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