The 8051 Microcontroller and Embedded Systems, Volume 1For 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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Page 50
... carry bit . The flag register in the 8051 is called the program status word ( PSW ) register . In this section we discuss various bits of this register and provide some ... flag is set whenever 50 6: 8051 Flag Bits and the PSW Register.
... carry bit . The flag register in the 8051 is called the program status word ( PSW ) register . In this section we discuss various bits of this register and provide some ... flag is set whenever 50 6: 8051 Flag Bits and the PSW Register.
Page 51
Muhammad Ali Mazidi, Janice Gillispie Mazidi. CY , the carry flag This flag is set whenever there is a carry out from the d7 bit . This flag bit is affected after an 8 - bit addition or subtraction . It can also be set to 1 or 0 ...
Muhammad Ali Mazidi, Janice Gillispie Mazidi. CY , the carry flag This flag is set whenever there is a carry out from the d7 bit . This flag bit is affected after an 8 - bit addition or subtraction . It can also be set to 1 or 0 ...
Page 135
... carry flag , and the carry flag enters the MSB . In other words , in RRC A the LSB is moved to CY and CY is moved to the MSB . In reality , the carry flag acts as if it is part of register A , making it a 9 - bit register . CLR C MOV ...
... carry flag , and the carry flag enters the MSB . In other words , in RRC A the LSB is moved to CY and CY is moved to the MSB . In reality , the carry flag acts as if it is part of register A , making it a 9 - bit register . CLR C MOV ...
Contents
CHAPTERS | 1 |
The 8051 Microcontrollers | 23 |
THE 8051 MICROCONTROLLERS 2323 Section 1 1 Microcontrollers and Embedded Processors | 24 |
Copyright | |
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Other editions - View all
The 8051 Microcontroller And Embedded Systems Using Assembly And C, 2/E Muhammad Ali Mazidi,Mazidi No preview available - 2007 |
Common terms and phrases
ACALL ACALL DELAY addr addressing mode ASCII Assembly language baud rate binary bit addresses carry flag Chapter CJNE connected convert data pins decimal decoder discussed DJNZ DPTR EPROM Example execution external interrupt Figure flag bit frequency I/O ports instruction INT1 Intel interfacing interrupt vector table jump latch LCALL LJMP load logic loop machine cycle memory chip memory location microcontroller microprocessor MOV P1 MOV RO MOVX Notice NV-RAM on-chip ROM opcode operand output pointer program counter PSEN pull-up resistors pulse RAM location register bank reset Review Questions SBUF SECTION serial communication SETB TR1 Show signal SJMP Solution square wave stack stepper motor stop bit SUBB subroutine target address TCON timer Timer/counter TMOD transistors True or false voltage Write a program