R0K572030S000BE Renesas Electronics America, R0K572030S000BE Datasheet - Page 178

• Manufacturer Part Number: R0K572030S000BE
• Description: KIT DEV FOR SH7203
• Manufacturer: Renesas Electronics America
• Series: Renesas Starter Kits (RSK)r
• Type: MCUr

Specifications of R0K572030S000BE

• Contents: CPU Board, LCD Module, E10A-Lite Emulator, Cable, QuickStart Guide and CD-ROM
• Silicon Manufacturer: Renesas
• Kit Contents: Board
• Silicon Family Name: SH7203
• Silicon Core Number: R5S72030W200FP
• Tool / Board Applications: General Purpose MCU, MPU, DSP, DSC
• Mcu Supported Families: SH7203
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: SH7203
• Lead Free Status / Rohs Status: Compliant

Section 5 Exception Handling
5.9
5.9.1
The value of the stack pointer must always be a multiple of four. If it is not, an address error will
occur when the stack is accessed during exception handling.
5.9.2
The value of the vector base register must always be a multiple of four. If it is not, an address error
will occur when the stack is accessed during exception handling.
5.9.3
When the stack pointer is not a multiple of four, an address error will occur during stacking of the
exception handling (interrupts, etc.) and address error exception handling will start up as soon as
the first exception handling is ended. Address errors will then also occur in the stacking for this
address error exception handling. To ensure that address error exception handling does not go into
an endless loop, no address errors are accepted at that point. This allows program control to be
shifted to the address error exception service routine and enables error processing.
When an address error occurs during exception handling stacking, the stacking bus cycle (write) is
executed. During stacking of the status register (SR) and program counter (PC), the SP is
decremented by 4 for both, so the value of SP will not be a multiple of four after the stacking
either. The address value output during stacking is the SP value, so the address where the error
occurred is itself output. This means the write data stacked will be undefined.
Rev. 3.00 Sep. 28, 2009 Page 146 of 1650
REJ09B0313-0300
Usage Notes
Value of Stack Pointer (SP)
Value of Vector Base Register (VBR)
Address Errors Caused by Stacking of Address Error Exception Handling