R5F3640MCDFB datasheet(15/91 Pages) RENESAS

15 / 91 page

R01DS0016EJ0100 Rev.1.00

Page 15 of 88

Feb 07, 2011

M16C/64C Group

2. Central Processing Unit (CPU)

2.1

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

R0, R1, R2, and R3 are 16-bit registers used for transfer, arithmetic, and logic operations. R0 and R1 can

be split into upper (R0H/R1H) and lower (R0L/R1L) bits to be used separately as 8-bit data registers.

R0 can be combined with R2, and R3 can be combined with R1 and be used as 32-bit data registers

R2R0 and R3R1, respectively.

2.2

Address Registers (A0 and A1)

A0 and A1 are 16-bit registers used for indirect addressing, relative addressing, transfer, arithmetic, and

logic operations. A0 can be combined with A1 and used as a 32-bit address register (A1A0).

2.3

Frame Base Register (FB)

FB is a 16-bit register that is used for FB relative addressing.

2.4

Interrupt Table Register (INTB)

INTB is a 20-bit register that indicates the start address of a relocatable interrupt vector table.

2.5

Program Counter (PC)

The PC is 20 bits wide and indicates the address of the next instruction to be executed.

2.6

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

The USP and ISP stack pointers (SP) are each comprised of 16 bits. The U flag is used to switch between

USP and ISP.

2.7

Static Base Register (SB)

SB is a 16-bit register used for SB relative addressing.

2.8

Flag Register (FLG)

FLG is an 11-bit register that indicates the CPU state.

2.8.1

Carry Flag (C Flag)

The C flag retains a carry, borrow, or shift-out bit generated by the arithmetic/logic unit.

2.8.2

Debug Flag (D Flag)

The D flag is for debugging only. Set it to 0.

2.8.3

Zero Flag (Z Flag)

The Z flag becomes 1 when an arithmetic operation results in 0. Otherwise, it becomes 0.

2.8.4

Sign Flag (S Flag)

The S flag becomes 1 when an arithmetic operation results in a negative value. Otherwise, it becomes

2.8.5

2.8.6

Overflow Flag (O Flag)

The O flag becomes 1 when an arithmetic operation results in an overflow. Otherwise, it becomes 0.

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