M16C65 Datasheet, PDF (711/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
27. A/D Converter
27.4.5 Repeat Sweep Mode 1
In repeat sweep mode 1, the analog voltage applied to eight selected pins including some prioritized
pins is repeatedly converted to a digital code. Table 27.12 lists the Repeat Sweep Mode 1
Specifications.
Table 27.12 Repeat Sweep Mode 1 Specifications
Item
Specification
Function
The input voltage of all eight pins selected by bits ADGSEL1 to ADGSEL0
in the ADCON2 register is repeatedly converted to a digital code. One to
four pins selected by SCAN1 to SCAN0 in the ADCON1 register is/are
converted by priority.
Example: If AN0 is prioritized, input voltage is converted to a digital code
in the following order:
AN0→AN1→AN0→AN2→AN0→AN3 •••
A/D conversion start
• When the TRG bit in the ADCON0 register is 0 (software trigger),
conditions
the ADST bit in the ADCON0 register is set to 1 (A/D conversion start).
• When the TRG bit is 1 (ADTRG trigger),
input level at the ADTRG pin changes from high to low after the ADST
bit is set to 1 (A/D conversion start).
A/D conversion stop
Set the ADST bit to 0 (A/D conversion stop).
condition
Interrupt request
No interrupt requests generated
generation timing
Analog input pins to be given ^{Select from AN0 (1 pin), AN0 and AN1 (2 pins), AN0 to AN2 (3 pins), and}
priority when A/D converted ^{AN0 to AN3 (4 pins).}
AN0_0 to AN0_3 and AN2_0 to AN2_3 can be selected in the same way.
Reading of A/D conversion Read the registers among AD0 to AD7 that corresponds to the selected
result
pins.
27.4.5.1 A/D Control Register 0 (ADCON0) (In Repeat Sweep Mode 1)
A/D Control Register 0
b7 b6 b5 b4 b3 b2 b1 b0
11
Symbol
ADCON0
Address
03D6h
After Reset
0000 0XXXb
Bit Symbol
Bit Name
Function
RW
CH0
RW
CH1 Analog input pin select bit Invalid in repeat sweep mode 1
RW
CH2
RW
MD0
b4 b3
A/D operation mode select ^{1 1 : Repeat sweep mode 0 or}
RW
bit 0
repeat sweep mode 1
MD1
RW
TRG Trigger select bit
0 : Software trigger
1 : ADTRG trigger
RW
ADST
A/D conversion start flag
0 : A/D conversion stop
1 : A/D conversion start
RW
CKS0 Frequency select bit 0
Refer to the CKS0 bit in the ADCON0
register
RW
If the ADCON0 register is rewritten during A/D conversion, the conversion result is undefined.
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
Page 676 of 791