ADUC831BCP datasheet(16/76 Pages) AD

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ADuC831

Data Pointer (DPTR)

The Data Pointer is made up of three 8-bit registers, named

DPP (page byte), DPH (high byte) and DPL (low byte). These

are used to provide memory addresses for internal and external

code access and external data access. It may be manipulated as

a 16-bit register (DPTR = DPH, DPL), although INC DPTR

instructions will automatically carry over to DPP, or as three

independent 8-bit registers (DPP, DPH, DPL).

The ADuC831 supports dual data pointers. Refer to the Dual

Data Pointer section.

Program Status Word (PSW)

The PSW SFR contains several bits reflecting the current status

of the CPU as detailed in Table I.

SFR Address

D0H

Power-On Default Value

00H

Bit Addressable

Yes

Table I. PSW SFR Bit Designations

Bit

Name

Description

7CYCarry Flag

6ACAuxiliary Carry Flag

5F0General-Purpose Flag

RS1

RS0

RS1

RS0

Selected Bank

000

011

102

113

2OVOverflow Flag

1F1General-Purpose Flag

Parity Bit

Power Control SFR (PCON)

The PCON SFR contains bits for power-saving options and

general-purpose status flags as shown in Table II.

SFR Address

87H

Power-On Default Value

00H

Bit Addressable

Table II. PCON SFR Bit Designations

Bit

Name

Description

SMOD

Double UART Baud Rate

SERIPD

2C/SPI Power-Down Interrupt Enable

INT0PD

INT0 Power-Down Interrupt Enable

ALEOFF

Disable ALE Output

GF1

General-Purpose Flag Bit

GF0

General-Purpose Flag Bit

1PD

Power-Down Mode Enable

IDL

Idle Mode Enable

ADUC831BCP Datasheet(PDF) 16 Page - Analog Devices

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