The 8051 Microcontroller and Embedded Systems, Volume 1
For courses teaching the 8051 Microcontoller.
This book uses a step-by-step approach to teach the fundamentals of assembly language programming and interfacing of the 8051 microcontroller. It uses many examples to clarify concepts. Simple, concise examples are utilized to show what action each instruction performs, then a sample is provided to show its application. This text provides a comprehensive understanding of the internal organization of the 8051 registers and resources in a way that sheds the student's fear of assembly language. Whether students become designers of stand-alone systems or complex embedded systems, they will find this text a useful resource.
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Receive interrupt flag . Set by hardware halfway through the stop bit time in mode 1. Must be cleared by software . RI SCON.O Note : Make SM2 , TB8 , and RB8 = 0 . Figure 10-9 . SCON Serial Port Control Register ( Bit Addressable ) SMO ...
The RI flag bit is monitored with the use of the instruction “ JNB RI , XX ” to see if an entire character has been received yet . 7. When RI is raised , SBUF has the byte . Its contents are moved into a safe place . 8.
5 Receive clock flag . When set , causes the Serial Port to use Timer 2 overflow pulses for its receive clock in modes 1 & 3. RCLK O causes Timer I overflow to be used for the receive clock . TLCK T2CON . 4 Transmit clock nag .
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The 8051 Microcontrollers
8051 ASSEMBLY LANGUAGE PROGRAMMING
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