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UPD17241

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

NEC => Renesas Technology 

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

Data Sheet U15002EJ1V0DS

7

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