A/D Control Register 1 (Adcon1) - Renesas M16C/64C User Manual

M16C/64C Group
27.2.6

A/D Control Register 1 (ADCON1)

A/D Control Register 1
b7 b6 b5 b4 b3 b2
If the ADCON1 register is rewritten during A/D conversion, the conversion result is undefined.
SCAN1-SCAN0 (A/D sweep pin select bit) (b1-b0)
These bits are disabled in one-shot and repeat modes. In single sweep mode, repeat sweep mode 0,
and repeat sweep mode 1, pins AN0_0 to AN0_7 and AN2_0 to AN2_7 can be used in the same way
as pins AN0 to AN7. Use bits ADGSEL1 to ADGSEL0 in the ADCON2 register to select the desired
group.
MD2 (A/D operation mode select bit 1) (b2)
A/D operation mode is selected by a combination of bits MD1 to MD0 in the ADCON0 register and the
MD2 bit. See Table 27.5 "A/D Operation Mode".
ADSTBY (A/D standby bit) (b5)
If the ADSTBY bit is changed from 0 (A/D operation stopped) to 1 (A/D operation enabled), wait for one
φ AD cycle or more before starting A/D conversion.
When the A/D converter is not used, no current flows in the A/D converter by setting the ADSTBY bit to
0 (A/D operation stopped: standby). This helps reduce power consumption.
R01UH0092EJ0110 Rev.1.10
Jul 31, 2012
b1 b0
Symbol
ADCON1
Bit Symbol Bit Name
SCAN0
A/D sweep pin select bit
SCAN1
A/D operation mode select
MD2
bit 1
—
No register bit. If necessary, set to 0. Read as undefined value
(b3)
CKS1 Frequency select bit 1
A/D standby bit
ADSTBY
ADEX0
Extended pin select bit
ADEX1
Address
03D7h
Function
In single sweep mode or repeat sweep
mode 0
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)
In repeat sweep mode 1
b1 b0
0 0: AN0 (1 pin)
0 1: AN0 to AN1 (2 pins)
1 0: AN0 to AN2 (3 pins)
1 1: AN0 to AN3 (4 pins)
0 : Any mode other than repeat sweep mode 1
1 : Repeat sweep mode 1
Refer to the CKS0 bit in the ADCON0
register.
0 : A/D operation stopped (standby)
1 : A/D operation enabled
In one-shot mode or repeat mode
b7 b6
0 0: ANEX0 to ANEX1 are not used
0 1: ANEX0 input is A/D converted
1 0: ANEX1 input is A/D converted
1 1: Do not set this value
27. A/D Converter
After Reset
0000 X000b
RW
RW
RW
RW
—
RW
RW
RW
RW
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