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. |
From inside the book
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Page 115
... SUBB ( subtract with borrow ) . In the 8051 we have only SUBB . To make SUB out of SUBB , we have to make CY = 0 prior to the execution of the instruction . Therefore , there are two cases for the SUBB instruction : ( 1 ) with CY 0 ...
... SUBB ( subtract with borrow ) . In the 8051 we have only SUBB . To make SUB out of SUBB , we have to make CY = 0 prior to the execution of the instruction . Therefore , there are two cases for the SUBB instruction : ( 1 ) with CY 0 ...
Page 116
... SUBB A , 6EH " : 4C 0100 1100 - 6E 0110 1110 -22 0100 1100 2's comp = 1001 0010 01101 1110 CY = 1 , the result is negative , in 2's complement . SUBB ( subtract with borrow ) when CY = 1 This instruction is used for multibyte numbers ...
... SUBB A , 6EH " : 4C 0100 1100 - 6E 0110 1110 -22 0100 1100 2's comp = 1001 0010 01101 1110 CY = 1 , the result is negative , in 2's complement . SUBB ( subtract with borrow ) when CY = 1 This instruction is used for multibyte numbers ...
Page 426
... SUBB MUL CJNE A. SWAP DA CLR AB A , #data CPL AB #data , rel A A [ 2B , 4C ] [ 28 ] Α A [ 4C ] [ 3B , 2C ] MOV SUBB CJNE XCH DJNZ MOV MOV 5 dir , dir A , dir A , dir , rel A , dir dir , rel A , dir dir , A ( 3B , 2C ) ( 2B ) ( 3B ...
... SUBB MUL CJNE A. SWAP DA CLR AB A , #data CPL AB #data , rel A A [ 2B , 4C ] [ 28 ] Α A [ 4C ] [ 3B , 2C ] MOV SUBB CJNE XCH DJNZ MOV MOV 5 dir , dir A , dir A , dir , rel A , dir dir , rel A , dir dir , A ( 3B , 2C ) ( 2B ) ( 3B ...
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