251a.cod

mcs51,2051,x86系列MCU

   ret

main:
   lcall    init_io_ports
;
; User application codes
;
end

##80C251S? IO_P2#
##80C151S? IO_P2#
; Initialize the quasi-bidirectional port pins.  To use these
; pins as inputs they must be written with a one.


; IO port pins:
; Alternate Functions are High Bytes of Address for External Memory

;   p2.0 = $%tP2_DIR.0$IN$OUT$
;   p2.1 = $%tP2_DIR.1$IN$OUT$
;   p2.2 = $%tP2_DIR.2$IN$OUT$
;   p2.3 = $%tP2_DIR.3$IN$OUT$
;   p2.4 = $%tP2_DIR.4$IN$OUT$
;   p2.5 = $%tP2_DIR.5$IN$OUT$
;   p2.6 = $%tP2_DIR.6$IN$OUT$
;   p2.7 = $%tP2_DIR.7$IN$OUT$

$include (251SB.INC)

CSEG  AT FF:0000H                ; Use FF:4000H when compiling for 80CX51SB target board
   ljmp  main

CSEG  AT FF:0100H                ; Use FF:4100H when compiling for 80CX51SB target board
init_io_ports:
   mov   P2, #0$$P2$h      ; Init Port 2
   ret

main:
  lcall init_io_ports
;
; User application codes
;
end

##80C251S? IO_P3#
##80C151S? IO_P3#


; Initialize the quasi-bidirectional port pins.  To use these
; pins as inputs they must be written with a one.


; IO port pins:
;   p3.0 = $%tP3_DIR.0$IN$OUT$         ;Special Function RXD
;   p3.1 = $%tP3_DIR.1$IN$OUT$         ;Special Function TXD
;   p3.2 = $%tP3_DIR.2$IN$OUT$         ;Special Function INT0
;   p3.3 = $%tP3_DIR.3$IN$OUT$         ;Special Function INT
;   p3.4 = $%tP3_DIR.4$IN$OUT$         ;Special Function T0
;   p3.5 = $%tP3_DIR.5$IN$OUT$         ;Special Function T1
;   p3.6 = $%tP3_DIR.6$IN$OUT$         ;Special Function WR
;   p3.7 = $%tP3_DIR.7$IN$OUT$         ;Special Function RD

$include (251SB.INC)

CSEG  AT FF:0000H                ; Use FF:4000H when compiling for 80CX51SB target board
   ljmp  main

CSEG  AT FF:0100H                ; Use FF:4100H when compiling for 80CX51SB target board
init_io_ports:
   mov      P3, #0$$P3$h      ; Init Port 3
   ret

main:
   lcall    init_io_ports
;
; User application codes
;
end

##80C251S? PM#
##80C151S? PM#
; Power Management

;    - Idle Mode    = $%ePCON.0$
;    - Power Down Mode   = $%ePCON.1$

;Power down mode takes precedence over Idle Mode if both
; bits are set.

$include (251SB.INC)

CSEG  AT FF:0000H                ; Use FF:4000H when compiling for 80CX51SB target board
   ljmp  main

CSEG  AT FF:0100H                ; Use FF:4100H when compiling for 80CX51SB target board
init_pm:
$$if$ PCON.1
   setb PD
$$end$
$$if$ PCON.0 &! PCON.1
   setb IDL
$$end$
   ret


main:
   lcall init_pm
;
; User application codes
;
end


##80C251S? Serial#
##80C151S? Serial#
;Serial Port

;Mode       = $%4SCON.6-7$0  /shift register$1  /8-bit UART$2  /9-bit UART$3  /9-bit UART$
;Serial Port Interrupt  = $%eIE0.4$
$$if$  SCON.7
;9th Data Bit     = $%eSCON.3$
$$end$
;Receive    = $%eSCON.4$
;Auto Addressing  = $%eSCON.5$

$include (251SB.INC)

CSEG  AT FF:0000H                ; Use FF:4000H when compiling for 80CX51SB target board
   ljmp  main

CSEG  AT FF:0100H                ; Use FF:4100H when compiling for 80CX51SB target board

