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Help me with Assembly syntax of MOV

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mohamed saleh

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What is the meaning of the following syntax in assembly




$MOD51

$NOPAGING

$LIST

Mov 2,#145
( i know the meaning of "MOV A,#25h" for example, but what is 2 and 145 in "MOV 2,#145" )
 

Re: Assembly help

mov 2,#45
(2) here means the register that have the address 2.

'List' is a complier directive as I think
 

Re: Assembly help

Below is the contens of the MOD51 file:
Code: 
TL0    DATA  08AH  ;TIMER 0 - LOW BYTE
TL1    DATA  08BH  ;TIMER 1 - LOW BYTE
TH0    DATA  08CH  ;TIMER 0 - HIGH BYTE
TH1    DATA  08DH  ;TIMER 1 - HIGH BYTE
P1     DATA  090H  ;PORT 1
SCON   DATA  098H  ;SERIAL PORT CONTROL
SBUF   DATA  099H  ;SERIAL PORT BUFFER
P2     DATA  0A0H  ;PORT 2
IE     DATA  0A8H  ;INTERRUPT ENABLE
P3     DATA  0B0H  ;PORT 3
IP     DATA  0B8H  ;INTERRUPT PRIORITY
PSW    DATA  0D0H  ;PROGRAM STATUS WORD
ACC    DATA  0E0H  ;ACCUMULATOR
B      DATA  0F0H  ;MULTIPLICATION REGISTER
IT0    BIT   088H  ;TCON.0 - EXT. INTERRUPT 0 TYPE
IE0    BIT   089H  ;TCON.1 - EXT. INTERRUPT 0 EDGE FLAG
IT1    BIT   08AH  ;TCON.2 - EXT. INTERRUPT 1 TYPE
IE1    BIT   08BH  ;TCON.3 - EXT. INTERRUPT 1 EDGE FLAG
TR0    BIT   08CH  ;TCON.4 - TIMER 0 ON/OFF CONTROL
TF0    BIT   08DH  ;TCON.5 - TIMER 0 OVERFLOW FLAG
TR1    BIT   08EH  ;TCON.6 - TIMER 1 ON/OFF CONTROL
TF1    BIT   08FH  ;TCON.7 - TIMER 1 OVERFLOW FLAG
RI     BIT   098H  ;SCON.0 - RECEIVE INTERRUPT FLAG
TI     BIT   099H  ;SCON.1 - TRANSMIT INTERRUPT FLAG
RB8    BIT   09AH  ;SCON.2 - RECEIVE BIT 8
TB8    BIT   09BH  ;SCON.3 - TRANSMIT BIT 8
REN    BIT   09CH  ;SCON.4 - RECEIVE ENABLE
SM2    BIT   09DH  ;SCON.5 - SERIAL MODE CONTROL BIT 2
SM1    BIT   09EH  ;SCON.6 - SERIAL MODE CONTROL BIT 1
SM0    BIT   09FH  ;SCON.7 - SERIAL MODE CONTROL BIT 0
EX0    BIT   0A8H  ;IE.0 - EXTERNAL INTERRUPT 0 ENABLE
ET0    BIT   0A9H  ;IE.1 - TIMER 0 INTERRUPT ENABLE
EX1    BIT   0AAH  ;IE.2 - EXTERNAL INTERRUPT 1 ENABLE
ET1    BIT   0ABH  ;IE.3 - TIMER 1 INTERRUPT ENABLE
ES     BIT   0ACH  ;IE.4 - SERIAL PORT INTERRUPT ENABLE
EA     BIT   0AFH  ;IE.7 - GLOBAL INTERRUPT ENABLE
RXD    BIT   0B0H  ;P3.0 - SERIAL PORT RECEIVE INPUT
TXD    BIT   0B1H  ;P3.1 - SERIAL PORT TRANSMIT OUTPUT
INT0   BIT   0B2H  ;P3.2 - EXTERNAL INTERRUPT 0 INPUT
INT1   BIT   0B3H  ;P3.3 - EXTERNAL INTERRUPT 1 INPUT
T0     BIT   0B4H  ;P3.4 - TIMER 0 COUNT INPUT
T1     BIT   0B5H  ;P3.5 - TIMER 1 COUNT INPUT
WR     BIT   0B6H  ;P3.6 - WRITE CONTROL FOR EXT. MEMORY
RD     BIT   0B7H  ;P3.7 - READ CONTROL FOR EXT. MEMORY
PX0    BIT   0B8H  ;IP.0 - EXTERNAL INTERRUPT 0 PRIORITY
PT0    BIT   0B9H  ;IP.1 - TIMER 0 PRIORITY
PX1    BIT   0BAH  ;IP.2 - EXTERNAL INTERRUPT 1 PRIORITY
PT1    BIT   0BBH  ;IP.3 - TIMER 1 PRIORITY
PS     BIT   0BCH  ;IP.4 - SERIAL PORT PRIORITY
P      BIT   0D0H  ;PSW.0 - ACCUMULATOR PARITY FLAG
OV     BIT   0D2H  ;PSW.2 - OVERFLOW FLAG
RS0    BIT   0D3H  ;PSW.3 - REGISTER BANK SELECT 0
RS1    BIT   0D4H  ;PSW.4 - REGISTER BANK SELECT 1
F0     BIT   0D5H  ;PSW.5 - FLAG 0
AC     BIT   0D6H  ;PSW.6 - AUXILIARY CARRY FLAG
CY     BIT   0D7H  ;PSW.7 - CARRY FLAG
As you can see it contains info on typical 8051 registers, ports, and status bits ..
$MOD51 control will allow the ASSEMBLER to recognize these symbols .. otherwise you will have to define them by yourself ..

$PAGING
$NOPAGING
These controls specify whether or not the output listing will be broken into pages or will be output as one continuous listing ..

$LIST
$NOLIST
These controls determine whether or not the source program listing is output or not ..
$LIST will allow the source program listing to be output ..
$NOLIST stops the source program listing from being output ..

MOV 2, #145 will write 145(decimal) to RAM location 02h ..
The same can be don by:
MOV R2, #145d
or
MOV 2, #91h
MOV R2, #91h

Reference:
**broken link removed**

Regards,
IanP
 
Assembly help

thank you very much Ianp
you helped me very much

i voted to you that you "helped me"
 

Re: Assembly help

IanP said:
MOV 2, #145 will write 145(decimal) to RAM location 02h ..
The same can be don by:
MOV R2, #145d
Click to expand...
To be absolutely precise, mov 2,#xxx and mov r2,#xxx are not the same, unless register bank 0 is selected (both RB0 and RB1 bits in PSW are zero); however, this bank is selected after reset, so it is valid as long as one does not touch RB0 and RB1...

wek
 

Re: Assembly help

AA,
mov 2, #145;
means u will move 145 to ram location number 2. This location is register R2 in bank 0. It is different from mov r2, #145. It is up to you to chooses any of them. Your choice will depend on machine cycles & memory bytes each instruction needs.
Regards.
 

Re: Assembly help

I'm learning assembly too. I read Scott MacKenzie's book but I really don't understand about "Assembler directive". Anyone know other document say about this more clearly? Thanks.
 

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