start.asm

OCU Project for MB90460 Series

;====================================================================
;    MB90500/MB90600/MB90700/MB90700H/MB90200 Series C Compiler,
;    (C) FUJITSU MICROELECTRONICS EUROPE 1998-99
;
;    Startup file for memory and basic controller initialisation 
;====================================================================

          .PROGRAM  STARTUP  
          .TITLE    "STARTUP FILE FOR MEMORY INITIALISATION"

;====================================================================
; 1  Contents
;====================================================================
; 1   Contents
; 2   Disclaimer
; 3   History
;
; 4   SETTINGS              (USER INTERFACE)
; 4.1   Controller Family
; 4.2   Memory model
; 4.3   Constant Data Handling
; 4.4   Stack Type and Stack Size
; 4.5   General Register Bank
; 4.6   Low-Level Library Interface
; 4.7   Clock Selection
; 4.8   External Bus Interface
; 4.9   Reset Vector
; 4.10  Enable RAMCODE Copying
;
; 5   Section and Data Declaration
; 5.1   Several fixed addresses (fixed for MB90xxx controllers)
; 5.2   Declaration of __near addressed data sections
; 5.3   Declaration of RAMCODE section and labels
; 5.4   Declaration of sections containing other sections description
; 5.5   Stack area and stack top definition
; 5.6   Direct page register dummy label definition
;
; 6   Start-Up Code
; 6.1   Import external symbols
; 6.2   "NOT RESET YET" WARNING
; 6.3   Program start (the reset vector should point here)
; 6.4   Set clock ratio 
; 6.5   Set external bus configuaration
; 6.6   Copy initial values to data areas.
; 6.7   Clear uninitialised data areas to zero
; 6.8   Prepare stacks and set the default stack type
; 6.9   Set Data Bank Register (DTB) and Direct Page Register (DPR)
; 6.10  Wait for PLL to stabilise
; 6.11  Initialise Low-Level Library Interface
; 6.12  Call C-language main function
; 6.13  Shut down library
; 6.14  Program end loop
; 6.15  Debug address specification
;
;====================================================================
; 2  Disclaimer
;====================================================================
;                  FUJITSU MIKROELEKTRONIK GMBH                 
;                  Am Siebenstein 6-10, 63303 Dreieich          
;                  Tel.:++49/6103/690-0,Fax - 122               
;                                                               
;    The following software is for demonstration purposes only. 
;    It is not fully tested, nor validated in order to fullfill 
;    its task under all circumstances. Therefore, this software 
;    or any part of it must only be used in an evaluation       
;    laboratory environment.                                    
;    This software is subject to the rules of our standard      
;    DISCLAIMER, that is delivered with our SW-tools on the CD 
;    "Micros Documentation & Software" (V3.0 see "\START.HTM") or 
;    see our Internet Page -                                      
;    http://www.fujitsu-ede.com/products/micro/disclaimer.html    
;																  
;====================================================================
; 3  History
;====================================================================
;                               
; Version 1.00      25 Aug 98   Holger Loesche
;   - original version
; Version 1.01      31 Aug 98   Holger Loesche
;   - bug: conditional for reset vector was missing
; Version 1.02      16 Oct 98   Holger Loesche
;   - memory model AUTO introduced (use far calls only and repair
;     stack, if necessary
;   - colons removed from EQU labels
;   - stream_init call added
;   - RAMCONST set as default (also for ROMCONST systems)
; Version 1.03      19 Oct 98   Holger Loesche
;   - bug: SEGCOPY macro: used size changed from sizeof(src) to 
;     sizeof(dest). It was conflicting with RAMCONST, if compiler
;     is set to ROMCONST.
; Version 1.04      21 Oct 98   Holger Loesche
;   - ROM mirror option added
;   - _exit call added
;   - bug: EQU ON/OFF move to upper lines 
; Version 1.05      28 Oct 98   Holger Loesche
;   - CALL/CALLP _exit was not differed
; Version 1.06      18 Feb 99   Holger Loesche
;   - default external bus configuration: WR signal enabled
;   - ROMMIRROR macro processing simplified (less warnings>
; Version 1.07      01 April 99   Holger Loesche
;   - Version string had wrong number (1.05 instead of 1.06)
;   - Copyright slightly changed
; Version 1.08      16 April 99   Juergen Rohn
;   - Version placed in separate section (caused problems with fixed
;     reset vector)
; Version 1.09      12 May 99     Holger Loesche
;   - MB90400 family added
;   - several coments changed
;   - INTROM_EXTBUS macro was wrong
;   - BUSWIDTH macro removed, now resolved from bus signal
;   - disclaimer added
;   - disabling interrupts added
; Version 1.10      17 May 99     Holger Loesche
;   - change in 1.09 (MODEBYTE) related to BUSWIDTH was not complete
; Version 1.11      1 June 99     Holger Loesche
;   - confusing old line with comment removed, was refering to unused
;     old BUSWIDTH
; Version 1.12      23 June 99    Holger Loesche
;   - CLIBINIT is using ON/OFF instead of extra macro now
; Version 2.00      23 July 99    Holger Loesche
;   - decriptors of __near sections now in DCLEAR/DTRANS
;   - code for __near section init removed, now initialised by DCLEAR
;     and DTRANS processing
;   - RAMCODE option added
;   - table of contents added
;   - memory model AUTO renamed to AUTOMODEL
;   - CONSTDATA mode AUTOCONST introduced to make it clearer
; Version 2.01      11 Oct 99    Holger Loesche
;   - unused macros WIDTH_8 and WIDTH_16 removed
;
;====================================================================
          .SECTION  VERSIONS, CONST
          .SDATA    "Start 2.01\n"      ; comment this line to remove

