BITWAIT

Action

Wait until a bit is set or reset.

 

 

Syntax

BITWAIT x , SET/RESET

 

 

Remarks

X	Bit variable or internal register like PORTB.x , where x ranges from 0-7.

 

When using bit variables make sure that they are set/reset by software otherwise your program will stay in a loop.

 

When you use internal registers that can be set/reset by hardware such as PINB.0 this doesn't apply since this state can change as a result from for example a key press.

 

 

 

See also

NONE

 

 

ASM

Calls: NONE

Input: NONE

Output: NONE

 

Code : shown for address 0-31

 

 

label1:

Sbic PINB.0,label2

Rjmp label1

Label2:

 

 

Example

$regfile = "m48def.dat" ' specify the used micro
$crystal = 8000000 ' used crystal frequency
$baud = 19200 ' use baud rate
$hwstack = 32 ' default use 32 for the hardware stack
$swstack = 10 ' default use 10 for the SW stack
$framesize = 40 ' default use 40 for the frame space
 
Config Com1 = Dummy , Synchrone = 0 , Parity = None , Stopbits = 1 , Databits = 8 , Clockpol = 0
 
Dim A As Bit
Bitwait A , Set 'wait until bit a is set
'the code above will loop forever since the bit 'A' is not set in software
'it could be set in an ISR routine
 
Bitwait Pinb.7 , Reset 'wait until bit 7 of Port B is 0.
End

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