HD6417727F100C Renesas Electronics America, HD6417727F100C Datasheet - Page 187

• Manufacturer Part Number: HD6417727F100C
• Description: IC SUPERH MPU ROMLESS 240QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417727F100C

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 100MHz
• Connectivity: FIFO, SCI, SIO, SmartCard, USB
• Peripherals: DMA, LCD, POR, WDT
• Number Of I /o: 104
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.6 V ~ 2.05 V
• Data Converters: A/D 6x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 240-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -

Measures to avoid the problem
The following two measures should be taken to avoid the problem described above:
a. After performing a reset and before setting AT to 1 in MMUCR, initialize to 1 the upper
b. When invalidating an entry in the TLB address array, initialize to 1 the upper four bits of
The above measures will ensure that the VPN is not in the area referenced after address
conversion. This will prevent condition (3) from being satisfied and prevent the problem
described above from arising.
four bits of the VPNs for each entry in the TLB address array.
the corresponding VPN in addition to setting V to 0.
Section 3 Memory Management Unit (MMU)
Rev.6.00 Mar. 27, 2009 Page 129 of 1036
REJ09B0254-0600