init_serial:
   mov   SCON, #0$$SCON$h
$$if$ SCON.6
   $$if$ T2CON.4
;Timer 2 is being used to generate baud rates.
   mov   RCAP2L, #0$$RCAP2L$h ; 16-bit reload value for baud rate generation
   mov   RCAP2H, #0$$RCAP2H$h ;
   mov   T2CON, #0$$T2CON$h   ; Set TIMER 2 into baud rate generator
   $$end$
   $$ifn$ T2CON.4
;Timer 1 is being used to generate baud rates.
      $$if$ PCON.7
   orl   PCON, #80H  ; Double the baud rate
      $$end$
   mov   TMOD, #0$$TMOD$h  ; Set TIMER 1
   mov   TH1, #0$$TH1$h ; Reload value for baud rate
   setb  TR1      ; Start TIMER 1
   $$end$
   $$if$ T2CON.4 &! T2CON.5
;Timer 1 is being used to generate baud rates.
      $$if$ PCON.7
   orl   PCON, #80H  ; Double the baud rate
      $$end$
   mov   TMOD, #0$$TMOD$h; Set TIMER 1
   mov   TH1, #0$$TH1$h ; Reload value for baud rate
   setb  TR1   ; Start TIMER 1
   $$end$
   $$ifn$ T2CON.4 && T2CON.5
;Timer 2 is being used to generate baud rates.
   mov   RCAP2L, #0$$RCAP2L$h ; 16-bit reload value for baud rate generation
   mov   RCAP2H, #0$$RCAP2H$h ;
   mov   T2CON, #0$$T2CON$h   ; Set TIMER 2 into baud rate generator
   $$end$
$$end$
$$ifn$ SCON.6 && SCON.7
   $$if$ PCON.7
   orl   PCON, #80H
   $$end$
$$end$
$$if$ IE0.4
   setb  ES    ; Enable Serial Port interrupt
$$end$
$$if$ SCON.4
   clr   RI    ; Clear Receive interrupt
$$end$
$$ifn$ SCON.4
   mov   SBUF, #00H     ; Clear Serial Port
   clr   TI       ; Clear Transmit interrupt
$$end$
   ret

main:
   lcall    init_serial
;
; User application codes
;
end

##80C251S? TIMER0#
##80C151S? TIMER0#
; Configure Timer $$TIMERX$
;    - Mode                   = $%4TMOD.0-1$0$1$2$3$
;    - Interrupt              = $%tIE0.1$ENABLED$DISABLED$
;    - Clock Source           = $%tTMOD.2$EXTERNAL$INTERNAL$
;    - Enable Gating Control  = $%tTMOD.3$ENABLED$DISABLED$

$include (251SB.INC)

CSEG  AT FF:0000H                ; Use FF:4000H when compiling for 80CX51SB target board
   ljmp  main

CSEG  AT FF:0100H                ; Use FF:4100H when compiling for 80CX51SB target board
init_timer$$TIMERX$:
   anl   TMOD, #0F0H ;clear Timer 0
   orl   TMOD, #0$$TMOD$H  ;
   mov   TL0,  #0$$TL0$H   ;value set by user
   mov   TH0,  #0$$TH0$H   ;value set by user
$$if$ IE0.1
   setb  IE0.1
$$end$
   setb  TR$$TIMERX$    ;TCON.4 start timer
   ret
main:
   lcall init_timer$$TIMERX$
;
; User application codes
;
end


##80C251S? TIMER1#
##80C151S? TIMER1#
; Configure Timer $$TIMERX$
;    - Mode                   = $%4TMOD.4-5$0$1$2$3$
;    - Interuppt              = $%tIE0.3$ENABLED$DISABLED$
;    - Clock Source           = $%tTMOD.6$EXTERNAL$INTERNAL$
;    - Enable Gating Control  = $%tTMOD.7$ENABLED$DISABLED$

$include (251SB.INC)

CSEG  AT FF:0000H                ; Use FF:4000H when compiling for 80CX51SB target board
   ljmp  main

CSEG  AT FF:0100H                ; Use FF:4100H when compiling for 80CX51SB target board
init_timer$$TIMERX$:
   anl   TMOD, #0FH  ;clear Timer 1 control
   orl   TMOD, #0$$TMOD$H  ;
   mov   TL1,  #0$$TL1$H   ;value set by user
   mov   TH1,  #0$$TH1$H   ;value set by user
$$if$ IE0.3
   setb  IE0.3
$$end$
   setb  TR$$TIMERX$    ;TCON.6  start timer 1
   ret

main:
   lcall init_timer$$TIMERX$
;
; User application codes
;
end


##80C251S? TIMER2#
##80C151S? TIMER2#

;The Timer is set to $%5T2MODES$No Operation$Auto Reload$Capture$BaudRate Generator$Clock Out$
$$if$ (T2MODES == 1) || (T2MODES == 2)
;Clock Source       = $%tT2CON.1$EXTERNAL$INTERNAL$
$$if$ (T2MODES == 1)
;Count Direction    = $%tT2MOD.0$UP/DOWN depending on T2EX pin$UP$
$$end$
;Reload Value by $%tT2CON.3$External Transition$Overflow$
$$end$

$include (251SB.INC)

CSEG  AT FF:0000H                ; Use FF:4000H when compiling for 80CX51SB target board
   ljmp  main

