DF71251AD50FPV Renesas Electronics America, DF71251AD50FPV Datasheet - Page 94

• Manufacturer Part Number: DF71251AD50FPV
• Description: MCU RISC FLASH 32K 8K 64LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH Tinyr

Specifications of DF71251AD50FPV

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 37
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

5.1.2
The exceptions are detected and the exception handling starts according to the timing shown in
table 5.2.
Table 5.2
When exception handling starts, the CPU operates
Exception Handling Triggered by Reset: The initial values of the program counter (PC) and
stack pointer (SP) are fetched from the exception handling vector table (PC from the address
H'00000000 and SP from the address H'00000004 when a power-on reset. PC from the address
H'00000008 and SP from the address H'0000000C when a manual reset.). For details, see section
5.1.3, Exception Handling Vector Table. H'00000000 is then written to the vector base register
(VBR), and H'F (B'1111) is written to the interrupt mask bits (I3 to I0) in the status register (SR).
The program starts from the PC address fetched from the exception handling vector table.
Exception Handling Triggered by Address Error, Interrupt, and Instruction: SR and PC are
saved to the stack indicated by R15. For interrupt exception handling, the interrupt priority level is
written to the interrupt mask bits (I3 to I0) in SR. For address error and instruction exception
handling, bits I3 to I0 are not affected. The start address is then fetched from the exception
handling vector table and the program starts from that address.
Rev. 5.00 Mar. 06, 2009 Page 74 of 770
REJ09B0243-0500
Exception
Reset
Address error
Interrupt
Instruction
Exception Handling Operations
Timing for Exception Detection and Start of Exception Handling
Power-on reset
Manual reset
Trap instruction Started by the execution of the TRAPA instruction.
General illegal
instructions
Illegal slot
instructions
Timing of Source Detection and Start of Exception Handling
Started when the RES pin changes from low to high or when the
WDT overflows.
Started when the MRES pin changes from low to high or when the
WDT overflows.
Detected during the instruction decode stage and started after the
execution of the current instruction is completed.
Started when an undefined code placed at other than a delay slot
(immediately after a delayed branch instruction) is decoded.
Started when an undefined code placed at a delay slot
(immediately after a delayed branch instruction) or an instruction
that changes the PC value is detected.