hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 135

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

• If the interrupt request is accepted, after processing of the current instruction is completed,
• The I bit of CCR is set to 1, masking further interrupts.
• The vector address corresponding to the accepted interrupt is generated, and the interrupt
Notes: 1. When disabling interrupts by clearing bits in an interrupt enable register, or when
both PC and CCR are pushed onto the stack. The state of the stack at this time is shown in
figure 3.4. The PC value pushed onto the stack is the address of the first instruction to be
executed upon return from interrupt handling.
handling routine located at the address indicated by the contents of the vector address is
executed.
2. If the above clear operations are performed while I = 0, and as a result a conflict arises
clearing bits in an interrupt request register, always do so while interrupts are masked
(I = 1).
between the clear instruction and an interrupt request, exception processing for the
interrupt will be executed after the clear instruction has been executed.
Rev. 7.00 Mar 10, 2005 page 93 of 652
Section 3 Exception Handling
REJ09B0042-0700