transmitted, and reading SBUF accesses received data. These are two separate and distinct registers, the transimit write-only register, and the receive read-only register. PCON: Power Control register LSB bit B7 B6 B5 B4 B3 B2 B1 B0 name SMOD SMOD0 - POF GF1 GF0 PD IDL SMOD: double Baud rate control bit. 0 : Disable double Baud rate of the UART. 1 : Enable double Baud rate of the UART in mode 1,2,or 3. SMOD0: Frame Error select. 0 : SCON.7 is SM0 function. 1 : SCON.7 is FE function. Note that FE will be set after a frame error regardless of the state of SMOD0. 110 |
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