start.asm

富士通单片机MB90F387上实现MODBUS

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

;====================================================================
; 4.6  Low-Level Library Interface
;====================================================================

#set          CLIBINIT  OFF        ; <<< select extended libray usage

; This option has only to be set, if stream-IO/standard-IO function of
; the C-libraray have to be used (printf(), fopen()...). This also 
; requires low-level functions to be defined by the application 
; software.
; For other library functions like (e.g. sprintf()) all this is not
; necessary. However, several functions consume a large amount of stack.

;====================================================================
; 4.7  Clock Selection
;====================================================================

#set      NOCLOCK        0         ; do not touch CKSCR register
#set      MAINCLOCK      1         ; select main clock (1/2 external)
#set      PLLx1          2         ; set PLL to x1 ext. clock/quartz
#set      PLLx2          3         ; set PLL to x2 ext. clock/quartz
#set      PLLx3          4         ; set PLL to x3 ext. clock/quartz
#set      PLLx4          5         ; set PLL to x4 ext. clock/quartz

#  if DEBUG == 1
      #set      CLOCKSPEED    NOCLOCK    ; <<< set PLL ratio
#  else
      #set      CLOCKSPEED    PLLx4    ; <<< set PLL ratio
#  endif

#set      CLOCKWAIT      ON        ; <<< wait for stabilized PLL, if
                                   ;     PLL is used
; The clock is set quiet early. However, if CLOCKWAIT is ON, polling 
; for machine clock to be switched to PLL is done at the end of this
; file. Therefore, the stabilization time is not wasted. Main() will
; finally start at correct speed. Resources can immediately be used.
;
; This startup file version does not support subclock.

;====================================================================
; 4.8  External Bus Interface
;====================================================================

#set      SINGLE_CHIP    0         ; all internal
#set      INTROM_EXTBUS  1         ; mask ROM, FLASH, or OTP ROM used

#set      BUSMODE SINGLE_CHIP      ; <<< set bus mode (see mode pins)

#set      ROMMIRROR      ON        ; <<< ROM mirror function ON/OFF
                                   ;     MB90500/400 family only

; In Internal ROM / External Bus mode one can select whether to mirror
; area FF4000..FFFFFF to 004000..00FFFF. This is necessary to get the 
; compiler ROMCONST option working. However, if ROMCONST is not used,
; this area might be used to access external memory. This is intended
; to increase performance, if a lot of dynamic data have to be accessed.
; In SMALL and MEDIUM model these data can be accessed within bank 0,
; which allows to use near addressing.
; These controller without the ROMM-control register always have the
; mirror function on in INROM mode.

; If BUSMODE is "SINGLE_CHIP", ignore remaining bus settings.

#set      AUTOWAIT_IO    0         ; <<< 0..3 waitstates for IO area
#set      AUTOWAIT_LO    0         ; <<< 0..3 for lower external area
#set      AUTOWAIT_HI    0         ; <<< 0..3 for higher external area

#set      ADDR_PINS B'00000000     ; <<< select used address lines 
                                   ;     A23..A16 to be output.
; This is the value to be set in HACR-register. "1" means: pin used as
; IO-port. (B'10000000 => A23 not used, B'00000001 => A16 not used)

#set      BUS_SIGNAL B'00000100    ; <<< enable bus control signals 
;                      |||||||+-- ignored
;                      ||||||+--- bus width lower memory (0:16, 1:8Bit)
;                      |||||+---- output WR signal(s)    (1: enabled  )
;                      ||||+----- bus width upper memory (0:16, 1:8Bit)
;                      |||+------ bus width ext IO area  (0:16, 1:8Bit)
;                      ||+------- enable HRQ input       (1: enabled  )
;                      |+-------- enable RDY input       (1: enabled  )
;                      +--------- output CLK signal      (1:enabled   )

; These settings correspond to the EPCR-register.
; Hint: Except for MB90500/400 devices the clock output is needed for 
; external RDY synchronisation, if Ready function is used.
; Hint: Don't forget to enable WR signals, if external RAM has to be
; written to.

#set      iARSR     ((AUTOWAIT_IO<<6)|((AUTOWAIT_HI&3)<<4)|(AUTOWAIT_LO&3))



;====================================================================
; 4.10  Enable RAMCODE Copying
;====================================================================

#set      COPY_RAMCODE      OFF      ; <<< enable RAMCODE section to
                                    ; be copied from ROM to RAM

; to get this option properly working the code to be executed has to
; be linked to section RAMCODE (e.g. by #pragma section). The section
; RAMCODE has be located in RAM and the section @RAMCODE has to be
; located at a fixed address in ROM by linker settings.

