M16C28 Datasheet, PDF (246/423 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/28 Group (M16C/28, M16C/28B)
15. A/D Converter
A/D Control Register 0 ⁽¹⁾
b7 b6 b5 b4 b3 b2 b1 b0
01
Symbol
ADCON0
Address
03D616
After Reset
00000XXX 2
Bit Symbol
Bit Name
CH0
Analog Input Pin
Select Bit ^{(2, 3)}
CH1
CH2
MD0
MD1
TRG
ADST
CKS0
A/D Operation Mode
Select Bit 0⁽³⁾
Trigger Select Bit
A/D Conversion Start
Flag
Frequency Select Bit 0
Function
b2 b1 b0
0 0 0 : Select AN 0
0 0 1 : Select AN 1
0 1 0 : Select AN 2
0 1 1 : Select AN 3
1 0 0 : Select AN 4
1 0 1 : Select AN 5
1 1 0 : Select AN 6
1 1 1 : Select AN 7
b4 b3
0 1 : Repeat mode
0 : Software trigger
1 : Hardware trigger (AD TRG trigger)
0 : A/D conversion disabled
1 : A/D conversion started
Refer to Table 15.2
NOTES:
1. If the ADCON0 register is rewritten during A/D conversion, the conversion result will be indeterminate.
2. AN00 to AN07 and AN20 to AN27 can be used in the same way as AN 0 to AN7. Use the ADGSEL1 to
ADGSEL0 bits in the ADCON2 register to select the desired pin.
3. After rewriting the MD1 to MD0 bits, set the CH2 to CH0 bits over again using an another instruction.
RW
RW
RW
RW
RW
RW
RW
RW
RW
A/D Control Register 1 ⁽¹⁾
b7 b6 b5 b4 b3 b2 b1 b0
1
0
Symbol
ADCON1
Address
03D716
After Reset
0016
Bit Symbol
Bit Name
Function
RW
A/D Sweep Pin
Invalid in repeat mode
RW
SCAN0 _{Select Bit}
SCAN1
RW
MD2
A/D Operation Mode
Select Bit 1
0 : Any mode other than repeat sweep
mode 1
RW
BITS
8/10-Bit Mode Select Bit 0 : 8-bit mode
1 : 10-bit mode
RW
CKS1
Frequency Select Bit 1 ^{Refer to Table 15.2}
RW
VCUT
Vref connect bit ⁽²⁾
1 : Vref connected
RW
(b7-b6)
Nothing is assigned. When write, set to “0”.
When read, its content is “0”.
NOTES:
1. If the ADCON1 register is rewritten during A/D conversion, the conversion result will be indeterminate.
2. If the VCUT bit is reset from “0” (Vref unconnected) to “1” (Vref connected), wait for 1 µs or more before starting
A/D conversion.
A/D Control Register 2 ⁽¹⁾
b7 b6 b5 b4 b3 b2 b1 b0
00
Symbol
ADCON2
Address
03D416
After Reset
0016
Bit Symbol
Bit Name
SMP
A/D Conversion Method
Select Bit
ADGSEL0 A/D Input Group Select
Bit
ADGSEL1
(b3)
CKS2
Reserved Bit
Frequency Select Bit 2
Function
0 : Without sample and hold
1 : With sample and hold
b2 b1
0 0 : Select port P10 group
0 1 : Do not set
1 0 : Select port P0 group
1 1 : Select port P1/P9 group
Set to “0”
See Table 15.2
RW
RW
RW
RW
RW
RW
TRG1
Trigger Select Bit 1
Set to "0" in repeat mode
RW
(b7-b6)
Nothing is assigned. When write, set to “0”.
When read, its content is “0”.
NOTES:
1. If the ADCON2 register is rewritten during A/D conversion, the conversion result will be indeterminate.
Figure 15.9 ADCON0 to ADCON2 Registers in Repeat Mode
Rev. 2.00 Jan. 31, 2007 ^{page 226} of 385
REJ09B0047-0200