Rainbow-electronics T89C51CC01 Bedienungsanleitung PDF herunterladen (Seite 26)

T89C51CC01

Rev. D – 17-Dec-01

7.4 Registers Table 3. PSW Register

PSW (S:8Eh)

Program Status Word Register.

Reset Value= 0000 0000b

Table 4. AUXR Register

AUXR (S:8Eh)

Auxiliary Register

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 1 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.

76543210

- - M0 - XRS1 XRS0 EXTRAM A0

Bit

Number

Bit

Mnemonic Description

7-6 -

Reserved

The value read from these bits are indeterminate. Do not set this bit.

5M0

Stretch MOVX control:

the RD/ and the WR/ pulse length is increased according to the value of M0.

M0 Pulse length in clock period

130

Reserved

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

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 148 149

T89C51CC01 1

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