PD17225_15 Datasheet, PDF (8/86 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER

µPD17225, 17226, 17227, 17228
CONTENTS
1. PIN FUNCTIONS ........................................................................................................................... 8
1.1 Pin Function List ................................................................................................................................ 8
1.2 Input/Output Circuits ......................................................................................................................... 9
1.3 Processing of Unused Pins .............................................................................................................. 10
2. MEMORY SPACE ......................................................................................................................... 11
2.1 Program Counter (PC) ....................................................................................................................... 11
2.2 Program Memory (ROM) ................................................................................................................... 11
2.3 Stack ................................................................................................................................................... 13
2.4 Data Memory (RAM) ........................................................................................................................... 15
2.5 Register File (RF) ............................................................................................................................... 22
3. PORTS ........................................................................................................................................... 25
3.1 Port 0A (P0A0-P0A3) ........................................................................................................................... 25
3.2 Port 0B (P0B0-P0B3) ........................................................................................................................... 25
3.3 Port 0C (P0C0-P0C3) ........................................................................................................................... 25
3.4 Port 0D (P0D0-P0D3) ........................................................................................................................... 25
3.5 Port 0E (P0E0-P0E3) ........................................................................................................................... 25
3.6 INT Pin ................................................................................................................................................. 26
3.7 Switching Bit I/O ................................................................................................................................ 27
3.8 Specifying Pull-up Resistor Connection ......................................................................................... 28
4. CLOCK GENERATOR CIRCUIT .................................................................................................. 29
4.1 Instruction Execution Time (CPU Clock) Selection ........................................................................ 29
5. 8-BIT TIMER AND REMOTE CONTROLLER CARRIER GENERATOR CIRCUIT ..................... 30
5.1 Configuration of 8-bit Timer (with modulo function) ..................................................................... 30
5.2 Function of 8-bit Timer (with modulo function) .............................................................................. 32
5.3 Carrier Generator Circuit for Remote Controller ............................................................................ 33
6. BASIC INTERVAL TIMER/WATCHDOG TIMER .......................................................................... 37
6.1 Source Clock for Basic Interval Timer ............................................................................................. 37
6.2 Controlling Basic Interval Timer ...................................................................................................... 37
6.3 Operation Timing for Watchdog Timer ............................................................................................ 39
7. INTERRUPT FUNCTIONS ............................................................................................................ 40
7.1 Interrupt Sources ............................................................................................................................... 40
7.2 Hardware of Interrupt Control Circuit .............................................................................................. 41
7.3 Interrupt Sequence ............................................................................................................................ 44
6
Data Sheet U12643EJ2V0DS00