R5F21133DFP RENESAS [Renesas Technology Corp], R5F21133DFP Datasheet - Page 200

• Manufacturer Part Number: R5F21133DFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY/R8C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

R8C/13 Group
Rev.1.20
REJ09B0111-0120
Figure 19.1 Example of Procedure for Changing Interrupt Factor
19.2.5 Changing Interrupt Factor
The IR bit in the interrupt control register may be set to “1” (interrupt requested) when the interrupt
factor is changed. When using an interrupt, set the IR bit to “0” (interrupt not request) after changing
the interrupt factor. In addition, the changes of interrupt factors include all elements that change the
interrupt factors assigned to individual software interrupt numbers, polarities, and timing. Therefore,
when a mode change of the peripheral functions involves interrupt factors, edge polarities, and timing,
set the IR bit to “0” (interrupt not requested) after the change. Refer to each peripheral function for the
interrupts caused by the peripheral functions.
Figure 19.1 shows an Example of Procedure for Changing Interrupt Factor.
Jan 27, 2006
N O T E S :
• I R b i t : T h e i n t e r r u p t c o n t r o l r e g i s t e r b i t o f a n i n t e r r u p t w h o s e
1 . E x e c u t e t h e a b o v e s e t t i n g i n d i v i d u a l l y . D o n o t e x e c u t e t w o
2 . U s e t h e I f l a g f o r t h e I N T i ( i = 0 t o 3 ) i n t e r r u p t .
3 . R e f e r t o “ 1 9 . 2 . 6 C h a n g i n g I n t e r r u p t C o n t r o l R e g i s t e r ” f o r t h e
page 189 of 205
o f t h e i n t e r r u p t w h o s e f a c t o r i s c h a n g e d .
o r m o r e s e t t i n g s a t o n c e ( b y o n e i n s t r u c t i o n ) .
T o p r e v e n t i n t e r r u p t r e q u e s t s f r o m b e i n g g e n e r a t e d w h e n
u s i n g p e r i p h e r a l f u n c t i o n i n t e r r u p t s o t h e r t h a n t h e I N T i
i n t e r r u p t f a c t o r . I n t h i s c a s e , u s e t h e I f l a g w h e n a l l
m a s k a b l e i n t e r r u p t s c a n b e d i s a b l e d . W h e n a l l m a s k a b l e
i n t e r r u p t s c a n n o t b e d i s a b l e d , u s e t h e I L V L 0 t o I L V L 2 b i t s
i n s t r u c t i o n s t o b e u s e d a n d t h e i r u s a g e n o t e s .
S e t I R b i t t o “ 0 ” ( i n t e r r u p t n o t r e q u e s t e d ) u s i n g
f a c t o r i s c h a n g e d
C h a n g e i n t e r r u p t f a c t o r ( i n c l u d i n g m o d e o f
I n t e r r u p t f a c t o r c h a n g e
p e r i p h e r a l f u n c t i o n s )
D i s a b l e I n t e r r u p t
E n a b l e i n t e r r u p t
Change completed
M O V i n s t r u c t i o n
(2 , 3 )
(2 , 3 )
(3 )
19. Usage Notes