Comparison of 51 MCU C and assembly instructions-EEWORLD

Collect

1. Single instruction comparison:

Byte Operations

Addition instruction

Subtraction Instructions

Multiplication Instructions

Division Instructions

Modulo instruction

Bit Test Instructions

_testbit_ (bit);

Left shift instruction

Variable = Variable << 1;

Right shift instruction

Variable = Variable >> 1;

Bit Invert Instruction

AND instruction

OR instruction

XOR instruction

Subroutine call

RESULT=BYTESUB(ARG1, ARG2);

CALL BYTESUB

Judgment Instructions

CJNE R1,#0F0H,LABEL1

DJNZ R1,LABEL1

Table Lookup Instructions

RESULT = NUM[index];

MOVC A,@A+DPTR

Pointer operation instructions

POINT = & NUM;

RESULT = *POINT

2. Pseudo-instructions

Start Instructions

Interrupt entry vector

void timer0(void)interrupt 1 using 1

Variable definitions

unsigned char code tab[]={0x01,0x02,0x03,0x04};

3. Differences in program calls

Unsigned char BYTESUB(ARG1,ARG2) //input ARG1,ARG2;output the result

{

}

……

RESULT=BYTESUB(ARG1,ARG2);

……

CALL BYTESUB

……

;INPUT: A,B

;OUTPUT: A

4. Differences in interrupt handling:

void timer0(void)interrupt 1 using 1 // Enable TC0 interrupt, interrupt number 1, use register group 1.

{

}

ORG 0BH

LJMP TC0ISR

TC0ISR:

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