UPD17243MC-XXX-5A4 datasheet(7/102 Pages) NEC

Part #	UPD17243MC-XXX-5A4

Description	4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS

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Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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7

Data Sheet U15002EJ1V0DS

µPD17240, 17241, 17242, 17243, 17244, 17245, 17246

CONTENTS

1.

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

9

1.1

Pin Function List ...............................................................................................................

9

1.2

I/O Circuits .........................................................................................................................

12

1.3

Handling of Unused Pins .................................................................................................

14

2.

MEMORY SPACE .........................................................................................................................

15

2.1

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

15

2.2

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

18

2.3

Stack ...................................................................................................................................

20

2.4

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

22

2.5

Register File (RF) ..............................................................................................................

31

3.

PORTS ..........................................................................................................................................

34

3.1

Port 0A (P0A0 to P0A3) .....................................................................................................

34

3.2

Port 0B (P0B0 to P0B3) .....................................................................................................

34

3.3

Port 0C (P0C0 to P0C3) .....................................................................................................

34

3.4

Port 0D (P0D0 to P0D3) .....................................................................................................

34

3.5

Port 0E (P0E0 to P0E3) ......................................................................................................

35

3.6

Port 1A (P1A0 to P1A2) .....................................................................................................

35

3.7

Port 1B (P1B0) ....................................................................................................................

36

3.8

INT Pin ................................................................................................................................37

3.9

Switching Bit I/O (Port 0B, 0E, 1A) .................................................................................

38

3.10 Selecting I/O Mode of Group I/O (Port 0C, 0D) .............................................................

40

3.11 Selecting Whether Key Matrix Is Used or Not (Port 0E, 1A) .......................................

41

3.12 Specifying Resistor Connection (Port 0E, 1A) .............................................................

42

3.13 Selecting Standby Mode Release Condition and Whether Pull-Up or Pull-Down

Resistor Is Connected (Port 1A) .....................................................................................

44

3.14 Selecting Whether Key Matrix Is Used, Standby Mode Release Condition, and

Whether Pull-Up or Pull-Down Resistor Is Connected (Port 1B) ...............................

46

4.

CLOCK GENERATOR .................................................................................................................

47

4.1

Instruction Execution Time (CPU Clock) Selection ......................................................

47

5.

8-BIT TIMER AND REMOTE CONTROLLER CARRIER GENERATOR ...................................

48

5.1

Configuration of 8-Bit Timer (with Modulo Function) ..................................................

48

5.2

Function of 8-Bit Timer (with Modulo Function) ..........................................................

50

5.3

Carrier Generator for Remote Controller .......................................................................

51

6.

BASIC INTERVAL TIMER/WATCHDOG TIMER .........................................................................

57

6.1

Source Clock for Basic Interval Timer ...........................................................................

57

6.2

Controlling Basic Interval Timer .....................................................................................

57

6.3

Operation Timing for Watchdog Timer ...........................................................................

59

7.

RAM RETENTION DETECTOR ...................................................................................................

60

7.1

RAM Retention Flag ..........................................................................................................

60

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UPD17243MC-XXX-5A4 Datasheet(PDF) 7 Page - NEC

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