code not working

;**************************************************************
;* This stationery serves as the framework for a              *
;* user application. For a more comprehensive program that    *
;* demonstrates the more advanced functionality of this       *
;* processor, please see the demonstration applications       *
;* located in the examples subdirectory of the                *
;* Freescale CodeWarrior for the HC12 Program directory       *
;**************************************************************
; Include derivative-specific definitions
            INCLUDE 'derivative.inc'

; export symbols
            XDEF Entry, _Startup, main
            ; we use export 'Entry' as symbol. This allows us to
            ; reference 'Entry' either in the linker .prm file
            ; or from C/C++ later on

            XREF __SEG_END_SSTACK      ; symbol defined by the linker for the end of the stack




; variable/data section
MY_EXTENDED_RAM: SECTION
; Insert here your data definition.

           ORG $1100
value       ds.b 1
           ORG $1105

; code section
MyCode:     SECTION
main:
_Startup:
Entry:
             
            LDS  #__SEG_END_SSTACK     ; initialize the stack pointer
            CLI                     ; enable interrupts



;***************************************************************************
;*                   Program to turn ONN                                   *
;*                         ALL                                             *
;*                   Turn OFF All the four LEDS                            *
;***************************************************************************



             movb   #$0F,DDRT
             ldaa   #$00
 in:
             staa   value  
             
             movb   value,PTT         
      
 ;wait for 0.75 sec                         
             jsr     delay_By_0.75sec
;increment the value of  counter 
             inca    
             cmpa  #$0F
             bls    in 




L1:          bra  L1

;********************************************************************
;*           Sub routine to generate delay of 0.75 sec 
;*
;********************************************************************
delay_By_0.75sec:

; running 10 time the inner loop we will get 10*75ms =0.75sec delay 
            ldab  #10

out_loop:
;inner loop will generate delay of 75 ms we will have to repeat this process 45000 times to genrate this delay of 75ms  
            ldx   #45000
in_loop:
            
            psha
            pula 
            psha
            pula 
            psha
            pula 
            psha
            pula 
            psha
            pula 
            psha
            pula 
            psha
            pula 
            psha
            pula 
            nop
            nop
            dbne x,in_loop
            dbne b,out_loop
            rts                                     

I am having troulbe getting this code to work on my tower module. I am using the freescale TWR-S12G128 with codewarrior. I have compiled the above program and debugged it with no trouble. the problem is the LED's are not lighting up at all and I don't know why. I am pretty sure the code I have written is correct. Any help would be appreciated. thank you.