4

µPD62A

Data Sheet U14474EJ1V0DS00

TABLE OF CONTENTS

1. PIN FUNCTIONS ..........................................................................................................................

6

1.1

List of Pin Functions .........................................................................................................................

6

1.2

Pin Input/Output Circuits ..................................................................................................................

7

1.3

Recommended Connection of Unused Pins ...................................................................................

8

2. INTERNAL CPU FUNCTIONS .....................................................................................................

9

2.1

Program Counter (PC) ......................................................................................................................

9

2.2

Stack Pointer (SP) .............................................................................................................................

9

2.3

Address Stack Register (ASR (RF)) .................................................................................................

9

2.4

Program Memory (ROM) ................................................................................................................... 10

2.5

Data Memory (RAM) .......................................................................................................................... 10

2.6

Data Pointer (DP) ............................................................................................................................... 11

2.7

Accumulator (A) ................................................................................................................................ 11

2.8

Arithmetic and Logic Unit (ALU) ...................................................................................................... 12

2.9

Flags ................................................................................................................................................... 12

2.9.1

Status flag (F) .......................................................................................................................... 12

2.9.2

Carry flag (CY) ........................................................................................................................ 13

3. PORT REGISTERS (PX) .............................................................................................................. 14

3.1

3.2

3.2.1

3.2.2

3.2.3

3.3

Control Register 0 (P3) ..................................................................................................................... 17

3.4

Control Register 1 (P4) ..................................................................................................................... 18

4. TIMER ........................................................................................................................................... 19

4.1

Timer Configuration .......................................................................................................................... 19

4.2

Timer Operation ................................................................................................................................. 20

4.3

Carrier Output .................................................................................................................................... 21

4.4

Software Control of Timer Output ................................................................................................... 21

5. STANDBY FUNCTION ................................................................................................................. 22

5.1

Outline of Standby Function ............................................................................................................ 22

5.2

Standby Mode Setting and Release ................................................................................................. 23

5.3

Standby Mode Release Timing ........................................................................................................ 24

6. RESET PIN ................................................................................................................................... 26

7. POC CIRCUIT (MASK OPTION) .................................................................................................. 27

7.1

Functions of POC Circuit .................................................................................................................. 28

7.2

Oscillation Check at Low Supply Voltage ....................................................................................... 28

8. SYSTEM CLOCK OSCILLATOR ................................................................................................. 29