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M38K09RFS Datasheet(PDF) 264 Page - Renesas Technology Corp |
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M38K09RFS Datasheet(HTML) 264 Page - Renesas Technology Corp |
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264 / 328 page  3.2 Notes on use Rev.2.00 Oct 05, 2006 page 23 of 89 38K0 Group REJ09B0337-0200 APPENDIX 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. 3.2.2 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. 3.2.4 Notes on timer q If a value n (between 0 and 255) is written to a timer latch, the frequency division ratio is 1/(n+1). q When switching the count source by the timer 12 and X count source selection bits, the value of timer count is altered in unconsiderable amount owing to generating of thin pulses in the count input signals. Therefore, select the timer count source before set the value to the prescaler and the timer. (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. |
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