R5S77631Y266BGV Renesas Electronics America, R5S77631Y266BGV Datasheet - Page 1978

• Manufacturer Part Number: R5S77631Y266BGV
• Description: IC SUPERH MPU ROMLESS 499BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

Specifications of R5S77631Y266BGV

• Core Processor: SH-4A
• Core Size: 32-Bit
• Speed: 266MHz
• Connectivity: Audio Codec, I²C, MMC, SCI, SIM, SIO, SSI, USB
• Peripherals: DMA, LCD, POR, WDT
• Number Of I /o: 107
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.15 V ~ 1.35 V
• Data Converters: A/D 4x10b; D/A 2x8b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 499-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

Appendix
C.
The SH-4A has the mechanism to issue an instruction fetch speculatively when returning from
subroutine. By issueing an instruction fetch speculatively, the execution cycles to return from
subroutine may be shortened.
This function is enabled by setting 0 to the bit 5 (RABD) of CPU Operation Mode register
(CPUOPM). But this speculative instruction fetch may issue the access to the address that should
not be accessed from the program. Therefore a bus access to an unexpected area or an internal
instruction address error may cause a problem. As for the effect of this bus access to unexpected
memory area, refer to appendix B, Instruction Prefetching and Its Side Effects.
Usage Condition: When the speculative execution for subroutine return is enabled, the RTS
Rev. 2.00 May 22, 2009 Page 1908 of 1982
REJ09B0256-0200
Speculative Execution for Subroutine Return
instruction should be used to return to the address set in PR by the JSR, BSR
or BSRF instructions. It can prevent the access to unexpected address and
avoid the problem.