Rainbow-electronics AT89C5132 Manuale Utente Scaricare il pdf (Pagina 29)

AT8xC5132

4173A–8051–08/02

Registers Table 27. PSW Register

PSW (S:8Eh) – Program Status Word Register

Reset Value = 0000 0000b

76543210

CY AC F0 RS1 RS0 OV F1 P

Bit

Number

Bit

Mnemonic Description

7CY

Carry Flag

Carry out from bit 1 of ALU operands.

6AC

Auxiliary Carry Flag

Carry out from bit 1 of addition operands.

5F0User Definable Flag 0.

4 - 3 RS1:0

Refer to Table 24 for Bits description.

2OV

Overflow Flag

Overflow set by arithmetic operations.

1F1User Definable Flag 1

Parity Bit

Set when ACC contains an odd number of 1’s.

Cleared when ACC contains an even number of 1’s.

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 161 162

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Rainbow-electronics AT89C5132 Manuale Utente Pagina 29