HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 74
HD6417021
Manufacturer Part Number
HD6417021
Description
SuperH RISC engine
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6417021.pdf
(507 pages)
- Current page: 74 of 507
- Download datasheet (2Mb)
4.5.3
An instruction located immediately after a delayed branch instruction is called an “instruction
placed in a delay slot.” If an undefined instruction is located in a delay slot, illegal slot instruction
exception processing begins executing when the undefined code is decoded. Illegal slot instruction
exception processing also begins when the instruction located in the delay slot is an instruction
that rewrites the program counter. In this case, exception processing begins when the instruction
that rewrites the PC is decoded. The CPU performs illegal slot exception processing as follows:
1. Saves the status register onto the stack.
2. Pushes the program counter value onto the stack. The PC value saved is the branch destination
3. Fetches an exception processing service routine start address from the vector table
4.5.4
If an undefined instruction located other than a delay slot (immediately after a delayed branch
instruction) is decoded, general illegal instruction exception processing is executed. The CPU
follows the same procedure as for illegal slot exception processing, except that the program
counter (PC) value pushed on the stack in general illegal instruction exception processing is the
top address of the illegal instruction with the undefined code.
56 HITACHI
address of the delayed branch instruction immediately before the instruction that contains the
undefined code or rewrites the PC.
corresponding to the exception that occurred, branches to that address and the program starts
executing. The branch is not a delayed branch.
Illegal Slot Instruction
General Illegal Instructions
Related parts for HD6417021
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
HM628128LFP-10Hitachi Semiconductor [131072-word x 8-bit High Speed CMOS Static RAM]
Manufacturer:
HITACHI
Datasheet:
Part Number:
Description:
Silicon N-Channel Junction FET
Manufacturer:
Hitachi Semiconductor
Datasheet:
Part Number:
Description:
Silicon N-Channel MOS FET
Manufacturer:
Hitachi Semiconductor
Datasheet:
Part Number:
Description:
Silicon N-Channel MOS FET
Manufacturer:
Hitachi Semiconductor
Datasheet:
Part Number:
Description:
Silicon N-Channel MOS FET
Manufacturer:
Hitachi Semiconductor
Datasheet:
Part Number:
Description:
Silicon N-Channel MOS FET
Manufacturer:
Hitachi Semiconductor
Datasheet:
Part Number:
Description:
Silicon N-Channel Junction FET
Manufacturer:
Hitachi Semiconductor
Datasheet:
Part Number:
Description:
Silicon N-Channel MOS FET
Manufacturer:
Hitachi Semiconductor
Datasheet:
Part Number:
Description:
Silicon N-Channel MOS FET
Manufacturer:
Hitachi Semiconductor
Datasheet:
Part Number:
Description:
GaAs HEMT
Manufacturer:
Hitachi Semiconductor
Datasheet:
Part Number:
Description:
Silicon N Channel MOS FET High Speed Power Switching
Manufacturer:
Hitachi Semiconductor
Datasheet:
Part Number:
Description:
Silicon N Channel MOS FET High Speed Power Switching
Manufacturer:
Hitachi Semiconductor
Datasheet:
Part Number:
Description:
Silicon N Channel MOS FET Low Frequency Power Switching
Manufacturer:
Hitachi Semiconductor
Datasheet:
Part Number:
Description:
Silicon N Channel MOS FET High Speed Switching
Manufacturer:
Hitachi Semiconductor
Datasheet:
Part Number:
Description:
Silicon N Channel MOS FET High Speed Switching
Manufacturer:
Hitachi Semiconductor
Datasheet: