Unresolved Operand(s)

[lemon101]

Hello guys, I'm new to this forum, however its seems pretty cool. I am having a little trouble with some code I pulled straight from Mazidi's book on the 8051 microcontroller:

ORG
MOV A,#38H ; init. LCD 2 lines, 5x7 matrix
ACALL COMNWRT ; call command subroutine
ACALL DELAY ; give LCD some time
MOV A,#0EH ; display on, cursor on
ACALL COMNWRT ; call command subroutine
ACALL DELAY ; give LCD some time
MOV A,#01 ; clear LCD
ACALL COMNWRT ; call command subroutine
ACALL DELAY ; give LCD some time
MOV A,#06H ; shift cursor right
ACALL COMNWRT ; call command subroutine
ACALL DELAY ; give LCD some time
MOV A,#84H ; cursor at line 1, pos. 4
ACALL COMNWRT ; call command subroutine
ACALL DELAY ; give LCD some time
MOV A,#'N' ; display letter N
ACALL DATAWRT ; call display subroutine
ACALL DELAY ; give LCD some time
MOV A,#'O' ; display letter O
ACALL DATAWRT ; call display subroutine
AGAIN: SJMP AGAIN ; stay here
COMNWRT: ; send command to LCD
MOV P1,A ; copy reg A to port 1
CLR P2.0 ; RS = 0 for command
CLR P2.1 ; R/W = 0 for write
SETB P2.2 ; E = 1 for high pulse
CLR P2.2 ; E = 0 FOR H-to-L pulse
RET
DATAWRT: ; write data to LCD
MOV P1,A ; copy reg A to port 1
SETB P2.0 ; RS = 1 for data
CLR P2.1 ; R/W = 0 for write
SETB P2.2 ; E = 1 for high pulse
CLR P2.2 ; E = 0 FOR H-to-L pulse
RET
DELAY: MOV R3,#50 ; 50 or higher for fast CPUs
HERE2: MOV R4,#255 ; R4 = 255
HERE: DJNZ R4,HERE ; stay until R4 becomes 0
DJNZ R3,HERE2
RET
END

I put this code into Rigel's Reads51 IDE. When I try to compile/build it using the Reads51 v4 Toolchain I get errors wherever I put anything to do with PORTS (P1, P2.0, etc). These errors are listed as "Unresolved Operand(s)".

However when I try to compile/build the code with the Reads51 v3 Toolchain, the IDE gives no errors.

This is really weird and I'm pretty puzzled by this. Can anyone shed some light on this?

 

[zeitghost]

To state the obvious, sounds like you have something undefined in the Reads51 toolchain.

You might try posting the actual error messages.

Please used the

tags when posting code.

 

[lemon101]

Sorry about not using the tag there, didn't realise it was available. I get the following errors in Reads51 under the v4 Toolchain:

"C:\LCD-Commands and data with time delay.asm"        8    Undecodable line, Syntax error
"C:\LCD-Commands and data with time delay.asm"       30    Unresolved operand(s)
"C:\LCD-Commands and data with time delay.asm"       31    Unresolved operand(s)
"C:\LCD-Commands and data with time delay.asm"       32    Unresolved operand(s)
"C:\LCD-Commands and data with time delay.asm"       33    Unresolved operand(s)
"C:\LCD-Commands and data with time delay.asm"       34    Unresolved operand(s)
"C:\LCD-Commands and data with time delay.asm"       37    Unresolved operand(s)
"C:\LCD-Commands and data with time delay.asm"       38    Unresolved operand(s)
"C:\LCD-Commands and data with time delay.asm"       39    Unresolved operand(s)
"C:\LCD-Commands and data with time delay.asm"       40    Unresolved operand(s)
"C:\LCD-Commands and data with time delay.asm"       41    Unresolved operand(s)

 

[zeitghost]

And these line numbers correspond to the code you originally posted?