R5F21133DFP RENESAS [Renesas Technology Corp], R5F21133DFP Datasheet - Page 185

• 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 17.8 Process to Reduce Power Consumption in On-Chip Oscillator Mode (Main Clock Stops)
N O T E S :
1 . S e t t h e F M R 0 1 b i t t o “ 1 ” ( C P U r e w r i t e m o d e ) b e f o r e s e t t i n g t h e F M S T P b i t t o “ 1 ” .
2 . B e f o r e t h e c l o c k s o u r c e f o r C P U c l o c k c a n b e c h a n g e d , t h e c l o c k t o w h i c h t o b e c h a n g e d m u s t b e s t a b l e .
3 . I n s e r t a 1 5 µ s w a i t t i m e i n a p r o g r a m . A v o i d a c c e s s i n g t o t h e f l a s h m e m o r y d u r i n g t h i s w a i t t i m e .
4 . E n s u r e 1 0 µ s u n t i l s e t t i n g “ 0 ” ( f l a s h m e m o r y o p e r a t e s ) a f t e r s e t t i n g t h e F M S T P b i t t o “ 1 ” ( f l a s h m e m o r y s t o p s ) .
J u m p t o t h e o n - c h i p o s c i l l a t o r m o d e ( m a i n c l o c k
s t o p ) p r o g r a m w h i c h h a s b e e n t r a n s f e r r e d t o a n y
a r e a o t h e r t h e f l a s h m e m o r y .
( T h e s u b s e q u e n t p r o c e s s i n g i s e x e c u t e d b y a
p r o g r a m i n a n y a r e a o t h e r t h a n t h e f l a s h m e m o r y . )
s t o p ) p r o g r a m t o a n y a r e a o t h e r t h e f l a s h m e m o r y
Jan 27, 2006
T r a n s f e r a o n - c h i p o s c i l l a t o r m o d e ( m a i n c l o c k
page 174 of 205
( m a i n c l o c k s t o p ) p r o g r a m
O n - c h i p o s c i l l a t o r m o d e
S e t t h e F M S T P b i t t o “ 0 ” ( f l a s h m e m o r y o p e r a t i o n )
S e t F M S T P b i t t o “ 1 ”
( f l a s h m e m o r y s t o p p e d . L o w p o w e r s t a t e )
T u r n m a i n c l o c k o n
J u m p t o a s p e c i f i e d a d d r e s s i n t h e f l a s h m e m o r y
S e t t h e F M R 0 1 b i t b y w r i t i n g “ 0 ” a n d t h e n “ 1 ”
( C P U r e w r i t e m o d e e n a b l e d )
s w i t c h t h e c l o c k s o u r c e f o r C P U c l o c k
S w i t c h t h e c l o c k s o u r c e f o r C P U c l o c k .
T u r n X
P r o c e s s o f o n - c h i p o s c i l l a t o r m o d e ( m a i n
c l o c k s t o p )
W a i t u n t i l t h e f l a s h m e m o r y c i r c u i t s t a b i l i z e s
( 1 5 s )
I N
(3 )
( C P U r e w r i t e m o d e d i s a b l e d )
o f f
W r i t e “ 0 ” t o t h e F M R 0 1 b i t
w a i t u n t i l o s c i l l a t i o n s t a b i l i z e s
17.4 CPU Rewrite Mode
(2 )
(1 )
(4 )