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// page no 453
// example no 15.2
// BSR CONTROL WORD SUBROUTINE
clc;
printf('BSR Control Words \n \n');
printf('D7 D6 D5 D4 D3 D2 D1 D0 \n');
printf('0 0 0 0 1 1 1 1 = 0FH To set bit PC7 \n');
printf('0 0 0 0 1 1 1 0 = 0EH To reset bit PC7 \n');
printf('0 0 0 0 0 1 1 1 = 07H To set bit PC3 \n');
printf('0 0 0 0 0 1 1 0 = 06H To reset bit PC3 \n \n');
printf('Port Address \n \n');
printf('Control Register Address = 83H \n \n');
printf('Subroutine \n \n');
printf('MVI A,0FH \n'); // load byte in accumulator to set PC7
printf('OUT 83H \n'); // set PC7=1
printf('MVI A,07H \n'); // load byte in accumulator to set PC3.
printf('OUT 83H \n'); // set PC3=1.
printf('CALL DELAY \n'); // this is a 10 microsec delay.
printf('MVI A,06H \n'); // load byte in accumulator to reset PC3
printf('OUT 83H \n'); // reset PC3
printf('MVI A,0EH \n'); // load byte in accumulator to reset PC7.
printf('OUT 83H \n'); // reset PC7
printf('RET');
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