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M38K09RFS Datasheet(PDF) 151 Page - Renesas Technology Corp |
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M38K09RFS Datasheet(HTML) 151 Page - Renesas Technology Corp |
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151 / 328 page  2.2 Interrupt Rev.2.00 Oct 05, 2006 page 22 of 111 38K0 Group REJ09B0337-0200 APPLICATION (2) Check of interrupt request bit q When executing the BBC or BBS instruction to an interrupt request bit of an interrupt request register immediately after this bit is set to “0” by using a data transfer instruction, execute one or more instructions before executing the BBC or BBS instruction. Clear the interrupt request bit to “0” (no interrupt issued) ↓ NOP (one or more instructions) ↓ Execute the BBC or BBS instruction Data transfer instruction: LDM, LDA, STA, STX, and STY instructions Fig. 2.2.16 Sequence of check of interrupt request bit s Reason If the BBC or BBS instruction is executed immediately after an interrupt request bit of an interrupt request register is cleared to “0”, the value of the interrupt request bit before being cleared to “0” is read. |
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