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M38K09RFS bảng dữ liệu(PDF) 264 Page - Renesas Technology Corp

tên linh kiện M38K09RFS
Giải thích chi tiết về linh kiện  RENESAS 8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES
PDF  328 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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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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