HD6417750SF200V Renesas Electronics America, HD6417750SF200V Datasheet - Page 292

• Manufacturer Part Number: HD6417750SF200V
• Description: MPU 3V 16K PB-FREE 208-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7750r

Specifications of HD6417750SF200V

• Core Processor: SH-4
• Core Size: 32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 28
• Program Memory Type: ROMless
• Ram Size: 24K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 2.07 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 208-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Section 6 Floating-Point Unit (FPU)
Modifying Software
Problem types (1), (2), and (3): Deal with problem types (1), (2), and (3) in table 6.3 using
software based on the flowchart below.
1536
Adjust the source operands by multiplying them by 2
, then calculate them as normalized
numbers.
In the case of problem type (1), if the Divide by Zero exception is enabled, the divide by zero
exception trap is generated and the destination register does not change. If the Divide by Zero
exception is disabled, the contents of the destination register become infinity with the sign based
on the input operands.
START
Save source DRn
FDIV DRm, DRn
Yes
Is operation result
±INF or ±0?
No
Yes
Problem type (1), (2),
or (3)?
Restore source DRn
No
DRm × 2
, DRn × 2
1536
1536
FDIV DRm, DRn
END
Problem type (7): In the case of problem type (7) in table 6.3, no FPU error occurs. The operation
result is correct and there is no need for a software workaround.
Rev.7.00 Oct. 10, 2008 Page 206 of 1074
REJ09B0366-0700