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CROSS ASSEMBLER->Predefined Symbols->Predefined Bit Addresses for 8051

    

	CY	PSW.7	D7H	Carry flag
	AC	PSW.6	D6H	Auxialiary carry flag
	F0	PSW.5	D5H	Flag 0
	RS1	PSW.4	D4H	Register bank select bit 1
	RS0	PSW.3	D3H	Register bank select bit 0
	OV	PSW.2	D2H	Overflow flag
	P	PSW.0	D0	Parity flag

    

	TF1	TCON.7	8FH	Timer 1 overflow flag
	TR1	TCON.6	8EH	Timer 1 run control bit
	TF0	TCON.5	8DH	Timer 0 overflow flag
	TR0	TCON.4	8CH	Timer 0 run control bit
	IE1	TCON.3	8BH	Interrupt 1 edge flag
	IT1	TCON.2	8AH	Interrupt 1 type control bit
	IE0	TCON.1	89H	Interrupt 0 edge flag
	IT0	TCON.0	88H	Interrupt 0 type control bit
	SM0	SCON.7	9FH	Serial mode control bit 0
	SM1	SCON.6	9EH	Serial mode control bit 1
	SM2	SCON.5	9DH	Serial mode control bit 2
	REN	SCON.4	9CH	Receiver enable
	TB8	SCON.3	9BH	Transmit bit 8
	RB8	SCON.2	9AH	Receive bit 8
	TI	SCON.1	99H	Transmit interrupt flag
	RI	SCON.0	98H	Receive interrupt flag

    

	EA	IE.7	AFH	Enable all interrupts
	ES	IE.4	ACH	Enable serial port interrupt
	ET1	IE.3	ABH	Enable timer 1 interrupt
	EX1	IE.2	AAH	Enable external interrupt 1
	ET0	IE.1	A9H	Enable timer 0 interrupt
	EX0	IE.0	A8H	Enable external interrupt 0

    

	RD	P3.7	B7H	Read data for external memory
	WR	P3.6	B6H	Write data for external memory
	T1	P3.5	B5H	Timer/counter 1 external flag
	T0	P3.4	B4H	Timer/counter 0 external flag
	INT1	P3.3	B3H	Interrupt 1 input pin
	INT0	P3.2	B2H	Interrupt 0 input pin
	TXD	P3.1	B1H	Serial port transmit pin
	RXD	P3.0	B0H	Serial port receive pin

	PS	IP.4	BCH	Priority of serial port interrupt
	PT1	IP.3	BBH	Priority of timer 1 interrupt
	PX1	IP.2	BAH	Priority of external interrupt 1
	PT0	IP.1	B9H	Priority of timer 0 interrupt
	PX0	IP.0	B8H	Priority of external interrupt 0