78K datasheet(9/129 Pages) NEC

9 / 129 page

User's Manual U12326EJ4V0UM

CONTENTS

CHAPTER 1 MEMORY SPACE ............................................................................................................... 12

1.1

Memory Spaces ................................................................................................................12

1.2

Internal Program Memory (Internal ROM) Space .......................................................... 12

1.3

Vector Table Area ............................................................................................................. 12

1.4

CALLT Instruction Table Area ......................................................................................... 12

1.5

CALLF Instruction Entry Area ......................................................................................... 12

1.6

Internal Data Memory (Internal RAM) Space .................................................................. 12

1.7

Special Function Register (SFR) Area ............................................................................ 13

1.8

External Memory Space ................................................................................................... 13

1.9

IEBusTM Register Area ...................................................................................................... 13

CHAPTER 2 REGISTERS ........................................................................................................................ 14

2.1

Control Registers ............................................................................................................. 14

2.1.1

Program counter (PC) ......................................................................................................... 14

2.1.2

Program status word (PSW) ............................................................................................... 14

2.1.3

Stack pointer (SP) ................................................................................................................ 16

2.2

General-Purpose Registers ............................................................................................. 17

2.3

Special Function Registers (SFRs) ................................................................................. 19

CHAPTER 3 ADDRESSING ..................................................................................................................... 20

3.1

Instruction Address Addressing ..................................................................................... 20

3.1.1

Relative addressing ............................................................................................................. 20

3.1.2

Immediate addressing ......................................................................................................... 21

3.1.3

Table indirect addressing ................................................................................................... 22

3.1.4

Register addressing ............................................................................................................ 23

3.2

Operand Address Addressing ........................................................................................ 24

3.2.1

Implied addressing .............................................................................................................. 24

3.2.2

Register addressing ............................................................................................................ 25

3.2.3

Direct addressing ................................................................................................................ 26

3.2.4

Short direct addressing ...................................................................................................... 27

3.2.5

Special-function register (SFR) addressing ...................................................................... 28

3.2.6

Register indirect addressing .............................................................................................. 29

3.2.7

Based addressing ................................................................................................................ 30

3.2.8

Based indexed addressing ................................................................................................. 30

3.2.9

Stack addressing ................................................................................................................. 31

CHAPTER 4 INSTRUCTION SET ............................................................................................................ 32

4.1

Operation ..........................................................................................................................32

4.1.1

Operand identifiers and description methods .................................................................. 32

4.1.2

Description of “operation” column .................................................................................... 33

4.1.3

Description of “flag operation” column ............................................................................ 33

4.1.4

Description of number of clocks ........................................................................................ 34

4.1.5

Instructions listed by addressing type .............................................................................. 34

4.2

Instruction Codes ............................................................................................................. 38

4.2.1

Description of instruction code table ................................................................................ 38

4.2.2

Instruction code list ............................................................................................................. 39

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