4

µPD64A, 65

Data Sheet U14380EJ2V0DS00

CONTENTS

1.

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

6

1.1

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

6

1.2

INPUT/OUTPUT Circuits of Pins ............................................................................................................

7

1.3

Dealing with 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

3.2.4

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 Setup and Release ......................................................................................................... 23

5.3

Standby Mode Release Timing .............................................................................................................. 25

6.

RESET ............................................................................................................................................... 26

7.

POC CIRCUIT ................................................................................................................................... 27

7.1

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

7.2

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

8.

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