May 2024
Intermediate to advanced
534 pages
17h 58m
English
book
8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
by Subrata Ghoshal
Content preview from 8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
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89
C-version
#include <regx51.h>
void main(void)
{
unsigned char *pRamLoc, *pLoc6BH;
unsigned char nullByteCnt=0;
pLoc6BH = 0x6B;
for (pRamLoc=0x6C, nullByteCnt=0; pRamLoc<=0x7F; pRamLoc++)
{
if (0==*pRamLoc)
{
nullByteCnt += 1;
}
}
*pLoc6BH = nullByteCnt;
while(1);
}
7.5 | FIND CHECKSUM
An alternate method would be to use JZ or JNZ instruction after assigning another register
as the counter. However, as we are interested in application of CJNE instruction, therefore
we follow the present method.
7.5 | Find Checksum
Example 7.4
Purpose: Multiple additions through indirect addressing mode.
Problem
Sixteen consecutive bytes starting from 50H have ...
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