; <<< END OF SETTINGS >>>

;====================================================================
; 5  Section and Data Declaration
;====================================================================

;====================================================================
; 5.1  Several fixed addresses (fixed for MB90xxx controllers)
;====================================================================

LPMCR     .EQU      0xA0           ; Low power mode control register
CKSCR     .EQU      0xA1           ; Clock select control register
#if BUSMODE != SINGLE_CHIP
ARSR      .EQU      0xA5           ; *1) Automatic ready function reg
HACR      .EQU      0xA6           ; *1) External address output reg
EPCR      .EQU      0xA7           ; *1) Bus control signal selection
#endif
#if FAMILY == MB90500 || FAMILY == MB90400
ROMM      .EQU      0x6F           ; *2) ROM mirror control register
#endif
WDTC      .EQU      0xA8           ; Watchdog control register
TBTC      .EQU      0xA9           ; Timerbase timer control register

; *1 only for devices with external bus
; *2 only for MB905xx (FFMC-16LX) devices

;====================================================================
; 5.2  Declaration of __near addressed data sections
;====================================================================

; sections to be cleared
          .SECTION  DATA,      DATA,   ALIGN=2  ; zero clear area
          .SECTION  DIRDATA,   DIR,    ALIGN=2  ; zero clear direct
          .SECTION  LIBDATA,   DATA,   ALIGN=2  ; zero clear lib area

; sections to be initialised with start-up values
          .SECTION  INIT,      DATA,   ALIGN=2  ; initialised area
          .SECTION  DIRINIT,   DIR,    ALIGN=2  ; initialised dir
          .SECTION  LIBINIT,   DATA,   ALIGN=2  ; initialised lib area
#if CONSTDATA == RAMCONST
          .SECTION  CINIT,     DATA,   ALIGN=2  ; initialised const
#endif

; sections containing start-up values for initialised sections above
          .SECTION  DCONST,    CONST,  ALIGN=2  ; DINIT initialisers
          .SECTION  DIRCONST, DIRCONST,ALIGN=2  ; DIRINIT initialisers
          .SECTION  LIBDCONST, CONST,  ALIGN=2  ; LIBDCONST init val

          ; following setion is either copied to CINIT (RAMCONST) or
          ; mapped by ROM-mirror function (ROMCONST)
          .SECTION  CONST,     CONST,  ALIGN=2  ; CINIT initialisers

;====================================================================
; 5.3  Declaration of RAMCODE section and labels
;====================================================================

#if COPY_RAMCODE == ON
          .SECTION  RAMCODE,   CODE,  ALIGN=1  
          .IMPORT _RAM_RAMCODE                  ; provided by linker
          .IMPORT _ROM_RAMCODE                  ; provided by linker
#endif


;====================================================================
; 5.4  Declaration of sections containing other sections description
;====================================================================

; DCLEAR contains start address and size of all sections to be cleared
; DTRANS contains source and destination address and size of all 
; sections to be initialised with start-up values
; The compiler automatically adds a descriptor for each __far addressed
; data section to DCLEAR or DTRANS. These __far section are separated 
; for each C-module.

; In addition the start-up file adds the descriptors of the previously
; declared __near section here. This way the same code in the start-up
; file can be used for initialising all sections.

   .SECTION  DCLEAR,    CONST,  ALIGN=2  ; zero clear table
   ;    Address         Bank            Size
   .DATA.H DATA,    BNKSEC DATA,    SIZEOF(DATA   )
   .DATA.H DIRDATA, BNKSEC DIRDATA, SIZEOF(DIRDATA)
   .DATA.H LIBDATA, BNKSEC LIBDATA, SIZEOF(LIBDATA)

   .SECTION  DTRANS,    CONST,  ALIGN=2  ; copy table
   ;    Address         Bank          Address     Bank          Size
   .DATA.H DCONST,   BNKSEC DCONST,   INIT,   BNKSEC INIT,   SIZEOF INIT   
   .DATA.H DIRCONST, BNKSEC DIRCONST, DIRINIT,BNKSEC DIRINIT,SIZEOF DIRINIT
   .DATA.H LIBDCONST,BNKSEC LIBDCONST,LIBINIT,BNKSEC LIBINIT,SIZEOF LIBINIT

#if CONSTDATA == RAMCONST
   .DATA.H CONST,    BNKSEC CONST,    CINIT,  BNKSEC CINIT,  SIZEOF CINIT  
#endif

#if COPY_RAMCODE == ON
   .DATA.L _ROM_RAMCODE, _RAM_RAMCODE
   .DATA.H SIZEOF RAMCODE
#endif

;====================================================================
; 5.5  Stack area and stack top definition
;====================================================================

          .EXPORT   SSTACK_BASE, SSTACK_TOP
          
               .SECTION  SSTACK, STACK, ALIGN=2
SSTACK_BASE:
          .RES.H    SSSIZE
SSTACK_TOP:
               .SECTION  USTACK, STACK, ALIGN=2
          .RES.H    USSIZE
USTACK_TOP:

;====================================================================
; 5.6  Direct page register dummy label definition
;====================================================================

          .SECTION  DIRDATA  ; zero clear direct
DIRDATA_S:                                      ; label for DPR init       

; This label is used to get the page of the __direct data.
; Depending on the linkage order  order this startup file the label is
; placed anywhere within the __direct data page. However, the
; statement "PAGE (DIRDATA_S)" is processed. Therefore, the lower 
; 8 Bit of the address of DIRDATA_S are not relevant and this feature 
; becomes linkage order independent. 
; Note, the linker settings have to make sure that the all __direct
; data are located within the same physical page (256 Byte block).

;====================================================================
; 6  Start-Up Code
;====================================================================

;====================================================================
; 6.1  Import external symbols
;====================================================================

          .IMPORT   _main                    ; user code entrance
#if CLIBINIT == ON
          .IMPORT   __stream_init
          .IMPORT   _exit
          .EXPORT   __exit
#endif          

;====================================================================
;   ___  _____   __    ___  _____
;  /       |    /  \  |   \   |