r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 44

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.8.1
2.8.2
2.8.3
2.8.4
2.8.5
2.8.6
R0 is a 16-bit register for transfer, arithmetic, and logic operations. The same applies to R1 to R3. R0 can be split
into high-order bits (R0H) and low-order bits (R0L) to be used separately as 8-bit data registers. R1H and R1L are
analogous to R0H and R0L. R2 can be combined with R0 and used as a 32-bit data register (R2R0). R3R1 is
analogous to R2R0.
A0 is a 16-bit register for address register indirect addressing and address register relative addressing. It is also
used for transfer, arithmetic, and logic operations. A1 is analogous to A0. A1 can be combined with A0 and as a 32-
bit address register (A1A0).
FB is a 16-bit register for FB relative addressing.
INTB is a 20-bit register that indicates the starting address of an interrupt vector table.
PC is 20 bits wide and indicates the address of the next instruction to be executed.
The stack pointers (SP), USP and ISP, are each 16 bits wide. The U flag of FLG is used to switch between
USP and ISP.
SB is a 16-bit register for SB relative addressing.
FLG is an 11-bit register indicating the CPU state.
The C flag retains carry, borrow, or shift-out bits that have been generated by the arithmetic and logic unit.
The D flag is for debugging only. Set it to 0.
The Z flag is set to 1 when an arithmetic operation results in 0; otherwise to 0.
The S flag is set to 1 when an arithmetic operation results in a negative value; otherwise to 0.
Register bank 0 is selected when the B flag is 0. Register bank 1 is selected when this flag is set to 1.
The O flag is set to 1 when an operation results in an overflow; otherwise to 0.
Data Registers (R0, R1, R2, and R3)
Address Registers (A0 and A1)
Frame Base Register (FB)
Interrupt Table Register (INTB)
Program Counter (PC)
User Stack Pointer (USP) and Interrupt Stack Pointer (ISP)
Static Base Register (SB)
Flag Register (FLG)
Carry Flag (C)
Debug Flag (D)
Zero Flag (Z)
Sign Flag (S)
Register Bank Select Flag (B)
Overflow Flag (O)
2. Central Processing Unit (CPU)
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