r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 75
r8a77850anbg
Manufacturer Part Number
r8a77850anbg
Description
Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R8A77850ANBG.pdf
(1692 pages)
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This LSI's instruction set is implemented with 16-bit fixed-length instructions. This LSI can use
byte (8-bit), word (16-bit), longword (32-bit), and quadword (64-bit) data sizes for memory
access. Single-precision floating-point data (32 bits) can be moved to and from memory using
longword or quadword size. Double-precision floating-point data (64 bits) can be moved to and
from memory using longword size. When this LSI moves byte-size or word-size data from
memory to a register, the data is sign-extended.
3.1
(1)
At the start of instruction execution, the PC indicates the address of the instruction itself.
(2)
This LSI has a load-store architecture in which operations are basically executed using registers.
Except for bit-manipulation operations such as logical AND that are executed directly in memory,
operands in an operation that requires memory access are loaded into registers and the operation is
executed between the registers.
(3)
Except for the two branch instructions BF and BT, this LSI's branch instructions and RTE are
delayed branches. In a delayed branch, the instruction following the branch is executed before the
branch destination instruction.
(4)
This execution slot following a delayed branch is called a delay slot. For example, the BRA
execution sequence is as follows:
PC
Load-Store Architecture
Delayed Branches
Delay Slot
Execution Environment
Section 3 Instruction Set
Rev.1.00 Jan. 10, 2008 Page 45 of 1658
REJ09B0261-0100
3. Instruction Set
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