UPD17068 datasheet(8/341 Pages) NEC

8 / 341 page

µPD17068

CONTENTS

PIN FUNCTIONS .........................................................................................................................

1.1

LIST OF PIN FUNCTIONS ..............................................................................................................

1.2

EQUIVALENT CIRCUIT OF EACH PIN ..........................................................................................

1.3

HANDLING UNUSED PINS ............................................................................................................

1.4

NOTES ON USE OF THE CE AND INTNC PINS ............................................................................

PROGRAM MEMORY (ROM) ....................................................................................................

2.1

OUTLINE OF PROGRAM MEMORY ..............................................................................................

2.2

PROGRAM MEMORY CONFIGURATION .....................................................................................

2.3

PROGRAM COUNTER ....................................................................................................................

2.3.1

Program Counter Configuration ..................................................................................

2.3.2

Segment Register (SGR) ...............................................................................................

2.4

PROGRAM FLOW ...........................................................................................................................

2.4.1

Branch Instructions ........................................................................................................

2.4.2

Subroutines .....................................................................................................................

2.4.3

Table Reference ..............................................................................................................

2.4.4

System Call .....................................................................................................................

2.5

NOTES ON USE OF PROGRAM MEMORY ..................................................................................

2.5.1

Program Counter and Program Memory Size ...........................................................

2.5.2

Last Address of Each Segment ....................................................................................

ADDRESS STACK (ASK) ............................................................................................................

3.1

OUTLINE OF ADDRESS STACK ....................................................................................................

3.2

ADDRESS STACK REGISTERS (ASR) ..........................................................................................

3.3

STACK POINTER (SP) ....................................................................................................................

3.3.1

Configuration and Function of Stack Pointer ............................................................

3.4

ADDRESS STACK OPERATION .....................................................................................................

3.4.1

Subroutine Call Instruction (“CALL addr” or “CALL @AR”) and

Return Instruction (“RET” or “RETSK”) .....................................................................

3.4.2

Table Reference Instruction (“MOVT DBF, @AR”) ....................................................

3.4.3

Interrupt Reception and Return Instruction (“RETI”) ...............................................

3.4.4

Address Stack Manipulation Instructions (“PUSH AR”, “POP AR”) ......................

3.4.5

System Call Instruction (“SYSCAL entry”) and Return Instruction

(“RET” or “RETSK”) .......................................................................................................

3.5

NOTES ON USE OF ADDRESS STACK ........................................................................................

3.5.1

Nesting Level ..................................................................................................................

DATA MEMORY (RAM) .............................................................................................................

4.1

OUTLINE OF DATA MEMORY ......................................................................................................

4.2

CONFIGURATION AND FUNCTIONS OF DATA MEMORY .......................................................

4.2.1

System Register (SYSREG) ...........................................................................................

4.2.2

Data Buffer (DBF) ...........................................................................................................

4.2.3

VRAM (Video RAM) for the IDC ...................................................................................

4.2.4

Port Register ...................................................................................................................

4.2.5

General-Purpose Data memory ....................................................................................

4.2.6

Unmounted Data Memory ............................................................................................

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