HD6417034AFI20V Renesas Electronics America, HD6417034AFI20V Datasheet - Page 93

• Manufacturer Part Number: HD6417034AFI20V
• Description: MCU 5V 0K I-TEMP PB-FREE 112-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7030r

Specifications of HD6417034AFI20V

• Core Processor: SH-1
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: EBI/EMI, SCI
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Type: ROMless
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 112-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

4.8
4.8.1
An address error occurs if the stack is accessed for exception handling when the value of the stack
pointer (SP) is not a multiple of four. Therefore, a multiple of four should always be stored in the
SP.
4.8.2
An address error occurs if the vector table is accessed for exception handling when the value of
the vector base register (VBR) is not a multiple of four. Therefore, VBR should always be set to a
multiple of four.
4.8.3
If the stack pointer is not a multiple of four, address errors will occur in the exception handling
(interrupt, etc.) stacking. After the exception handling ends, the CPU will then shift to address
error exception handling. An address error will also occur during the address error exception
handling stacking, but the CPU is set up to ignore the address error so that it can avoid an infinite
series of address errors. This allows it to shift program control to the address error exception
handling routine and handle the error.
When an address error does occur in exception handling stacking, the stacking bus cycle (write) is
executed. In SR and PC stacking, four is subtracted from each of the SPs so the SP values are not
multiples of four after stacking either. Since the address value output during stacking is the SP
value, the address that produced the error is exactly what is output. In such cases, the stacked write
data will be undefined.
Notes
Value of the Stack Pointer (SP)
Value of the Vector Base Register (VBR)
Address Errors Caused by Stacking During Address Error Exception Handling
Rev. 7.00 Jan 31, 2006 page 65 of 658
Section 4 Exception Handling
REJ09B0272-0700