D6P8A View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

D6P8A

4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION

NEC => Renesas Technology 

µPD6P8, 6P8A, 6P8B

CONTENTS

1. PIN FUNCTIONS ......................................................................................................................... 8

1.1 Normal Operation Mode .................................................................................................................... 8

1.2 PROM Programming Mode ............................................................................................................... 10

1.3 Pins I/O Circuits ................................................................................................................................. 11

1.4 Recommended Connection of Unused Pins ................................................................................... 12

1.5 Notes on Using KI Pin After Reset ................................................................................................... 12

2. DIFFERENCES BETWEEN µPD67A, 67B, 68A, 68B, AND µPD6P8, 6P8A, 6P8B .................. 13

3. INTERNAL CPU FUNCTIONS .................................................................................................. 14

3.1 Program Counter (PC): 11 Bits ........................................................................................................ 14

3.2 Stack Pointer (SP): 1 Bit ................................................................................................................... 14

3.3 Address Stack Register (ASR (RF)): 11 Bits ................................................................................... 14

3.4 Program Memory (One-Time PROM): 2,026 Steps × 10 Bits ......................................................... 15

3.5 Data Memory (RAM): 32 × 4 Bits ...................................................................................................... 16

3.6 Data Pointer (DP): 12 Bits ................................................................................................................. 17

3.7 Accumulator (A): 4 Bits .................................................................................................................... 17

3.8 Arithmetic and Logic Unit (ALU): 4 Bits .......................................................................................... 17

3.9 Flags ................................................................................................................................................... 18

3.9.1 Status flag (F) .......................................................................................................................... 18

3.9.2 Carry flag (CY) ........................................................................................................................ 18

4. PORT REGISTERS (PX) ........................................................................................................... 19

4.1 KI/O Port (P0) ....................................................................................................................................... 20

4.2 KI Port/Special Ports (P1) ................................................................................................................. 20

4.2.1 KI port (P11: bits 4 to 7 of P1) .................................................................................................. 20

4.2.2 S0 port (bit 2 of P1) .................................................................................................................. 21

4.2.3 S1/LED port (bit 3 of P1) .......................................................................................................... 21

4.2.4 S2 port (bit 1 of P1) .................................................................................................................. 21

4.3 Control Register 0 (P3) ..................................................................................................................... 22

4.3.1 RAM retention flag (bit 3 of P3) ............................................................................................... 23

4.4 Control Register 1 (P4) ..................................................................................................................... 25

5. TIMER ......................................................................................................................................... 26

5.1 Timer Configuration .......................................................................................................................... 26

5.2 Timer Operation ................................................................................................................................. 27

5.3 Carrier Output .................................................................................................................................... 29

5.3.1 Carrier output generator .......................................................................................................... 29

5.3.2 Carrier output control .............................................................................................................. 30

5.4 Software Control of Timer Output ................................................................................................... 32

6. STANDBY FUNCTION ............................................................................................................... 33

6.1 Outline of Standby Function ............................................................................................................ 33

6.2 Standby Mode Setting and Release ................................................................................................. 34

6.3 Standby Mode Release Timing ........................................................................................................ 36

7. RESET ......................................................................................................................................... 37

6

Data Sheet U17848EJ3V0DS

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