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H8/3021 Datasheet(PDF) 130 Page - Renesas Technology Corp

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 130 Page - Renesas Technology Corp

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5. Interrupt Controller
Rev.2.00 Mar. 22, 2007 Page 106 of 684
REJ09B0352-0200
Method 1
When clearing the IRQaF flag, read ISR as a byte unit instead of using a bit-manipulation
instruction, and write a byte value that clears the IRQaF flag to 0 and sets the other bits to 1.
Example: When a = 0
MOV.B @ISR, R0L
MOV.B #HFE, R0L
MOV.B R0L, @ISR
Method 2
Perform dummy processing within the IRQb interrupt exception handling routine to clear the
IRQbF flag.
Example: When b = 1
IRQB
MOV.B #HFD, R0L
MOV.B R0L, @ISR
.
.
.



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