UPD78323LP datasheet(9/86 Pages) NEC

9 / 86 page

µPD78323, 78324

CONTENTS

LIST OF PIN FUNCTIONS ..................................................................................................................... 11

1.1

PORT PINS ...................................................................................................................................................... 11

1.2

PINS OTHER THAN PORTS .......................................................................................................................... 12

1.3

PIN INPUT/OUTPUT CIRCUITS AND RECOMMENDED CONNECTION OF UNUSED PINS ................... 14

CPU ARCHITECTURE ............................................................................................................................ 16

2.1

MEMORY SPACE ............................................................................................................................................ 16

2.2

PROCESSOR REGISTERS ............................................................................................................................ 19

2.2.1

Control Registers ........................................................................................................................... 20

2.2.2

General Registers ........................................................................................................................... 22

2.2.3

Special Function Registers (SFR) ................................................................................................ 24

2.3

DATA MEMORY ADDRESSING ..................................................................................................................... 29

2.3.1

General Register Addressing ....................................................................................................... 29

2.3.2

Short Direct Addressing ................................................................................................................ 29

2.3.3

Special Function Register (SFR) Addressing ............................................................................ 29

BLOCK FUNCTIONS .............................................................................................................................. 30

3.1

BUS CONTROL UNIT (BCU) .......................................................................................................................... 30

3.2

EXECUTION UNIT (EXU) ................................................................................................................................30

3.3

ROM/RAM ........................................................................................................................................................ 30

3.4

INTERRUPT CONTROLLER .......................................................................................................................... 30

3.5

PORT FUNCTIONS ......................................................................................................................................... 31

3.6

CLOCK GENERATOR .................................................................................................................................... 32

3.7

REALTIME PULSE UNIT (RPU) ..................................................................................................................... 34

3.7.1

Configuration .................................................................................................................................. 34

3.7.2

Realtime Output Function ............................................................................................................. 36

3.8

A/D CONVERTER ........................................................................................................................................... 37

3.9

SERIAL INTERFACE ...................................................................................................................................... 37

3.10 WATCHDOG TIMER ....................................................................................................................................... 40

INTERRUPT FUNCTIONS ...................................................................................................................... 41

4.1

OVERVIEW ...................................................................................................................................................... 41

4.2

MACRO SERVICE ........................................................................................................................................... 42

4.3

CONTEXT SWITCHING FUNCTION .............................................................................................................. 44

4.3.1

Context Switching Function at Interrupt Request ..................................................................... 44

4.3.2

Context Switching Function by BRKCS Instruction ................................................................. 45

STANDBY FUNCTIONS ......................................................................................................................... 46

EXTERNAL DEVICE EXPANSION FUNCTION .................................................................................... 47

OPERATION AFTER RESET ................................................................................................................. 48

INSTRUCTION SET ................................................................................................................................49

ELECTRICAL SPECIFICATIONS .......................................................................................................... 63

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