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MOV PORT, A not working appropriately.

Eduardo Reis

I'm running this code:

;; Test 8 operations
MOV R0,#08
LOOP: MOV A,P2
JB P1.1, L
RR A
JMP CONT
L: RL A
CONT: MOV P2,A
MOV P2,A
DJNZ R0,LOOP
END

And when I execute (MOV P2,A) it just moves to the latch, not to the pins. So that when I read it again I'll a wrong result.

Parents
  • 0 in reply to ImPer Westermark

    This is my Keil info:

    IDE-Version:
    µVision V4.72.9.0
    Copyright (C) 2013 ARM Ltd and ARM Germany GmbH. All rights reserved.

    License Information:
    eduardo reis
    home
    LIC=----

    Tool Version Numbers:
    Toolchain: PK51 Prof. Develpers Kit Version: 9.52.0.0
    Toolchain Path: C:\Keil\C51\BIN
    C Compiler: C51.Exe V9.52.0.0
    Assembler: A51.Exe V8.02b
    Linker/Locator: BL51.Exe V6.22
    Librarian: LIB51.Exe V4.29
    Hex Converter: OH51.Exe V2.7.0.0
    CPU DLL: S8051.DLL V3.91.0.0
    Dialog DLL: DP51.DLL V2.62.0.1

    The target is:
    AT89C52

    And my ASM file is just that one.

    I just had this exercise: read from one port, rotate according to a pin from another port.

    What is weird is that in another project/ exercice. This one:

    ORG 0000
    JMP 0100
    ORG 0100

    LOOP3: MOV R0,#7
    LOOP1: CLR C
    MOV A,P1
    RRC A
    MOV P1,A ;It works here
    DJNZ R0,LOOP1

    MOV R0,#7
    LOOP2: CLR C
    MOV A,P1
    RLC A
    MOV P1,A ;but not here
    DJNZ R0,LOOP2

    END

Reply
  • 0 in reply to ImPer Westermark

    This is my Keil info:

    IDE-Version:
    µVision V4.72.9.0
    Copyright (C) 2013 ARM Ltd and ARM Germany GmbH. All rights reserved.

    License Information:
    eduardo reis
    home
    LIC=----

    Tool Version Numbers:
    Toolchain: PK51 Prof. Develpers Kit Version: 9.52.0.0
    Toolchain Path: C:\Keil\C51\BIN
    C Compiler: C51.Exe V9.52.0.0
    Assembler: A51.Exe V8.02b
    Linker/Locator: BL51.Exe V6.22
    Librarian: LIB51.Exe V4.29
    Hex Converter: OH51.Exe V2.7.0.0
    CPU DLL: S8051.DLL V3.91.0.0
    Dialog DLL: DP51.DLL V2.62.0.1

    The target is:
    AT89C52

    And my ASM file is just that one.

    I just had this exercise: read from one port, rotate according to a pin from another port.

    What is weird is that in another project/ exercice. This one:

    ORG 0000
    JMP 0100
    ORG 0100

    LOOP3: MOV R0,#7
    LOOP1: CLR C
    MOV A,P1
    RRC A
    MOV P1,A ;It works here
    DJNZ R0,LOOP1

    MOV R0,#7
    LOOP2: CLR C
    MOV A,P1
    RLC A
    MOV P1,A ;but not here
    DJNZ R0,LOOP2

    END

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