Single Sweep Mode - Renesas M16C/29 Series Hardware Manual

M16C/29 Group

15.1.3 Single Sweep Mode

In single sweep mode, analog voltage is applied to the selected pins are converted one-by-one to a digital
code. Table 15.1.3.1 shows the single sweep mode specifications. Figure 15.1.3.1 shows the operation
example in single sweep mode. Figure 15.1.3.2 shows the ADCON0 to ADCON2 registers in single
sweep mode.
Table 15.1.3.1 Single Sweep Mode Specifications
Item
Function
A/D Conversion Start Condition • When the TRG bit in the ADCON0 register is "0" (software trigger)
A/D Conversion Stop Condition • A/D conversion completed(When selecting a software trigger, the ADST bit
Interrupt Request Generation Timing A/D conversion completed
Analog Input Pin
Readout of A/D Conversion Result
Note 1. AN to AN
00 07
However, all input pins need to belong to the same group.
•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 15.1.3.1 Operation Example in Single Sweep Mode
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
The SCAN1 to SCAN0 bits in the ADCON1 register and the ADGSEL1 to
ADGSEL0 bits in the ADCON2 register select pins. Analog voltage applied to
the selected pins is converted one-by-one to a digital code
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 ADST bit
TRG
to "1" (A/D conversion started)
is set to "0" (A/D conversion halted)).
• Set the ADST bit to "0"
Select from AN
0
AN to AN (8 pins)
0 7
Readout one of the AD0 to AD7 registers that corresponds to the selected pin
, AN to AN , and AN
20 27
to AN
0
page 224 of 402
Specification
to AN (2 pins), AN to AN
1 0
)
(Note 1
to AN can be used in the same way as AN
30 32
to A/D sweep pins (SCAN1 to SCAN0="01
3
A/D interrupt request generated
15. A/D Converter
(4 pins), AN to AN (6 pins),
3 0 5
to AN
0
")
2
A/D pin input voltage
sampling
A/D pin conversion
.
7