HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 84

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 4 Exception Handling
4.3
4.3.1
Address errors occur during instruction fetches and data reading/writing as shown in table 4.5.
Table 4.5
Type
Instruction fetch
Data read/write
Note: * See section 8, Bus State Controller (BSC), for details on the on-chip supporting module
4.3.2
When an address error occurs, address error exception handling starts after both the bus cycle that
caused the address error and the instructions that were being executed at that time, have been
completed. The CPU then:
1. Pushes SR onto the stack.
2. Pushes the program counter onto the stack. The PC value saved is the start address of the
3.
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instruction following the last instruction to be executed.
Fetches the exception handling routine start address from the exception vector table for the
address error that occurred and starts program execution from that address. The branch that
occurs here is not a delayed branch.
space.
Address Errors
Address Error Sources
Address Error Exception Handling
Bus Cycle
Address Error Sources
Bus Master
CPU
CPU or DMAC
Operation
Instruction fetch from even address
Instruction fetch from odd address
Instruction fetch from outside on-chip
supporting module space
Instruction fetch from on-chip supporting
module space
Access to word data from even address
Access to word data from odd address
Access to longword data aligned on
longword boundary
Access to longword data not aligned on
longword boundary
Access to word or byte data in on-chip
supporting module space*
Access to longword data in 16-bit on-
chip supporting module space*
Access to longword data in 8-bit on-chip
supporting module space*
Address Error
None (normal)
Address error
None (normal)
Address error
None (normal)
Address error
None (normal)
Address error
None (normal)
None (normal)
Address error