HD6417751RF240V Renesas Electronics America, HD6417751RF240V Datasheet - Page 201

• Manufacturer Part Number: HD6417751RF240V
• Description: MPU 1.5/3.3V 0K PB-FREE 256-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7750r

Specifications of HD6417751RF240V

• Core Processor: SH-4
• Core Size: 32-Bit
• Speed: 240MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 39
• Program Memory Type: ROMless
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 256-QFP Exposed Pad, 256-eQFP, 256-HQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

4.1
4.1.1
The SH7751 has an on-chip 8-Kbyte instruction cache (IC) for instructions and 16-Kbyte operand
cache (OC) for data. Half of the memory of the operand cache (8 Kbytes) can also be used as on-
chip RAM. The features of these caches are summarized in table 4.1.
The SH7751 has an on-chip 16-Kbyte instruction cache (IC) for instructions and 32-Kbyte
operand cache (OC) for data. Half of the operand cache memory (16 Kbytes) can also be used as
on-chip RAM. When the EMODE bit in the CCR register is cleared to 0 in the SH7751R, both the
IC and OC are set to SH7751 compatible mode. When the EMODE bit in the CCR register is set
to 1, the cache characteristics are as shown in table 4.2. After a power-on reset or manual reset, the
initial value of the EMODE bit is 0.
This LSI supports two 32-byte store queues (SQs) for performing high-speed writes to external
memory. SQ features are shown in table 4.3.
Table 4.1
Item
Capacity
Type
Line size
Entries
Write method
Overview
Features
Cache Features (SH7751)
Instruction Cache
8-Kbyte cache
Direct mapping
32 bytes
256 entry
Section 4 Caches
Rev.4.00 Oct. 10, 2008 Page 101 of 1122
Operand Cache
16-Kbyte cache or 8-Kbyte cache +
8-Kbyte RAM
Direct mapping
32 bytes
512 entry
Copy-back/write-through selectable
REJ09B0370-0400
4. Caches