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???
01/08/11 06:33
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 		 #180486 - lcd EN signal
Responding to: ???'s previous message
Hello,

According to the tutorial on 8052.com regarding LCD programming, the EN bit should be manipulated repeatedly.

Therefore should the EN bit be cleared after every instruction/command execution.

EG: If data is sent for display

CLEARING THE ENABLE
setb RS
clr RW
clr EN
mov P1,A
setb EN
lcall en_wait
clr EN
lcall lcd_wait
RET

WITHOUT CLEARING

setb RS
clr RW
mov P1,A
setb EN
lcall en_wait
clr EN
lcall lcd_wait
RET

Does it make any difference to clear it before or not? the above two types are nothing but confusion in my logic !

Thanking You

Karan Verma



List of 45 messages in thread
TopicAuthorDate
JHD162A lcd            01/01/70 00:00      
   5V LCD            01/01/70 00:00      
      in addition !            01/01/70 00:00      
         Matching output voltages with input requirements            01/01/70 00:00      
         C8051F120 has 5V tolerant Input/Output pins            01/01/70 00:00      
            Yes i have...            01/01/70 00:00      
            careful            01/01/70 00:00      
               what are...            01/01/70 00:00      
                  Powered components            01/01/70 00:00      
                     Thank You            01/01/70 00:00      
                  examples            01/01/70 00:00      
               active level converters            01/01/70 00:00      
                  Resistors not good way to reduce voltage            01/01/70 00:00      
                     Thank You...            01/01/70 00:00      
                     Per forgot one thing            01/01/70 00:00      
                        R*C            01/01/70 00:00      
                           delay            01/01/70 00:00      
            5V and micro and LCD            01/01/70 00:00      
   potentiometer            01/01/70 00:00      
      Film Capacitor??            01/01/70 00:00      
         thank you so much            01/01/70 00:00      
      SIL resistor            01/01/70 00:00      
         new delhi            01/01/70 00:00      
            Actually, it seems that they *do* know!            01/01/70 00:00      
         SIL Residtor *network*            01/01/70 00:00      
            correction...Yes they do know            01/01/70 00:00      
   Port I/O pin voltage            01/01/70 00:00      
      "5V-Tolerant" pins - already answered            01/01/70 00:00      
      5V tolerant, not 5V            01/01/70 00:00      
         Thank You            01/01/70 00:00      
            Maybe you can "get by" with this ...            01/01/70 00:00      
               "Absolute Maximum Limits" are not Operating conditions            01/01/70 00:00      
                  That's true, it's an absolute maximum/minimum            01/01/70 00:00      
                     Agree            01/01/70 00:00      
               3V3 logic runs at "TTL levels"            01/01/70 00:00      
                  The HD44780 claims to respond to TTL levels ... but ...            01/01/70 00:00      
   pull up resistor            01/01/70 00:00      
      do not tie a pin to gnd            01/01/70 00:00      
      many pull-ups            01/01/70 00:00      
         Do you mean...?            01/01/70 00:00      
      one more thing ...            01/01/70 00:00      
   high impedence            01/01/70 00:00      
   lcd EN signal            01/01/70 00:00      
      It is a pre-clear            01/01/70 00:00      
         Thank You            01/01/70 00:00      

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