Renesas M16C FAMILY Hardware Manual page 31

Under development
Preliminary specification
Specifications in this manual are tentative and subject to change.
R8C/11 Group
V o l t a g e d e t e c t i o n r e g i s t e r 1
b 7 b 6 b 5 b 4 b 3 b 2
0 0 0 0 0 0 0
N o t e s :
1 . T h e V C 1 3 b i t i s v a l i d w h e n t h e V C 2 7 b i t i n t h e V C R 2 r e g i s t e r i s s e t t o " 1 " ( v o l t a g e d e t e c t i o n c i r c u i t e n a b l e d ) . T h e
V C 1 3 b i t i s s e t t o " 1 " ( V
t o " 0 " ( v o l t a g e d e t e c t i o n c i r c u i t d i s a b l e d ) .
2 . S o f t w a r e r e s e t o r t h e w a t c h d o g t i m e r r e s e t d o e s n o t a f f e c t t h i s r e g i s t e r .
V o l t a g e d e t e c t i o n r e g i s t e r 2
b 7 b 6 b 5 b 4 b 3 b 2
0 0 0 0 0 0 0
N o t e s :
1 . S e t t h e P R C 3 b i t i n t h e P R C R r e g i s t e r t o " 1 " ( w r i t e e n a b l e d ) b e f o r e w r i t i n g t o t h i s r e g i s t e r .
2 . S e t t h e V C 2 7 b i t t o " 1 " ( v o l t a g e d e t e c t c i r c u i t e n a b l e d ) w h e n h a r d w a r e r e s e t 2 i s u s e d , o r t h e V C 1 3 b i t i n t h e
V C R 1 r e g i s t e r o r D 4 2 b i t i n t h e D 4 I N T r e g i s t e r i s u s e d , o r t h e D 4 0 b i t i s s e t t o " 1 " ( e n a b l e d ) .
3 . S o f t w a r e r e s e t o r t h e w a t c h d o g t i m e r r e s e t d o e s n o t a f f e c t t h i s r e g i s t e r .
Figure 5.8 VCR1 Register and VCR2 Register
Rev.0.91 2003 Sep 08
b 1 b 0
Symbol Address
VCR1 0019
Bit symbol
Reserved bit
( b 2 - b 0 )
V o l t a g e m o n i t o r f l a g
V C 1 3
Reserved bit
( b 7 - b 4 )
≥ V d e t o r v o l t a g e d e t e c t i o n c i r c u i t d i s a b l e d ) w h e n t h e V C 2 7 b i t i n t h e V C R 2 r e g i s t e r i s s e t
C C
1
b 1 b 0
Symbol Address
VCR2 001A
B i t s y m b o l
Reserved bit
(b6-b0)
Voltage monitor bit
VC27
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2
After reset
00
16 16
Bit name
S h o u l d se t t o " 0 "
0 : V
1 C C
1 : V
C C
d e t e c t i o n c i r c u i t d i s a b l e d
S h o u l d s e t t o " 0 "
3
After reset
10000000
16 2
Bit name
Should set to "0"
0: Voltage detection circuit
2
disabled
1: Voltage detection circuit
enabled
5.4 Voltage Detection Circuit
F u n c t i o n R W
R W
< V d e t
R O
≥
V d e t o r v o l t a g e
R W
R W
Function
RW
RW