Rainbow-electronics T89C51CC02 Manual de usuario descargar pdf (Pagina 31)

Rev.A - May 17, 2001 31

Preliminary

T89C51CC02

8.4. Registers

PSW (S:8Eh)

Program Status Word Register.

Reset Value= 0000 0000b

Figure 16. PSW Register

AUXR1 (S:A2h)

Auxiliary Control Register 1.

Reset Value= XXXX 00X0b

Figure 17. AUXR1 Register

7 6 5 4 3 2 1 0

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 15 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.

7 6 5 4 3 2 1 0

- - ENBOOT - GF3 0 - DPS

Bit Number Bit Mnemonic Description

7-6 -

Reserved

The value read from these bits is indeterminate. Do not set these bits.

5 ENBOOT

Enable Boot Flash

Set this bit for map the boot flash between F800h -FFFFh

Clear this bit for disable boot flash.

Reserved

The value read from this bit is indeterminate. Do not set this bit.

3 GF3 General Purpose Flag 3.

Always Zero

This bit is stuck to logic 0 to allow INC AUXR1 instruction without affecting GF3 flag.

1-Reserved for Data Pointer Extension.

0 DPS

Data Pointer Select Bit

Set to select second dual data pointer: DPTR1.

Clear to select first dual data pointer: DPTR0.

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 136 137

T89C51CC02 1

Comentarios a estos manuales

Sin comentarios

Rainbow-electronics T89C51CC02 Manual de usuario Pagina 31

Comentarios a estos manuales

Relacionado con productos y manuales para Sensores Rainbow-electronics T89C51CC02