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STC89LE52RC 数据表(PDF) 109 Page - STCmicro Technology Co,.Ltd |
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STC89LE52RC 数据表(HTML) 109 Page - STCmicro Technology Co,.Ltd |
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109 / 165 page  Chapter 8 UART with enhanced function The serial port of STC89xx series is full duplex, meaning it can transmit and receive simultaneously. It is also receive-buffered, meaning it can commence reception of a second byte before a previously received byte has been read from the reeeive register. (However,if the first byte still hasn’t been read by the time reception of the second byte is complete, one of the bytes will be lost). The serial port receive and transmit share the same SFR – SBUF, but actually there is two SBUF registers in the chip, one is for transmit and the other is for receive. The serial port can be operated in 4 different modes: Mode 0 provides synchronous communication while Modes 1, 2, and 3 provide asynchronous communication. The asynchronous communication operates as a full-duplex Universal Asynchronous Receiver and Transmitter (UART), which can transmit and receive simultaneously and at different baud rates. Serial communiction involves the transimission of bits of data through only one communication line. The data are transimitted bit by bit in either synchronous or asynchronous format. Synchronous serial communication transmits ont whole block of characters in syschronization with a reference clock while asynchronous serial communication randomly transmits one character at any time, independent of any clock. Symbol Description Address Bit Address and Symbol MSB LSB Value after Power-on or Reset SCON Serial Control 98H SM0/FE SM1 SM2 REN TB8 RB8 TI RI 0000 0000B SBUF Serial Buffer 99H xxxx xxxxB PCON Power Control 87H SMOD SMOD0 - POF GF1 GF0 PD IDL 00x1 0000B IE Interrupt Enable A8H EA - ET2 ES ET1 EX1 ET0 EX0 0000 0000B IP Interrupt Priority Low B8H - - PT2 PS PT1 PX1 PT0 PX0 xx00 0000B IPH Interrupt Priority High B7H PX3H PX2H PT2H PSH PT1H PX1H PT0H PX0H 0000 0000B SADEN Slave Address Mask B9H 0000 0000B SADDR Slave Address A9H 0000 0000B 109 |
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