Rainbow-electronics T89C5115 Manuale Utente Scaricare il pdf (Pagina 24)

T89C5115

4128A–8051–04/02

Registers Table 16. 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 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 ... 19 20 21 22 23 24 25 26 27 28 29 ... 104 105

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Rainbow-electronics T89C5115 Manuale Utente Pagina 24