Operation Modes; One-Shot Mode - Renesas M16C/29 Series Hardware Manual

M16C/29 Group

15.1 Operation Modes

15.1.1 One-Shot Mode

In one-shot mode, analog voltage applied to a selected pin is once converted to a digital code. Table
15.1.1.1 shows the one-shot mode specifications. Figure 15.1.1.1 shows the operation example in one-
shot mode. Figure 15.1.1.2 shows the ADCON0 to ADCON2 registers in one-shot mode.
Table 15.1.1.1 One-shot Mode Specifications
Item
Function
A/D Conversion Start
Condition
A/D Conversion Stop
Condition
Interrupt Request Generation Timing A/D conversion completed
Analog Input Pin
Readout of A/D Conversion Result
•Example when selecting AN
A/D conversion started
AN
0
AN
1
AN
2
AN
3
AN
4
AN
5
AN
6
AN
7
Figure 15.1.1.1 Operation Example in One-Shot Mode
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
The CH2 to CH0 bits in the ADCON0 register and the ADGSEL1 to
ADGSEL0 bits in the ADCON2 register select pins. Analog voltage applied to
a selected pin is once converted to a digital code
• When the TRG bit in the ADCON0 register is "0" (software trigger)
Set the ADST bit in the ADCON0 register to "1" (A/D conversion started)
• When the TRG bit in the ADCON0 register is "1" (hardware trigger)
The AD pin input changes state from "H" to "L" after setting the
TRG
ADST bit to "1" (A/D conversion started)
• A/D conversion completed (If a software trigger is selected, the ADST bit is
set to "0" (A/D conversion halted)).
• Set the ADST bit to "0"
Select one pin from AN
Readout one of the AD0 to AD7 registers that corresponds to the selected pin
to an analog input pin (Ch2 to CH0="010
2
A/D interrupt request generated
page 220 of 402
Specification
to AN , AN to AN , AN
0 7 00 07
15. A/D Converter
to AN , AN to AN
20 27 30 32
")
2
A/D pin input voltage
sampling
A/D pin conversion