RL78/G1P
CHAPTER 9 A/D CONVERTER
R01UH0895EJ0100 Rev.1.00
248
Nov 29, 2019
9.3.2 A/D converter mode register 0 (ADM0)
This register sets the conversion time for analog input to be A/D converted, and starts/stops conversion.
The ADM0 register can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 9-3. Format of A/D Converter Mode Register 0 (ADM0)
Address: FFF30H After reset: 00H R/W
Symbol
<7>
6 5 4 3 2 1
<0>
ADM1 ADCS
ADMD FR2
Note 1
FR1
Note 1
FR0
Note 1
0 LV0
Note 1
ADCE
ADCS
A/D conversion operation control
0
Stops conversion operation
[When read]
Conversion stopped/standby status
1
Enables conversion operation
[When read]
While in the software trigger mode: Conversion operation status
While in the hardware trigger wait mode: A/D power supply stabilization wait
conversion operation status
ADMD
Specification of the A/D conversion channel selection mode
0 Select
mode
1 Scan
mode
ADCE
A/D voltage comparator operation control
Note 2
0
Stops A/D voltage comparator operation
1
Enables A/D voltage comparator operation
Notes 1.
For details of the FR2 to FR0, LV0 bits, and A/D conversion, see
Table 9-3 A/D Conversion Time
Selection
.
2.
While in the software trigger mode or hardware trigger no-wait mode, the operation of the A/D voltage
comparator is controlled by the ADCS and ADCE bits, and it takes stabilization wait status from the start
of operation for the operation to stabilize. Therefore, when the ADCS bit is set to 1 after stabilization wait
status or more has elapsed from the time ADCE bit is set to 1, the conversion result at that time has
priority over the first conversion result. If the ADCS bit was set to 1 before the stabilization time elapsed,
ignore the first conversion data.
[Stabilization wait status]
If a high-accuracy channel is selected as the analog input channel:
0.5
s
If a test mode setting (ADTES1 bit of ADTES register = 1) is selected: 0.5
s
If a standard channel is selected as the analog input channel:
2
s
If a temperature sensor output/internal reference voltage output are selected as the analog input channel:
(ADISS bit of ADS register = 1):
2
s
Cautions 1. Change the ADMD, FR2 to FR0, and LV0 bits while in the conversion stopped status (ADCS = 0,
ADCE = 0).
2. Setting ADCS = 1, ADCE = 0 is prohibited.
3. Do not change the ADCE and ADCS bits from 0 to 1 at the same time by using an 8-bit
manipulation instruction. Be sure to set these bits in the order described in 9.7 A/D Converter
Setup Flowchart.
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