| ??? 02/14/10 01:12 Read: times |
#173145 - tied EA high still no luck Responding to: ???'s previous message |
I also changed the code to simple , just set and clear port p2.7 every 2 secs , but something is not working.
$MOD51
;
; The processor clock speed is 11.059MHz
; Cycle time is 1.1ms
input_port equ p2.0
output_port equ p2.7
org 00
ljmp main
org 100h
main:
loop: setb output_port ;port 2.7 should blink
lcall wait_2s
clr output_port
sjmp loop
;---------------------- delay routines ----------------------------------
wait_2s:
mov r5,#20
b1: lcall wait_135ms
djnz r5,b1
ret
wait_135ms:
mov r2,#255 ;1x1.04us
mov r3,#255 ;1x1.04us
loop1: djnz r3,loop1 ;250X10x2.07us
mov r3,#255 ;10x1.04us
djnz r2,loop1 ;10x2.07us
ret ;
;------------------------- end delay -----------------------------------
end
|
| Topic | Author | Date |
| problems programming the P89V51 | 01/01/70 00:00 | |
| here is the schematic I am following | 01/01/70 00:00 | |
| EA | 01/01/70 00:00 | |
| tied EA high still no luck | 01/01/70 00:00 | |
PROBLEM FIXED - Working now | 01/01/70 00:00 |