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Cpu Segment Pointer Registers - HP 3000 III Series Manual

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System/CPU Overview

CODE SEGMENT

POINTING

REGISTERS

PB

CODE

Stack

Bank

SEGMENT

Bank

01

PB Register

D

r

...

(Program Basel

DB

Bank

D

I

P Register

~

(Program Counter!

D

INCREASING

ADDRESSES

DATA SEGMENT

POINTING

REGISTERS

I

Pl Register

(Program Limitl

L

.....

I

~~:~,C~!.

·{

-0,1,2,3,4

I

Dl Register

I

r

--

(Data Limitl

I

DB Register

~

....

(Data Basel

I

a

Register

t

.....

(Stack Marker)

(Top-of-Stack in Memoryl

I

SMRegister

L

.-"0.

I

r-------,

L _ _

~~.!r

_ _

(Logical Top-of-Stackl

I

Z Register

L

.....

I

(Stack Limitl

DATA

SEGMENT

Figure 2-4.

CPU Segment Pointer Registers

2-23.

DATA SEGMENT REGISTERS.

The functions

of the

CPU

data

segment (stack) registers are as follows:

The DL

ment.

ing to

space.

Register

defines the data limit of the current

data seg-

The DL Register contains a l6-bit absolute address point-

the

first word of memory

available

to

the user's

data

2-13

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