start.asm

相关富士通单片机实用资料5

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

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

;====================================================================
; 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.
;
;====================================================================
;    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  
;
;====================================================================
;    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, no resolved from bus signal
;   - disclaimer added
; Version 1.10      17. May 99    Holger Loesche
;   - change in 1.09 (MODEBYTE) related to BUSWIDTH was not complete
; Version 1.11      01.06. May 99    Holger Loesche
;   - confusing old line with comment removed, was refering to unused
;     old BUSWIDTH
; Version 1.12      23.06. May 99    Holger Loesche
;   - LIBINIT is using ON/OFF instead of extra macro now
;
;====================================================================
          .SECTION  VERSIONS, CONST
          .SDATA    "Start 1.12\n"      ; comment this line to remove

;====================================================================
;    Settings
;====================================================================
#set      OFF       0
#set      ON        1

; ------- controller family ---------

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

#set      FAMILY    MB90500        ; <<< select family

; ------- Memory models ---------      default address size    
                                   ;      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      AUTO      4              ; works always, might waste 2 bytes

#set      MEMMODEL  AUTO           ; <<< 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 AUTO 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.

; ------- Constant symbols ---------

#set      ROMCONST  0              ; works only with compiler ROMCONST
#set      RAMCONST  1              ; works with BOTH compiler settings
                              
#set      CONSTDATA RAMCONST       ; <<< set RAMCONST or ROMCONST

; - RAMCONST (default) should always work, even if compiler is set 
;   to ROMCONST.
;   If compiler is set to ROMCONST and this startup file is set to
;   RAMCONST, 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.
; - Full external bus requires external 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

; ------- stack ---------

#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 SSB 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 configurations.
; - 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

; ------- 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.

#if REGBANK > 31 || REGBANK < 0
#  error REGBANK setting out of range
#endif
; ------- Library interface ---------

#set          NOLIBINIT 0          ; do not initialize Library
#set          DOLIBINIT 1          ; initialize Library interface

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

; This option has only to be set, if file-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.

; ------- 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

#set      CLOCKSPEED    PLLx4      ; <<< set PLL ratio
#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.

; ------- Bus interface ---------

#set      SINGLE_CHIP    0         ; all internal
#set      INTROM_EXTBUS  1         ; mask ROM, FLASH, or OTP ROM used
#set      EXTROM_EXTBUS  2         ; full external bus (INROM not used) 

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

;#set       BUSMODE  INTROM_EXTBUS
#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      WIDTH_8        0         ; 8 Bit external bus
#set      WIDTH_16       1         ; 16 Bit external bus

#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))

; ------- Reset Vector ---------

#set      RESET_VECTOR   ON        ; <<< enable reset vector

#if BUSMODE == SINGLE_CHIP
#  set    MODEBYTE       0
#else
#  set    MODEBYTE       ( ((BUSMODE&3)<<6) | ((~BUS_SIGNAL)&8) )
#endif

; Above setting can also be used, if all other interrupt vectors are
; specified via "pragma intvect". Only if interrupts 0..7 are specified
; via "pragma intvect", this will conflict with the vector in this
; module. The reason is the INTVECT section, which includes the whole
; area from the lowest to the highest specified vector.

#if RESET_VECTOR == ON
          .SECTION        RESVECT, CONST, LOCATE=H'FFFFDC
          .DATA.E _start
          .DATA.B MODEBYTE
#endif


; <<< END OF SETTINGS >>>

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