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7
ADMOD1
Bit symbol
VREFON
(02B1H)
Read/Write
After reset
0
Function
VREF
application
control
0: OFF
1: ON
Note: As pin AN3 also functions as the
with <ADTRGE> = 0.
ADTRG
AD Mode Control Register 1
6
5
I2AD
R/W
0
IDLE2
0: Stop
1: Operate
<ADCH2:0>
000
001
010
011 (Note)
100
101
110
111
input pin, do not set <ADCH2:0> = 011 when using
ADTRG
Figure 3.11.3 AD Converter Related Registers
91C824-184
4
3
2
ADTRGE
ADCH2
R/W
0
0
Analog input channel selection
AD external
trigger start
control
0: Disable
1: Enable
Analog input channel selection
<SCAN>
0
Channel
fixed
AN0
AN0
AN0 → AN1
AN1
AN0 → AN1 → AN2
AN2
AN0 → AN1 → AN2 → AN3
AN3
AN4
AN4
AN4 → AN5
AN5
AN4 → AN5 → AN6
AN6
AN4 → AN5 → AN6 → AN7
AN7
AD conversion start control by external trigger
(
input)
ADTRG
0 Disabled
1 Enabled
IDLE2 control
0 Stopped
1 In operation
Control of application of reference voltage to
AD converter
0 OFF
1 ON
Before starting conversion (before writing 1 to
ADMOD0<ADS>), set the <VREFON> bit to 1.
TMP91C824
1
0
ADCH1
ADCH0
0
0
1
Channel
scanned
2008-02-20
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