;====================================================================
; 4  Settings
;====================================================================
;
; CHECK ALL OPTIONS WHETHER THEY FIT TO THE APPLICATION;
;
; Configure this startup file in the "Settings" section. Search for
; comments with leading "; <<<". This points to the items to be set.
;====================================================================
#set      OFF       0
#set      ON        1

;====================================================================
; 4.1  Controller Family
;====================================================================

#set      MB90700   0
#set      MB90200   1
#set      MB90600   2
#set      MB90500   3
#set      MB90400   4

#set      FAMILY    MB90400        ; <<< select family

; NOTE: This startup file is not suitable for MB90610 series. Use
; start610.asm instead.
;====================================================================
; 4.2  Memory model
;====================================================================

                                   ;      data      code   
#set      SMALL     0              ;     16 Bit    16 Bit
#set      MEDIUM    1              ;     16 Bit    24 Bit
#set      COMPACT   2              ;     24 Bit    16 Bit
#set      LARGE     3              ;     24 Bit    24 Bit
#set      AUTOMODEL 4              ; works always, might waste 2 bytes


#set      MEMMODEL  AUTOMODEL      ; <<< C-memory model

; The selected memory model should be set in order to fit to the
; model selected for the compiler. 
; Note, in this startup version AUTOMODEL will work for all
; C-models. However, if the compiler is configured for SMALL or
; COMPACT, two bytes on stack will be lost. If this is not
; acceptable, the above setting should be set to the correct model.

;====================================================================
; 4.3  Constant Data Handling
;====================================================================

#set      ROMCONST    0            ; works only with compiler ROMCONST
#set      RAMCONST    1            ; works with BOTH compiler settings
#set      AUTOCONST   RAMCONST     ; works with BOTH compiler settings
                              
#set      CONSTDATA   AUTOCONST    ; <<< set RAM/ROM/AUTOCONST

; - AUTOCONST (default) is a the same as RAMCONST
; - RAMCONST/AUTOCONST should always work, even if compiler is set to
;   ROMCONST. If compiler is set to ROMCONST and this startup file is
;   set to RAMCONST or AUTOCONST, this startup file will only generate
;   an empty section CINIT. The code, which copies from CONST to CINIT 
;   will not have any effect then.
; - It is highly recommended to set the compiler to ROMCONST for 
;   single-chip mode or internal ROM+ext bus. The start-up file 
;   should be set to AUTOCONST.
; - ROMCONST setting on systems with full external bus requires exter-
;   nal address mapping.
;   Single-chip can be emulated by the emulator debugger.
;   ROM mirror can also be used with simulator.
;
; see also MIRROR options of external bus settings

;====================================================================
; 4.4  Stack Type and Stack Size
;====================================================================

#set      USRSTACK  0    ; use user stack, system stack for interrupts
#set      SYSSTACK  1    ; use system stack for all (program + inter)

#set      STACKUSE  SYSSTACK       ; <<< set used stacks

; - If only system stack is used and SSB is linked to a different bank
;   than USB, make sure that all C-modules (which generate far pointers 
;   to stack data) have "#pragma SSB". Applies only to exclusive confi-
;   gurations.
; - Note, several library functions require quite a big stack (due to 
;   ANSI). Check the stack information files (*.stk) in the LIB\907
;   directory.

SSSIZE         .EQU 384            ; <<< system stack size in words
#if STACKUSE == USRSTACK
USSIZE         .EQU 384            ; <<< user stack size, if used
#else
USSIZE         .EQU 1              ; just a dummy
#endif


#if STACKUSE == USRSTACK
#  macro RELOAD_SP                 ; used after function call
          MOVW A, #USTACK_TOP      ; repair stack, if stream_init
          MOVW SP,A                ; was completed by RET (not RETP)
#  endm
#else
#  macro RELOAD_SP                 ; used after function call
          MOVW A, #SSTACK_TOP      ; repair stack, in case stream_init
          MOVW SP,A                ; was completed by RET (not RETP)
#  endm
#endif

;====================================================================
; 4.5  General Register Bank
;====================================================================

#set      REGBANK   0              ; <<< set default register bank

; set the General Register Bank that is to be used after startup.
; Usually, this is bank 0, which applies to address H'180..H'18F. Set
; in the range from 0 to 31.
; Note: All used register banks have to be reserved (linker options).

#if REGBANK > 31 || REGBANK < 0
#  error REGBANK setting out of range
#endif

;====================================================================