M16C26A Datasheet, PDF (204/352 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/26A Group (M16C/26A, M16C/26B, M16C/26T)
14. A/D Converter
A/D control register 0 (1)
b7 b6 b5 b4 b3 b2 b1 b0
00
Symbol
ADCON0
Address
03D616
After reset
00000XXX 2
Bit symbol
Bit name
Function
RW
CH0
Analog Input Pin
Select Bit (2, 3)
b2 b1 b0
0 0 0 : Select AN 0
0 0 1 : Select AN 1
RW
0 1 0 : Select AN 2
CH1
0 1 1 : Select AN 3
RW
1 0 0 : Select AN 4
1 0 1 : Select AN 5
CH2
1 1 0 : Select AN 6
RW
1 1 1 : Select AN 7
MD0
MD1
TRG
ADST
A/D Operation Mode
Select Bit 0 (3)
Trigger Select Bit
A/D Conversion Start
Flag
b4 b3
0 0 : One-shot mode or delayed trigger mode
0,1
0 : Software trigger
1 : Hardware trigger (AD TRG trigger)
0 : A/D conversion disabled
1 : A/D conversion started
RW
RW
RW
RW
CKS0
Frequency Select Bit 0
See Table 14.2 A/D Conversion
Frequency Select
RW
NOTES:
1. If the ADCON0 register is rewritten during A/D conversion, the conversion result will be indeterminate.
2. AN30 to AN32 and AN24 can be used in the same way as AN0 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.
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
SCAN0
A/D Sweep Pin
Select Bit
Invalid in one-shot mode
RW
SCAN1
RW
MD2
BITS
CKS1
VCUT
(b7-b6)
A/D Operation Mode
Select Bit 1
8/10-Bit Mode Select Bit
0 : Any mode other than repeat sweep
mode 1
0 : 8-bit mode
1 : 10-bit mode
Frequency Select Bit 1 ^{Refer to Table 14.2 A/D Conversion}
Frequency Select
VREF Connect Bit (2)
1 : VREF connected
Nothing is assigned. When write, set to “0”.
When read, its content is “0”.
RW
RW
RW
RW
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 (AN i)
0 1 : Select port P9 group (AN 3i)
1 0 : Do not set
1 1 : Select port P9 group (AN 24)
Set to “0”
See Table 14.2 A/D Conversion
Frequency Select
RW
RW
RW
RW
RW
RW
TRG1
Trigger Select Bit 1
Set to "0" in one-shot mode
RW
(b7-b6)
Nothing is assigned. When write, set to “0”.
When read, its content is “0”.
NOTE:
1. If the ADCON2 register is rewritten during A/D conversion, the conversion result will be indeterminate.
Figure 14.1.1.2 ADCON0 to ADCON2 Registers in One-Shot Mode
Rev. 2.00 Feb.15, 2007 ^{page 187} of 329
REJ09B0202-0200