HD6417750RF240DV Renesas Electronics America, HD6417750RF240DV Datasheet - Page 281

• Manufacturer Part Number: HD6417750RF240DV
• Description: MPU 3V 16K I-TEMP,PB-FREE 208-QF
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7750r

Specifications of HD6417750RF240DV

• Core Processor: SH-4
• Core Size: 32-Bit
• Speed: 240MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 28
• Program Memory Type: ROMless
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 208-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

6.6
The FPU supports two kinds of graphics functions: new instructions for geometric operations, and
pair single-precision transfer instructions that enable high-speed data transfer.
6.6.1
Geometric operation instructions perform approximate-value computations. To enable high-speed
computation with a minimum of hardware, the FPU ignores comparatively small values in the
partial computation results of four multiplications. Consequently, the error shown below is
produced in the result of the computation:
Maximum error = MAX (individual multiplication result ×
The number of significant digits is 24 for a normalized number and 23 for a denormalized number
(number of leading zeros in the fractional part).
In future version of SuperH RISC engine family, the above error is guaranteed, but the same result
as SH7750 is not guaranteed.
FIPR FVm, FVn (m, n: 0, 4, 8, 12): This instruction is basically used for the following purposes:
• Inner product (m ≠ n):
• Sum of square of elements (m = n):
⎯ Overflow (O):
⎯ Underflow (U):
⎯ Inexact exception (I): An inexact result is generated.
This operation is generally used for surface/rear surface determination for polygon surfaces.
This operation is generally used to find the length of a vector.
When rounding mode = RZ, the maximum normalized number, with the same sign as the
unrounded value, is generated.
When rounding mode = RN, infinity with the same sign as the unrounded value is
generated.
When FPSCR.DN = 0, a denormalized number with the same sign as the unrounded value,
or zero with the same sign as the unrounded value, is generated.
When FPSCR.DN = 1, zero with the same sign as the unrounded value, is generated.
Graphics Support Functions
Geometric Operation Instructions
2
–MIN (number of multiplier significant digits–1, number of multiplicand significant digits–1)
Rev.7.00 Oct. 10, 2008 Page 195 of 1074
Section 6 Floating-Point Unit (FPU)
) + MAX (result value × 2
REJ09B0366-0700
–23
, 2
–149
)