HPC16004 datasheet(28/36 Pages) NSC

28 / 36 page

HPC46064 CPU (Continued)

Accumulator (A) Register

The 16-bit A register is the source and destination register

for most IO arithmetic logic and data memory access op-

erations

Address (B and X) Registers

The 16-bit B and X registers can be used for indirect ad-

dressing They can automatically count up or down to se-

quence through data memory

Boundary (K) Register

The 16-bit K register is used to set limits in repetitive loops

of code as register B sequences through data memory

Stack Pointer (SP) Register

The 16-bit SP register is the pointer that addresses the

stack The SP register is incremented by two for each push

or call and decremented by two for each pop or return The

stack can be placed anywhere in user memory and be as

deep as the available memory permits

Program (PC) Register

The 16-bit PC register addresses program memory

Addressing Modes

ADDRESSING MODESACCUMULATOR AS

DESTINATION

This is the ‘‘normal’’ mode of addressing for the HPC46064

(instructions are single-byte) The operand is the memory

addressed by the B register (or X register for some instruc-

tions)

Direct

The instruction contains an 8-bit or 16-bit address field that

directly points to the memory for the operand

Indirect

The instruction contains an 8-bit address field The contents

of the WORD addressed points to the memory for the oper-

and

Indexed

The instruction contains an 8-bit address field and an 8- or

16-bit displacement field The contents of the WORD ad-

dressed is added to the displacement to get the address of

the operand

Immediate

The instruction contains an 8-bit or 16-bit immediate field

that is used as the operand

The operand is the memory addressed by the X register

This mode automatically increments or decrements the X

with Conditional Skip

The operand is the memory addressed by the B register

This mode automatically increments or decrements the B

then compared with the K register A skip condition is gener-

ated if B goes past K

ADDRESSING MODESDIRECT MEMORY AS

DESTINATION

Direct Memory to Direct Memory

The instruction contains two 8- or 16-bit address fields One

field directly points to the source operand and the other field

directly points to the destination operand

Immediate to Direct Memory

The instruction contains an 8- or 16-bit address field and an

8- or 16-bit immediate field The immediate field is the oper-

and and the direct field is the destination

Double Register Indirect Using the B and X Registers

Used only with Reset Set and IF bit instructions a specific

bit within the 64 kbyte address range is addressed using the

B and X registers The address of a byte of memory is

formed by adding the contents of the B register to the most

significant 13 bits of the X register The specific bit to be

modified or tested within the byte of memory is selected

using the least significant 3 bits of register X

HPC Instruction Set Description

Mnemonic

Description

Action

ARITHMETIC INSTRUCTIONS

ADD

Add

MAaMemI

xMA

carry

ADC

Add with carry

MAaMemIaC

xMA

carry

ADDS

Add short imm8

Aaimm8

carry

DADC

Decimal add with carry

MAaMemIaC

xMA (Decimal)

carry

x C

SUBC

Subtract with carry

MAbMemIaC

xMA

carry

DSUBC

Decimal subtract wcarry

MAbMemIaC

xMA (Decimal)

carry

MULT

Multiply (unsigned)

MA MemI

xMAX 0xK 0xC

DIV

Divide (unsigned)

MAMemI

xMA rem xX 0xK 0x C

DIVD

Divide Double Word (unsigned)

MAMemI

xMA remxX 0xK CarryxC

IFEQ

If equal

Compare MA

MemI Do next if equal

IFGT

If greater than

Compare MA

MemI Do next if MA l MemI

AND

Logical and

MA and MemI

xMA

Logical or

MA or MemI

xMA

XOR

Logical exclusive-or

MA xor MemI

xMA

MEMORY MODIFY INSTRUCTIONS

INC

Increment

Mem a 1

xMem

DECSZ

Decrement skip if 0

Mem b1

xMem Skip next if Mem

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