R8A77800ANBGAV Renesas Electronics America, R8A77800ANBGAV Datasheet - Page 1272

• Manufacturer Part Number: R8A77800ANBGAV
• Description: IC SUPERH MPU ROMLESS 449-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

Specifications of R8A77800ANBGAV

• Core Processor: SH-4A
• Core Size: 32-Bit
• Speed: 400MHz
• Connectivity: Audio Codec, MMC, Serial Sound, SCI, SIO, SPI, SSI
• Peripherals: DMA, POR, WDT
• Number Of I /o: 75
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.15 V ~ 1.35 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 449-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

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 Prefetch Side Effects:.
Usage Condition: When the speculative execution for subroutine return is enabled, the RTS
Rev.1.00 Dec. 13, 2005 Page 1220 of 1286
REJ09B0158-0100
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.