A - 1

SFR Page Reference ........................................................................................................................... B - 1

1.

Overview ......................................................................................................................................... 1

1.1

Features ..................................................................................................................................................... 1

1.1.1

Applications .......................................................................................................................................... 1

1.1.2

Specifications ........................................................................................................................................ 2

1.2

Product List ............................................................................................................................................... 6

1.3

Block Diagram ......................................................................................................................................... 9

1.4

Pin Assignment ........................................................................................................................................ 10

1.5

Pin Functions ........................................................................................................................................... 13

2.

Central Processing Unit (CPU) ..................................................................................................... 15

2.1

Data Registers (R0, R1, R2, and R3) ...................................................................................................... 16

2.2

Address Registers (A0 and A1) ............................................................................................................... 16

2.3

Frame Base Register (FB) ....................................................................................................................... 16

2.4

Interrupt Table Register (INTB) .............................................................................................................. 16

2.5

Program Counter (PC) ............................................................................................................................. 16

2.6

User Stack Pointer (USP) and Interrupt Stack Pointer (ISP) .................................................................. 16

2.7

Static Base Register (SB) ........................................................................................................................ 16

2.8

Flag Register (FLG) ................................................................................................................................ 16

2.8.1

Carry Flag (C) ..................................................................................................................................... 16

2.8.2

Debug Flag (D) ................................................................................................................................... 16

2.8.3

Zero Flag (Z) ....................................................................................................................................... 16

2.8.4

Sign Flag (S) ....................................................................................................................................... 16

2.8.5

Register Bank Select Flag (B) ............................................................................................................ 16

2.8.6

Overflow Flag (O) .............................................................................................................................. 16

2.8.7

Interrupt Enable Flag (I) ..................................................................................................................... 17

2.8.8

Stack Pointer Select Flag (U) .............................................................................................................. 17

2.8.9

Processor Interrupt Priority Level (IPL) ............................................................................................. 17

2.8.10

Reserved Bit ........................................................................................................................................ 17

3.

Memory ......................................................................................................................................... 18

3.1

R8C/2C Group ......................................................................................................................................... 18

3.2

R8C/2D Group ........................................................................................................................................ 19

4.

Special Function Registers (SFRs) ............................................................................................... 20

5.

Resets ........................................................................................................................................... 32

5.1

Hardware Reset ....................................................................................................................................... 35

5.1.1

When Power Supply is Stable ............................................................................................................. 35

5.1.2

Power On ............................................................................................................................................ 35

5.2

Power-On Reset Function ....................................................................................................................... 37

5.3

Voltage Monitor 0 Reset ......................................................................................................................... 38

5.4

Voltage Monitor 1 Reset ......................................................................................................................... 38

5.5

Voltage Monitor 2 Reset ......................................................................................................................... 38

5.6

Watchdog Timer Reset ............................................................................................................................ 39

5.7

Software Reset ......................................................................................................................................... 39

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