main.dbg

Motorola公司单片机MC68HC908实现PWM功能的实例程序,C语言在Code Warrier集成环境中编写。

;**************************************************************
;* This stationery is meant to serve as the framework for a   *
;* user application. For a more comprehensive program that    *
;* demonstrates the more advanced functionality of this       *
;* processor, please see the demonstration applications       *
;* located in the examples subdirectory of the                *
;* Metrowerks Codewarrior for the HC08 Program directory      *
;**************************************************************

; export symbols
            XDEF Entry, main
            ; we use export 'Entry' as symbol. This allows us to
            ; reference 'Entry' either in the linker .prm file
            ; or from C/C++ later on
                       
; include derivative specific macros
            Include 'sr12_registers.inc'
 ; 68HC908SR12 Equates

PTA    EQU $0000     ; Ports and data direction
PORTA  EQU $0000     ; Port A Data register
PTB    EQU $0001
PORTB  EQU $0001     ; Port B data register
PTC    EQU $0002
PORTC  EQU $0002     ; Port C data register
PTD    EQU $0003
PORTD  EQU $0003     ; Port D data register
DDRA   EQU $0004     ; Port A data direction register
DDRB   EQU $0005     ; Port B data direction register
DDRC   EQU $0006     ; Port C data direction register
DDRD   EQU $0007     ; Port D data direction register

LEDA   EQU $000C     ; Port-A LED Control Register
LEDC   EQU $000D     ; Port-C LED Control Register

AMCR   EQU $000E     ; Analog Module Control Register
AMGCR  EQU $000F     ; Analog Module Gain Control Register
AMSCR  EQU $0010     ; Analog Module Status & Control Register

SCC1   EQU $0013     ; SCI Control Register 1
SCC2   EQU $0014     ; SCI Control Register 2
SCC3   EQU $0015     ; SCI Control Register 3
SCS1   EQU $0016     ; SCI Status Register 1
SCS2   EQU $0017     ; SCI Status Register 2
SCDR   EQU $0018     ; SCI Data Register
SCBR   EQU $0019     ; SCI Baud Rate Register

KBSCR  EQU $001A     ; Keyboard Status & Control register
KBIER  EQU $001B     ; Keyboard interrupt enable register

IRQ1     EQU $001E   ; IRQ1 Status & Control Register
INTSCR1  EQU $001E

IRQ2     EQU $001C    ; IRQ2 Status & Control Register
INTSCR2  EQU $001C

CONFIG1  EQU $001F    ; Configuration Register 1
CONFIG2  EQU $001D    ; Configuration Register 2

T1SC     EQU $0020    ; Timer 1 Status & Control Register
T1CNTH   EQU $0021    ; Timer 1 Counter Register High
T1CNTL   EQU $0022    ; Timer 1 Counter Register Low
T1MODH   EQU $0023    ; Timer 1 Counter Modulo Register High
T1MODL   EQU $0024    ; Timer 1 Counter Modulo Register Low
T1SC0    EQU $0025    ; Timer 1 Channel 0 Status & Control Register
T1CH0H   EQU $0026    ; Timer 1 Channel 0 Register High
T1CH0L   EQU $0027    ; Timer 1 Channel 0 Register Low
T1SC1    EQU $0028    ; Timer 1 Channel 1 Status & Control Register
T1CH1H   EQU $0029    ; Timer 1 Channel 1 Register High
T1CH1L   EQU $002A    ; Timer 1 Channel 1 Register Low
T2SC     EQU $002B    ; Timer 2 Status & Control Register
T2CNTH   EQU $002C    ; Timer 2 Counter Register High
T2CNTL   EQU $002D    ; Timer 2 Counter Register Low
T2MODH   EQU $002E    ; Timer 2 Counter Modulo Register High
T2MODL   EQU $002F    ; Timer 2 Counter Modulo Register Low
T2SC0    EQU $0030    ; Timer 2 Channel 0 Status & Control Register
T2CH0H   EQU $0031    ; Timer 2 Channel 0 Register High
T2CH0L   EQU $0032    ; Timer 2 Channel 0 Register Low
T2SC1    EQU $0033    ; Timer 2 Channel 1 Status & Control Register
T2CH1H   EQU $0034    ; Timer 2 Channel 1 Register High
T2CH1L   EQU $0035    ; Timer 2 Channel 1 Register Low

