HD6437101 RENESAS [Renesas Technology Corp], HD6437101 Datasheet - Page 54

• Manufacturer Part Number: HD6437101
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 2 CPU
Word or longword immediate data is not located in the instruction code, but instead is stored in a
memory table. An immediate data transfer instruction (MOV) accesses the memory table using the
PC relative addressing mode with displacement.
2.4
2.4.1
All instructions are RISC type. This section details their functions.
16-Bit Fixed Length: All instructions are 16 bits long, increasing program code efficiency.
One Instruction per State: The microprocessor can execute basic instructions in one state using
the pipeline system. One state is 25 ns at 40 MHz.
Data Length: Longword is the standard data length for all operations. Memory can be accessed in
bytes, words, or longwords. Byte or word data accessed from memory is sign-extended and
handled as longword data. Immediate data is sign-extended for arithmetic operations or zero-
extended for logic operations. It also is handled as longword data.
Table 2.2
CPU of This LSI
MOV.W
ADD
.DATA.W
Note: @(disp, PC) accesses the immediate data.
Load-Store Architecture: Basic operations are executed between registers. For operations that
involve memory access, data is loaded to the registers and executed (load-store architecture).
Instructions such as AND that manipulate bits, however, are executed directly in memory.
Delayed Branch Instructions: Unconditional branch instructions are delayed branch instructions.
With a delayed branch instruction, the branch is taken after execution of the instruction following
the delayed branch instruction. This reduces the disturbance of the pipeline control in case of
branch instructions. There are two types of conditional branch instructions: delayed branch
instructions and ordinary branch instructions.
Rev.1.00 Sep. 18, 2008 Page 20 of 522
REJ09B0069-0100
Instruction Features
RISC-Type Instruction Set
@(disp,PC),R1
R1,R0
.........
H'1234
Sign Extension of Word Data
Description
Data is sign-extended to 32
bits, and R1 becomes
H'00001234. It is next
operated upon by an ADD
instruction.
Example of Conventional CPU
ADD.W
#H'1234,R0