CSEG  AT FF:0100H                ; Use FF:4100H when compiling for 80CX51SB target board
 init_timer$$TIMERX$:
   mov   T2CON, #0$$T2CON$h
   mov   T2MOD, #0$$T2MOD$h
$$if$ (T2MODES == 1) || (T2MODES == 2)
   mov   TL2   , #00H      ;set by user
   mov   TH2   , #00H      ;set by user
   mov   RCAP2L, #00H      ;reload value low
   mov   RCAP2H, #00H      ;reload value high
$$if$ T2CON.3
;   Will allow capture or reload on negative transition on T2EX pin
   setb  EXEN2
$$end$
$$end$
$$if$ (T2MODES == 4)
   mov   RCAP2L, #0$$RCAP2L$h ;Clk Out Value
   mov   RCAP2H, #0$$RCAP2H$h ;Clk Out Value
$$end
   setb  TR2      ;T2CON.2 start timer
   ret

main:
   lcall init_timer$$TIMERX$
;
; User application codes
;
end

##80C251S? WDT#
##80C151S? WDT#

$include (251SB.INC)

CSEG  AT FF:0000H                ; Use FF:4000H when compiling for 80CX51SB target board
   ljmp  main

org   FF:000BH                   ; Use FF:400BH when compiling for Intel sb target board
; Using TIMER 0 interrupt routine to service the hardware watchdog timer.
; Reset hardware watchdog timer
   mov   WDTRST, #1EH   ; 1st byte sequence to WDTRST
   mov   WDTRST, #0E1H  ; 2nd byte sequence to WDTRST
; Load new value to TIMER 0 registers
   mov   TL0, #0FFH  ; TIMER 0 to count for 3000H cycles
   mov   TH0, #0CFH  ; for interrupt to occur
   reti

CSEG  AT FF:0100H                ; Use FF:4100H when compiling for 80CX51SB target board
; Set TIMER 0 to service the hardware watchdog timer
init_TIMER0:
   anl   TMOD, #0F1H ; Set TIMER 0 to a 16-bit timer
   mov   TL0, #0FFH  ; TIMER 0 to count for 3000H cycles
   mov   TH0, #0CFH  ; for interrupt to occur
   setb  TR0      ; Start TIMER 0
   ret

; Enable the hardware watchdog timer
init_WDT:
   mov   WDTRST, #1EH   ; 1st byte sequence to WDTRST
   mov   WDTRST, #0E1H  ; 2nd byte sequence to WDTRST
   ret

main:
   lcall init_TIMER0
   lcall init_WDT
;
; User application codes
;
end

##80C151S? CPU#
##80C151S? CODE#

cseg at FFF8H

; This full address will be placed on the address
; bus when Configuration bytes are retrieved from
; external memory (if it is present) during reset.
; Generally, you would place the Configuration bytes
; at offset F8 and F9 within the ending page of your
; physical memory/ROM.  ie. if you have 32K eprom,
; the address used above should be set to 7FF8H
; so that the configuration bytes are placed at the
; proper position in your external memory/ROM.

; NOTE: Positioning of Configuration bytes in memory
; space ONLY applies to devices utilizing external memory.
; Devices with internal ROM (OTP's) are programmed with
; Configuration bytes as outlined in the device manual.

; Take care when utilizing full memory decoding without
; utilizing page FFH in memory/ROM space.  Configuration
; bytes 0 and 1 are fetched by placing the fixed
; addresses  FFF8H and FFF9H on the address bus.

UConfig0:     dcb  #0$$CONFIG0$h
UConfig1:     dcb  #0$$CONFIG1$h



##80C251S? CPU#
##80C251S? CODE#
$include (251SB.INC)

cseg at FF:FFF8H

; This full address will be placed on the address
; bus when Configuration bytes are retrieved from
; external memory (if it is present) during reset.
; Generally, you would place the Configuration bytes
; at offset F8 and F9 within the ending page of your
; physical memory/ROM.  ie. if you have 32K eprom,
; the address used above should be set to FF:7FF8H
; so that the configuration bytes are placed at the
; proper position in your external memory/ROM.

; NOTE: Positioning of Configuration bytes in memory
; space ONLY applies to devices utilizing external memory.
; Devices with internal ROM (OTP's) are programmed with
; Configuration bytes as outlined in the device manual.

; Take care when utilizing full memory decoding without
; utilizing page FFH in memory/ROM space.  Configuration
; bytes 0 and 1 are fetched by placing the fixed
; addresses  FF:FFF8H and FF:FFF9H on the address bus.

UConfig0:     dcb  #0$$CONFIG0$h
UConfig1:     dcb  #0$$CONFIG1$h

init_cpu:
   mov   WCON, #0$$WCON$H
   ret

main:
   lcall init_cpu