HD64F7044F28V Renesas Electronics America, HD64F7044F28V Datasheet - Page 97

• Manufacturer Part Number: HD64F7044F28V
• Description: IC SUPERH MCU FLASH 112QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7040r

Specifications of HD64F7044F28V

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 28.7MHz
• Connectivity: EBI/EMI, SCI
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 112-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

4.17
Data contention occurs when the same register is specified as the destination operand for two or
more parallel processing instructions. It occurs in three cases.
1. When the same destination operand is specified for an ALU operation and multiplication (Du,
2. When the same destination operand is specified for an X memory load and an ALU operation
3. When the same destination operand is specified for a Y memory load and an ALU operation
Results cannot be guaranteed when contention occurs. Table 4.32 shows the operand and register
combinations that cause contention.
Some assemblers can detect these types of contention, so pay attention to assembler functions
when selecting one.
MOVX,
MOVX
MOVX
Dg)
(Dx, Du, Dz)
(Dx, Du, Dz)
ADD
Slot
Figure 4.22 Example of the Execution of Operation and Data Store Instructions
PADD X0, Y0, A0
Operand Contention
IF
1
MOVX.W A0, @R4+
MOVX.W @R5, X1
MOVX.W A0, @R4+
ID
IF
2
dressing)
EX (ad-
IF
ID
3
dressing)
EX (ad-
MOVX
ID
4
Rev. 5.00 Jun 30, 2004 page 81 of 512
Insert an unrelated step
between data operation
instruction and store instruction.
dressing)
EX (ad-
MOVX
ADD
Section 4 Instruction Features
5
MOVX
DSP
REJ09B0171-0500O
6
DSP (nop)
7