mod751

包括了各种常用的8051单片机的程序

;   REV.  2.0    Apr 11, 1988
P0        DATA  080H  ;PORT 0
SP        DATA  081H  ;STACK POINTER
DPL       DATA  082H  ;DATA POINTER - LOW BYTE
DPH       DATA  083H  ;DATA POINTER - HIGH BYTE
PCON      DATA  087H  ;POWER CONTROL
TCON      DATA  088H  ;TIMER CONTROL
TL        DATA  08AH  ;TIMER 0 - LOW BYTE
RTL       DATA  08BH  ;TIMER 0 - LOW BYTE RELOAD  
TH        DATA  08CH  ;TIMER 0 - HIGH BYTE
RTH       DATA  08DH  ;TIMER 0 - HIGH BYTE RELOAD
P1        DATA  090H  ;PORT 1
I2CON     DATA  098H  ;I2C CONTROL
I2DAT     DATA  099H  ;I2C DATA 
IE        DATA  0A8H  ;INTERRUPT ENABLE
P3        DATA  0B0H  ;PORT 3
PSW       DATA  0D0H  ;PROGRAM STATUS WORD
I2CFG     DATA  0D8H  ;I2C CONFIGURATION
ACC       DATA  0E0H  ;ACCUMULATOR
B         DATA  0F0H  ;MULTIPLICATION REGISTER
I2STA     DATA  0F8H  ;I2C INTERNAL STATUS
SCL       BIT   080H  ;P0.0 - I2C SERIAL CLOCK
SDA       BIT   081H  ;P0.1 - 12C SERIAL DATA
IT1       BIT   088H  ;TCON.0 - EXT. INTERRUPT 1 TYPE
IE1       BIT   089H  ;TCON.1 - EXT. INTERRUPT 1 EDGE FLAG
IT0       BIT   08AH  ;TCON.2 - EXT. INTERRUPT 0 TYPE
IE0       BIT   08BH  ;TCON.3 - EXT. INTERRUPT 0 EDGE FLAG
TR        BIT   08CH  ;TCON.4 - TIMER 0 ON/OFF CONTROL
TF        BIT   08DH  ;TCON.5 - TIMER 0 OVERFLOW FLAG
CT        BIT   08EH  ;TCON.6 - TIMER 1 ON/OFF CONTROL
GATE      BIT   08FH  ;TCON.7 - TIMER 1 OVERFLOW FLAG
INT0      BIT   095H  ;P1.5 - EXTERNAL INTERRUPT 0 INPUT
INT1      BIT   096H  ;P1.6 - EXTERNAL INTERRUPT 1 INPUT
T0        BIT   097H  ;P1.7 - TIMER 0 COUNT INPUT
EX0       BIT   0A8H  ;IE.0 - EXTERNAL INTERRUPT 0 ENABLE
ET0       BIT   0A9H  ;IE.1 - TIMER 0 INTERRUPT ENABLE
EX1       BIT   0AAH  ;IE.2 - EXTERNAL INTERRUPT 1 ENABLE
ETI       BIT   0ABH  ;IE.3 - TIMER 1 INTERRUPT ENABLE
EI2       BIT   0ACH  ;IE.4 - SERIAL PORT INTERRUPT ENABLE
EA        BIT   0AFH  ;IE.7 - GLOBAL INTERRUPT ENABLE
P         BIT   0D0H  ;PSW.0 - ACCUMULATOR PARITY FLAG
OV        BIT   0D2H  ;PSW.2 - OVERFLOW FLAG
RS0       BIT   0D3H  ;PSW.3 - REGISTER BANK SELECT 0
RS1       BIT   0D4H  ;PSW.4 - REGISTER BANK SELECT 1
F0        BIT   0D5H  ;PSW.5 - FLAG 0
AC        BIT   0D6H  ;PSW.6 - AUXILIARY CARRY FLAG
CY        BIT   0D7H  ;PSW.7 - CARRY FLAG
MASTER    BIT   099H  ;I2CON.1  - READ MASTER OR SLAVE
STP       BIT   09AH  ;I2CON.2  - READ STOP
STR       BIT   09BH  ;I2CON.3  - READ START
ARL       BIT   09CH  ;I2CON.4  - READ ARBITRATION LOSS
DRDY      BIT   09DH  ;I2CON.5  - READ DATA READY
ATN       BIT   09EH  ;I2CON.6  - READ ATTENTION
RDAT      BIT   09FH  ;I2CON.7  - READ RECEIVE DATA
XSTP      BIT   098H  ;I2CON.0  - WRITE XMIT STOP
XSTR      BIT   099H  ;I2CON.1  - WRITE XMIT REPEATED START
CSTP      BIT   09AH  ;I2CON.2  - WRITE CLEAR STOP
CSTR      BIT   09BH  ;I2CON.3  - WRITE CLEAR START
CARL      BIT   09CH  ;I2CON.4  - WRITE CLEAR ARBITRATION LOSS
CDR       BIT   09DH  ;I2CON.5  - WRITE CLEAR DATA READY
IDLE      BIT   09EH  ;I2CON.6  - WRITE GO IDLE
CXA       BIT   09FH  ;I2CON.7  - WRITE CLEAR XMIT ACTIVE
CT0       BIT   0D8H  ;I2CFG.0 - TIMING BIT
CT1       BIT   0D9H  ;I2CFG.1 - TIMING BIT
TIRUN     BIT   0DCH  ;I2CFG.4 - ENABLE/DISABLE TIMER 1
CLRTI     BIT   0DDH  ;I2CFG.5 - CLEAR TIMER 1 INTERRUPT FLAG
MASTRQ    BIT   0DEH  ;I2CFG.6 - REQUEST MASTERSHIP OF I2C
SLAVEN    BIT   0DFH  ;I2CFG.7 - ENABLE I2C SLAVE FUNCTIONALITY
RSTP      BIT   0F8H  ;I2STA.0 - READ - TRANSMIT STOP CONDITION
RSTR      BIT   0F9H  ;I2STA.1 - READ - TRANSMIT REPEATED START CONDITION
MAKSTP    BIT   0FAH  ;I2STA.2 - READ - STOP CONDITION
MAKSTR    BIT   0FBH  ;I2STA.3 - READ - START CONDITION
XACTV     BIT   0FCH  ;I2STA.4 - READ - TRANSMITTER ACTIVE
XDATA     BIT   0FDH  ;I2STA.5 - READ - CONTENT OF TRANSMITTER BUFFER
RIDLE     BIT   0FEH  ;I2STA.6 - READ - SLAVE IDLE FLAG