HD643303x Hitachi, HD643303x Datasheet - Page 86

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

4.4 Trap Instruction
Trap instruction exception handling starts when a TRAPA instruction is executed. If the UE bit is
set to 1 in the system control register (SYSCR), the exception handling sequence sets the I bit to 1
in CCR. If the UE bit is 0, the I and UI bits are both set to 1. The TRAPA instruction fetches a
start address from a vector table entry corresponding to a vector number from 0 to 3, which is
specified in the instruction code.
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