Renesas M16C Series User Manual page 230

M30245 Group
S e l e c t i n g S a m p l e a n d h o l d
b 7
0
S e t t i n g A D c o n t r o l r e g i s t e r 0 a n d A D c o n t r o l r e g i s t e r 1
b 7
0
www.DataSheet4U.com
N o t e 1 : R e w r i t e t o a n a l o g i n p u t p i n s e l e c t b i t a f t e r c h a n g i n g A / D o p e r a t i o n m o d e .
N o t e 2 : W h e n f ( X
S e t t i n g A / D c o n v e r s i o n s t a r t f l a g
b 7
1
Reading conversion result
( b 1 5 )
b7
Setting A/D conversion start flag
b 7
0
Figure 2.9.7. Set-up procedure of one-shot mode, with an external trigger selected
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
b 0
A D c o n t r o l r e g i s t e r 2 [ A d d r e s s 0 3 D 4
0 0
1
A D C O N 2
A / D c o n v e r s i o n m e t h o d s e l e c t b i t
1 : W i t h s a m p l e a n d h o l d
M u s t a l w a y s b e s e t t o " 0 "
b 0
AD control register 0 [Address 03D6
1 0 0
ADCON0
A n a l o g i n p u t p i n s e l e c t b i t ( N o t e 1 )
b2 b1 b0
0 0 0 : A N i s s e l e c t e d
0
0 0 1 : A N i s s e l e c t e d
1
0 1 0 : A N i s s e l e c t e d
2
0 1 1 : A N i s s e l e c t e d
3
1 0 0 : A N i s s e l e c t e d
4
1 0 1 : A N i s s e l e c t e d
5
1 1 0 : A N i s s e l e c t e d
6
1 1 1 : A N i s s e l e c t e d
7
One-shot mode is selected (Note 1)
Trigger select bit
1 : AD trigger
TRG
A / D c o n v e r s i o n s t a r t f l a g
0 : A / D c o n v e r s i o n d i s a b l e d
Frequency select bit 0 (Note 2)
0 : f /3 or f /4 is selected
AD AD
1 : f or f /2 is selected
AD AD
) i s o v e r 1 0 M H z , t h e f f r e q u e n c y m u s t b e u n d e r 1 0 M H z b y d i v i d i n g a n d s e t ø
I N A D
b 0
AD control register 0 [Address 03D6
ADCON0
A/D conversion start flag
1 : A/D conversion started
When AD
( b 8 )
b0 b7
b 0
AD control register 0 [Address 03D6
ADCON0
A/D conversion start flag
0 : A/D conversion disabled
page 221 of 354
]
1 6
b 7
]
16
0 0 1 0
]
16
pin level becomes from "H" to "L"
TRG
Start A/D conversion
AD register 0 [Address 03C1 , 03C0
16
AD register 1 [Address 03C3 , 03C2
16
AD register 2 [Address 03C5 , 03C4
16
b0
AD register 3 [Address 03C7 , 03C6
16
AD register 4 [Address 03C9 , 03C8
16
AD register 5 [Address 03CB , 03CA
16
AD register 6 [Address 03CD
16
AD register 7 [Address 03CF , 03CE
16
E i g h t l o w - o r d e r b i t s o f A / D c o n v e r s i o n r e s u l t
During 10-bit mode
Two high-order bits of A/D conversion result
During 8-bit mode
When read, the content is indeterminate
]
16
S t o p A / D c o n v e r s i o n
2. A/D Converter
b0
AD control register 1 [Address 03D7
ADCON1
I n v a l i d i n o n e - s h o t m o d e
A / D o p e r a t i o n m o d e s e l e c t b i t 1 ( N o t e 1 )
0 ( M u s t a l w a y s b e " 0 " i n o n e - s h o t m o d e )
8 / 1 0 - b i t m o d e s e l e c t b i t
0 : 8 - b i t m o d e
1 : 1 0 - b i t m o d e
F r e q u e n c y s e l e c t b i t 1 ( N o t e 2 )
0 : f / 2 o r f / 4 i s s e l e c t e d
A D A D
1 : f o r f / 3 i s s e l e c t e d
A D A D
V r e f c o n n e c t b i t
1 : V r e f c o n n e c t e d
Reserved bit
f r e q u e n c y t o 1 0 M H z o r l o w e r .
A D
] AD0
16
] AD1
16
] AD2
16
] AD3
16
] AD4
16
] AD5
16
, 03CC ] AD6
16
] AD7
16
]
16