M16C26A Datasheet, PDF (226/352 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
000111
Symbol
ADCON0
Address
03D616
After reset
00000XXX 2
Bit symbol
Bit name
Function
RW
CH0
Analog Input Pin
Select Bit
b2 b1 b0
1 1 1 : Set to "111b" in delayed trigger
RW
mode 1
CH1
RW
CH2
RW
MD0
MD1
TRG
ADST
A/D Operation Mode
Select Bit 0
Trigger Select Bit
A/D Conversion Start
Flag ⁽²⁾
b4 b3
0 0 : One-shot mode or delayed trigger mode
0,1
Refer to Table 14.1.8.2 Trigger Select Bit
Setting in Delayed Trigger Mode 1
0 : A/D conversion disabled
1 : A/D conversion started
CKS0
Frequency Select Bit 0
Refer to Table 14.2 A/D Conversion
Frequency Select
NOTES:
1. If the ADCON0 register is rewritten during A/D conversion, the conversion result will be indeterminate.
2. Do not write “1” in delayed trigger mode 1. When write, set to "0".
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
SCAN0
A/D Sweep Pin
Select Bit ⁽²⁾
SCAN1
When selecting delayed trigger mode 1
b1 b0
0 0: AN0 to AN1 (2 pins)
0 1: AN0 to AN3 (4 pins)
1 0: AN0 to AN5 (6 pins)
1 1: AN0 to AN7 (8 pins)
MD2
BITS
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
CKS1
VCUT
Frequency Select Bit 1
VREF Connect Bit (3)
Refer to Table 14.2 A/D Conversion
Frequency Select
1 : VREF connected
(b7-b6)
Nothing is assigned. When write, set to “0”.
When read, its content is “0”.
RW
RW
RW
RW
RW
RW
RW
NOTES:
1. If the ADCON1 register is rewritten during A/D conversion, the conversion result will be indeterminate.
2. AN30 to AN32 can be used in the same way as AN0 to AN7. Use the ADGSEL1 to ADGSET0 bits in the ADCON2
register to select the desired pin.
3. If the VCUT bit is reset from “0” (VREF unconnected) to “1” (VREF connected), wait for 1 µs or more before startingA/D
conversion.
A/D control register 2 ⁽¹⁾
b7 b6 b5 b4 b3 b2 b1 b0
10
1
Symbol
ADCON2
Address
03D416
After reset
0016
Bit symbol
Bit name
Function
RW
SMP
A/D Conversion Method
Select Bit ⁽²⁾
1 : With sample and hold
RW
ADGSEL0 A/D Input Group
b2 b1
0 0 : Select port P10 group (AN i)
RW
Select Bit
0 1 : Select port P9 group (AN 3i)
ADGSEL1
1 0 : Do not set
1 1 : Do not set
RW
(b3)
Reserved Bit
Set to “0”
RW
CKS2
Frequency Select Bit 2
Refer to Table 14.2 A/D Conversion
Frequency Select
RW
TRG1
Trigger Select Bit 1
Refer to Table 14.1.8.2 Trigger Select Bit
Setting in Delayed Trigger Mode 1
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.
2. Set to “1” in delayed trigger mode 1.
Figure 14.1.8.4 ADCON0 to ADCON2 Registers in Delayed Trigger Mode 1
Rev. 2.00 Feb.15, 2007 ^{page 209} of 329
REJ09B0202-0200