M16C28 Datasheet, PDF (266/423 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
00 0 1 1 1
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
A/D Operation Mode
Select Bit 0
Trigger Select Bit
b4 b3
0 0 : One-shot mode or delayed trigger mode
0,1
Refer to Table 15.13
RW
RW
RW
ADST
A/D Conversion Start
Flag
(2)
0 : A/D conversion disabled
1 : A/D conversion started
RW
CKS0 Frequency Select Bit 0 Refer to Table 15.2
RW
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".
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
A/D Sweep Pin
SCAN0 _{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 Frequency Select Bit 1 ^{Refer to Table 15.2}
RW
RW
RW
RW
RW
RW
VCUT Vref Connect Bit (3)
1 : Vref connected
RW
(b7-b6)
Nothing is assigned. When write, set to "0".
When read, its content is indetermintae.
NOTES:
1. If the ADCON1 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 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 starting
A/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
SMP
A/D Conversion Method
Select Bit (2)
ADGSEL0 A/D Input Group
Select Bit
ADGSEL1
Function
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
(b3)
CKS2
Reserved Bit
Frequency Select Bit 2
Set to “0”
Refer to Table 15.2
RW
RW
RW
RW
RW
RW
TRG1
Trigger Select Bit 1
Refer to Table 15.13
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 15.27 ADCON0 to ADCON2 Registers in Delayed Trigger Mode 1
Rev. 2.00 Jan. 31, 2007 ^{page 246} of 385
REJ09B0047-0200