R8A77850BDBGV#RD0Z Renesas Electronics America, R8A77850BDBGV#RD0Z Datasheet - Page 168

• Manufacturer Part Number: R8A77850BDBGV#RD0Z
• Description: IC SUPERH MPU ROMLESS 436BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

Specifications of R8A77850BDBGV#RD0Z

• Core Processor: SH-4A
• Core Size: 32-Bit
• Speed: 600MHz
• Connectivity: Audio Codec, MMC, Serial Sound, SCI, SIO, SPI, SSI
• Peripherals: DMA, POR, WDT
• Number Of I /o: 108
• Program Memory Type: ROMless
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 1 V ~ 1.2 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 436-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

6. Floating-Point Unit (FPU)
Table 6.3
6.3.3
Information is transferred between the FPU and CPU via FPUL. FPUL is a 32-bit system register
that is accessed from the CPU side by means of LDS and STS instructions. For example, to
convert the integer stored in general register R1 to a single-precision floating-point number, the
processing flow is as follows:
Rev.1.00 Jan. 10, 2008 Page 136 of 1658
REJ09B0261-0100
Cause
Enable
Flag
R1 → (LDS instruction) → FPUL → (single-precision FLOAT instruction) → FR1
Field Name
FPU exception
cause field
FPU exception
enable field
FPU exception
flag field
Floating-Point Communication Register (FPUL)
Bit Allocation for FPU Exception Handling
FPU
Error (E)
Bit 17
None
None
Invalid
Operation (V)
Bit 16
Bit 11
Bit 6
Bit 15
Division
by Zero (Z)
Bit 10
Bit 5
Overflow
(O)
Bit 14
Bit 9
Bit 4
Underflo
w (U)
Bit 13
Bit 8
Bit 3
Inexact
(I)
Bit 12
Bit 7
Bit 2