Controller Circuit

ACC – Accumulator
B – B register for multiply and divide.

PSW – program status word

PSW.7 – Carry flag (CY)

PSW.6 – Auxiliary carry flag (AC)

PSW.5 – User define

PSW.4 & 3 – Register bank select (RS1, RS0): 00=Bank 0; 01=Bank 1;

10=Bank 2; 11=Bank 3

PSW.2 – Overflow flag (OV)

PSW.1 – User define

PSW.0 – Parity flag (P)
SP – Stack pointer. Initialized to 07H. SP is incremented before data is pushed on the stack.

DPTR – Data pointer (DPH, DPL). To store a 16-bit address for certain instructions.

P0, P1, P2, P3 – Port latches matching the 4 I/O ports.

SBUF – Serial data buffer. Read and write registers for the serial port.

SCON – Serial port control.

TMOD – Timer mode.

TCON – Timer control.

T2CON – 8052 timer 2 control.

PCON – Power control. Use in the 80C51 only.
IE – Interrupt enable. 1=enable; 0=disable.
IE.7– all interrupts (EA).
IE.6– not used.
IE.5 – timer 2 (ET2). (8052 only). source IE0. interrupt address at 002B.
IE.4 – serial port (ES). source TF0. interrupt address at 0023.
IE.3 – timer 1 (ET1) .source IE1. interrupt address at 001B.
IE.2 – external interrupt 1(EX1). source TF1. interrupt address at 0013.
IE.1 – timer 0 (ET0). source R1 & T1. interrupt address at 000B.
IE.0 – external interrupt 0 (EX0). source TF2 & EXF2. interrupt address at 0003.
IP – Interrupt priority. 1=high priority; 0=low priority.
IP.7 – not used.
IP.6 – not used.
IP.5 – timer 2 (PT2). (8052 only).
IP.4 – serial port (PS).
IP.3 – timer 1 (PT1).
IP.2 – external interrupt 1 (PX1).
IP.1 – timer 0 (PT0).
IP.0 – external interrupt 0 (PX0).
RCAP2L – 8052 only.




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