M306H7MG-XXXFP Datasheet, PDF (166/329 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

M306H7MG-XXXFP/MC-XXXFP/FGFP
12. A/D CONVERTER
A/D control register 2 (Note 1)
b7 b6 b5 b4 b3 b2 b1 b0
01 0
Symbol
ADCON2
Address
03D416
After reset
0016
Bit symbol
Bit name
Function
RW
SMP
A/D conversion method
select bit
0 : Without sample and hold
1 : With sample and hold
RW
(b1)
Reserved bit
Must always be set to "0"
RW
(b2)
(b3)
CKS2
(b7-b5)
Reserved bit
Must always be set to "1"
RW
Reserved bit
Must always be set to "0"
RW
Frequency select bit 2
(Note 2)
0: Selects fAD, fAD divided by 2, or fAD
divided by 4.
RW
1: Selects fAD divided by 3, fAD divided
by 6, or fAD divided by 12.
Nothing is assigned. In an attempt to write to these bits, write "0".
The value, if read, turns out to be "0".
Note 1: If the ADCON2 register is rewritten during A-D conversion, the conversion result will be indeterminate.
Note 2: Adjust the frequency of φAD to 10MHZ or less. φAD can be selected by combining CKS0 bit of ADCON0 register,
CKS1 bit of ADCON1 register and CKS2 bit of ADCON2 register.
CKS2
0
0
0
0
1
1
1
1
CKS1
0
0
1
1
0
0
1
1
CKS0
0
1
0
1
0
1
0
1
φAD
Divide-by-4 of fAD
Divide-by-2 of fAD
fAD
Ddivide-by-12 of fAD
Divide-by-6 of fAD
Divide-by-3 of fAD
A/D register i (i=0 to 7)
b7
b0
Symbol
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
Address
03C0 16
03C2 16
03C4 16
03C6 16
03C8 16
03CA 16
03CC 16
03CE 16
After reset
Indeterminate
Indeterminate
Indeterminate
Indeterminate
Indeterminate
Indeterminate
Indeterminate
Indeterminate
Function
RW
A/D conversion result
RO
Figure 12.3 ADCON2 Register, and AD0 to AD7 Registers
Rev.2.10 Oct 25, 2006 Page 166 of 326
REJ03B0152-0210