r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 160

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

6. Floating-Point Unit (FPU)
See section 10, Instruction Descriptions of the SH-4A Extended Functions Software Manual for
details of floating-point operations when a non-number (NaN) is input.
6.2.3
Denormalized Numbers
For a denormalized number floating-point value, the exponent field is expressed as 0, and the
fraction field as a non-zero value.
When the DN bit in FPSCR of the FPU is 1, a denormalized number (source operand or operation
result) is always positive or negative zero in a floating-point operation that generates a value (an
operation other than transfer instructions between registers, FNEG, or FABS).
When the DN bit in FPSCR is 0, a denormalized number (source operand or operation result) is
processed as it is. See section 10, Instruction Descriptions of the SH-4A Extended Functions
Software Manual for details of floating-point operations when a denormalized number is input.
Rev.1.00 Jan. 10, 2008 Page 130 of 1658
REJ09B0261-0100