start.asm

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#set      COMPACT   2              ;     24 Bit    16 Bit
#set      LARGE     3              ;     24 Bit    24 Bit
#set      AUTOMODEL 4              ; works always, might occupy two
                                   ; additional 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 additional bytes on stack are occupied. If this is not
; acceptable, the above setting should be set to the correct model.

;====================================================================
; 4.3  Function-Call Interface
;====================================================================
          #if __REG_PASS__
            .REG_PASS
          #endif

; Above statement informs Assembler on compatibility of start-up code
; to  Function Call Interface  as selected for the application. There
; is nothing to configure.
; The Function-Call Interface specifies the method of passing parame-
; ter from function caller to callee.  The standard method of FCC907S
; compiler  uses  "stack argument passing".  Alternatively,  language
; tools can be configured for "register argument passing".
; For details see the compiler manual.
; This start-up file is compatible to both interfaces.
;====================================================================
; 4.4  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 generate an
;   empty section CINIT in RAM. However, the code, which copies from
;   CONST to CINIT will not have any effect, because size of section 0.
; - 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

;====================================================================
; 4.5  Stack Type and Stack Size
;====================================================================

#set      USRSTACK      0    ; user stack: for main program
#set      SYSSTACK      1    ; system stack: for main program and interrupts

#set      STACKUSE  SYSSTACK    ; <<< set active stack

#set      STACK_RESERVE ON      ; <<< reserve stack area in this module
#set      STACK_SYS_SIZE 768    ; <<< byte size of System stack
#set      STACK_USR_SIZE 2      ; <<< byte size of User stack

#set      STACK_FILL    ON      ; <<< fills the stack area with pattern
#set      STACK_PATTERN 0x55AA  ; <<< the pattern to write to stack

; - If the active stack is set to SYSSTACK, it is used for main program
;   and interrupts. In this case, the user stack could be set to a dummy
;   size.
;   If the active stack is set to user stack, it is used for the main
;   program but the system stack s automatically activated, if an inter-
;   rupt is serviced. Both stack areas must have a reasonable size.
; - If STACK_RESERVE is ON, the sections USTACK and SSTACK are reserved
;   in this module. Otherwise, they have to be reserved in other modules.
;   If STACK_RESERVE is OFF, the size definitions STACK_SYS_SIZE and
;   STACK_USR_SIZE have no meaning.
; - Even if they are reverved in other modules, they are still initialised
;   in this start-up file.
; - Filling the stack with pattern allows to dynamically check the stack
;   area, which had already been used.
;
; - 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.

;====================================================================
; 4.6  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

;====================================================================
; 4.7  Low-Level Library Interface
;====================================================================

#set          CLIBINIT  OFF        ; <<< select extended library 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.

;====================================================================
; 4.8  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

; next factors are for specific MCU only
; Check datasheet or header file for presence of register PSCCR. The
; header file (assembler part) must be member in project, so linker
; can find the extended PLL register.
#set      PLLx6          6         ; set PLL to x6 ext. clock/quartz
#set      PLLx8          7         ; set PLL to x8 ext. clock/quartz


#set      CLOCKSPEED    PLLx4      ; <<< set PLL ratio
#set      CLOCKWAIT      ON        ; <<< wait for stabilized PLL, if
                                   ;     PLL is used
#set      EXTENDED_PLL   ON       ; <<< set ON, if PSCCR exists

; 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.
; Note, for controllers with extended PLL and sub-clock the sub-clock
; divider is set to 4.

#if EXTENDED_PLL == ON
#  define PSCCR __psccr
          .import PSCCR            ; import definition from IO-file
#else

#  if CLOCKSPEED > PLLx4
#    error: clock > factor 4 requires spec. MCU and EXTENDED__PLL == ON
#  endif

#endif

;====================================================================
; 4.9  External 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      MULTIPLEXED     0        ;
#set      NON_MULTIPLEXED 1        ; only if supported by the device

#set      ADDRESSMODE MULTIPLEXED  ; <<< set address-mode

; Some devices support multiplexed and/or non-multiplexed Bus mode
; please refer to the related datasheet/hardwaremanual

#set      ROMMIRROR      ON        ; <<< ROM mirror function ON/OFF
                                   ;     MB90500/400/300/800 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 MB90500/400/300/800 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 Reset Vector
;====================================================================

#set      RESET_VECTOR   ON        ; <<< enable reset vector

#if BUSMODE == SINGLE_CHIP
#  set    MODEBYTE       0

#else                              ; external bus
#  set MODEBYTE (((BUSMODE&3)<<6) | ((ADDRESSMODE&1)<<4) | ((~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

;====================================================================
; 4.11  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.

;====================================================================
; 4.12  Enable information stamps in ROM
;====================================================================

#set      VERSION_STAMP     OFF     ; <<< enable version number in
                                    ; separated section