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Bit symbol
VREFON
ADMOD1
(02B1H)
Read/Write
R/W
After Reset
VREF
application
Function
control
0: OFF
1: ON
(note): As pin AN3 also functions as the ADTRG input pin, do not set < ADCH2: 0> = "011" when using ADTRG
with < ADTRGE> ="0".
A/D Mode Control Register 1
7
6
5
I2AD
R/W
0
0
IDLE2
0: Stop
1: Operate
<ADCH2,
ADCH1, ADCH0>
Figure 3.11.3 A/D Converter related registers
91C824-181
4
3
ADTRGE
ADCH2
0
A/D external
Analog input channel selection
trigger start
control
0: disable
1: enable
Analog input channel selection
<SCAN>
0
channel
fixed
000
AN0
001
AN1
010
AN2
011(Note)
AN3
100
AN4
101
AN5
110
AN6
111
AN7
A/D conversion start control by external trigger
(ADTRG input)
0
Disabled
1
Enabled
IDLE2 control
0
Stopped
1
In operation
Control of application of reference voltage to
A/D converter
0
OFF
1
ON
Before starting conversion (before writing "1" to
ADMOD0 <ADS>), set the <VREFON> bit to
"1".
TMP91C824
2
1
0
ADCH1
ADCH0
R/W
0
0
0
1
channel
scanned
AN0
AN0 → AN1
AN0 → AN1 → AN2
AN0 → AN1 → AN2 → AN3
AN4
AN4 → AN5
AN4 → AN5 → AN6
AN4 → AN5 → AN6 → AN7
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