PTCL     EQU $0036    ; PLL Control Register
PBWC     EQU $0037    ; PLL Bandwidth Control Register
PMSH     EQU $0038    ; PLL Multiplier Select Register High
PMSL     EQU $0039    ; PLL Multiplier Select Register Low
PMRS     EQU $003A    ; PLL VCO Range Select
PMDS     EQU $003B    ; PLL Reference Divider Select Register

TBCR     EQU $0046    ; Timebase Control Register

MMADR    EQU $0048    ; MMIIC Address Register
MMCR1    EQU $0049    ; MMIIC Control Register 1
MMCR2    EQU $004A    ; MMIIC Control Register 2
MMSR     EQU $004B    ; MMIIC Status Register
MMDTR    EQU $004C    ; MMIIC Data Transmit Register
MDDRR    EQU $004D    ; MMIIC Data Receive Register
MMCRDR   EQU $004E    ; MMIIC CRC Data Register
MMFDR    EQU $004F    ; MMIIC Frequency Divider Register

PWMCR    EQU $0051    ; PWM Control Register
PWMCCR   EQU $0052    ; PWM Clock Control Register
PWMDR0   EQU $0053    ; PWM Data Register 0
PWMDR1   EQU $0054    ; PWM Data Register 1
PWMDR2   EQU $0055    ; PWM Data Register 2
PWMPCR   EQU $0056    ; PWM Phase Control Register

ADSCR    EQU $0057    ; ADC Status & Control Register
ADICLK   EQU $0058    ; ADC Clock Control Register
ADRH0    EQU $0059    ; ADC Data Register High 0
ADRL0    EQU $005A    ; ADC Data Register Low 0
ADRL1    EQU $005B    ; ADC Data Register Low 1
ADRL2    EQU $005C    ; ADC Data Register Low 2
ADRL3    EQU $005D    ; ADC Data Register Low 3
ADASCR   EQU $005E    ; ADC Auto-scan Control Register

SBSR     EQU $FE00    ; SIM Break Status Register
SRSR     EQU $FE01    ; SIM Reset Status Register
SBFCR    EQU $FE03    ; SIM Break Flag Control Register

INT1     EQU $FE04    ; Interrupt Status Register 1
INT2     EQU $FE05    ; Interrupt Status Register 2
INT3     EQU $FE06    ; Interrupt Status Register 3

FLCR     EQU $FE08    ; FLASH Control Register
FLBPR    EQU $FE09    ; FLASH Block Protect Register

BRKH     EQU $FE0C    ; Break Address Register High
BRKL     EQU $FE0D    ; Break Address Register Low
BRKSCR   EQU $FE0E    ; Break Status & Control Register

LVISR    EQU $FE0F    ; Low-Voltage Inhibit Status Register

MOR      EQU $FF80    ; Mask Option Register

COPCTL   EQU $FFFF    ; COP Control Register


; variable/data section
MY_ZEROPAGE: SECTION  SHORT
; Insert here your data definition. For demonstration, temp_byte is used.
temp_byte ds.b 1
delay  ds.b   1
num  EQU  5
; code section
MyCode:     SECTION
main
            SEI 
            CLRA
            CLRX
            LDA  #$09
            STA  CONFIG1  ;COP禁止， 5V模式
            BCLR 5,PTCL   ;关闭锁相环
            LDA  #$40
            STA  PWMDR2
            STA  PWMDR1
            STA  PWMDR0
            LDA  #$02
            STA  PWMCCR   ;选用CGMOUT作为PWM的输入时钟，预分频系数为4
            LDA  #$1A     ;设置PWM2与PWM1之间的相位差为52个总线时钟周期
            STA  PWMPCR
            BSET 7,PWMPCR ;使能相位差控制。
            MOV  #num, delay
            LDA  #$E7
            STA  PWMCR     ;启动PWM，  ￥￥￥
      LOOP: LDA  delay
            CMP  #0
            DECA
            STA  delay
            BHI  LOOP
            LDA  #$8D      ;设置PWM1与PWM0之间的相位差为26个总线时钟周期
            STA  PWMPCR    
            JMP  *         ;从 ￥￥￥到此总共运行65个时钟周期
            
Entry:
            CLI               ; enable interrupts
            MOV #1,temp_byte  ; just some demonstration code
            BSR main          ; Insert here your own code
            BRA Entry         ; endless loop