HD6417720BP133BV Renesas Electronics America, HD6417720BP133BV Datasheet - Page 204

• Manufacturer Part Number: HD6417720BP133BV
• Description: SH3-DSP, WITH USB AND LCDC, PB-F
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417720BP133BV

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 133MHz
• Connectivity: FIFO, I²C, IrDA, MMC, SCI, SD, SIO, SIM, USB
• Peripherals: DMA, LCD, POR, WDT
• Number Of I /o: 117
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Data Converters: A/D 4x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

Section 3 DSP Operating Unit
Table 3.29 Variation of PDMSB Operation
The N bit always indicates the same state as the DC bit set in negative value mode by the CS[2:0]
bits. See the negative value mode part above. The Z bit always indicates the same state as the DC
bit set in zero value mode by the CS[2:0] bits. See the zero value mode part above. The V bit is
always cleared. The GT bit always indicates the same state as the DC bit set in signed greater than
mode by the CS[2:0] bits. See the signed greater than mode part above.
3.5.10
The DSP unit provides the function that rounds from 32 bits to 16 bits. In case of providing guard-
bit parts, it rounds from 40 bits to 24 bits. When a round instruction is executed, H'00008000 is
added to the source operand data and then, the lower word is cleared. Figure 3.20 shows the
rounding operation flow and figure 3.21 shows the operation definition. Table 3.30 shows the
variation of this type of operation. The correspondence between each operand and registers is the
same as ALU fixed-point operations as shown in table 3.21.
As shown in figure 3.21, the rounding operation uses full-size data for both source and destination
operands. These operations are executed in the DSP stage as shown in figure 3.10. The DSP stage
is the same stage as the MA stage in which memory access is performed.
The rounding operation is always executed unconditionally, so that the DC, N, Z, V, and GT bits
in DSR are always updated in accordance with the operation result. The definition of the DC bit is
selected by the CS0 to CS2 (condition selection) bits in DSR. The result of these condition code
bits is the same as the ALU-fixed point arithmetic operations.
Page 144 of 1414
Mnemonic
PDMSB
Rounding Operation
Function
MSB detection
Source
Sx
⎯
Source 2
⎯
Sy
SH7720 Group, SH7721 Group
R01UH0083EJ0400 Rev. 4.00
Destination
Dz
Dz
Sep 21, 2010