AT89C5132-ROTIL datasheet(27/182 Pages) ATMEL

27 / 182 page

4173E–USB–09/07

AT89C5132

8.4

Registers

Table 13. PSW Register

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

Reset Value = 0000 0000b

Table 14. AUXR Register

AUXR (S:8Eh) – Auxiliary Control Register

RS1

RS0

Bit Number

Bit

Mnemonic

Description

Carry Flag

Carry out from bit 1 of ALU operands.

Auxiliary Carry Flag

Carry out from bit 1 of addition operands.

User Definable Flag 0.

4 - 3

RS1:0

Refer to Table 10 for Bits description.

Overflow Flag

Overflow set by arithmetic operations.

User 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.

EXT16

DPHDIS

XRS1

XRS0

EXTRAM

Bit Number

Bit

Mnemonic

Description

Reserved

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

EXT16

External 16-bit Access Enable Bit

Set to enable 16-bit access mode during MOVX instructions.

Clear to disable 16-bit access mode and enable standard 8-bit access mode during

MOVX instructions.

External Memory Access Stretch Bit

Set to stretch RD or WR signals duration to 15 CPU clock periods.

Clear not to stretch RD or WR signals and set duration to 3 CPU clock periods.

DPHDIS

DPH Disable Bit

Set to disable DPH output on P2 when executing MOVX @DPTR instruction.

Clear to enable DPH output on P2 when executing MOVX @DPTR instruction.

3 - 2

XRS1:0

Expanded RAM Size Bits

Refer to Table 11 for ERAM size description.

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