r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 64

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

2. Programming Model
Rev.1.00 Jan. 10, 2008 Page 34 of 1658
REJ09B0261-0100
Bit
27 to 16 —
15
14 to 10 —
9
8
7 to 4
3, 2
1
0
Bit Name
FD
M
Q
IMASK
—
S
T
Initial
Value
All 0
0
All 0
0
0
1111
All 0
0
0
R/W
R
R/W
R
R/W
R/W
R/W
R
R/W
R/W
Description
Reserved
For details on reading/writing this bit, see General
Precautions on Handling of Product.
FPU Disable Bit
When this bit is set to 1 and an FPU instruction is not in
a delay slot, a general FPU disable exception occurs.
When this bit is set to 1 and an FPU instruction is in a
delay slot, a slot FPU disable exception occurs. (FPU
instructions: H'F*** instructions and LDS (.L)/STS(.L)
instructions using FPUL/FPSCR)
Reserved
For details on reading/writing this bit, see General
Precautions on Handling of Product.
M Bit
Used by the DIV0S, DIV0U, and DIV1 instructions.
Q Bit
Used by the DIV0S, DIV0U, and DIV1 instructions.
Interrupt Mask Level Bits
An interrupt whose priority is equal to or less than the
value of the IMASK bits is masked. It can be chosen by
CPU operation mode register (CPUOPM) whether the
level of IMASK is changed to accept an interrupt or not
when an interrupt is occurred. For details, see appendix
A, CPU Operation Mode Register (CPUOPM).
Reserved
For details on reading/writing this bit, see General
Precautions on Handling of Product.
S Bit
Used by the MAC instruction.
T Bit
Indicates true/false condition, carry/borrow, or
overflow/underflow.
For details, see section 3, Instruction Set.