tmp19a61f10xbg TOSHIBA Semiconductor CORPORATION, tmp19a61f10xbg Datasheet - Page 436

• Manufacturer Part Number: tmp19a61f10xbg
• Description: 32-bit Tx System Risc Tx19 Family
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Top-priority
A/D conversion is activated.
16.3 Description of Operations
16.3.1
16.3.2
Conversion
Ch
Analog Reference Voltage
Selecting the Analog Input Channel
The "H" level of the analog reference voltage shall be applied to the VREFH pin, and the
"L" level shall be applied to the VREFL pin. By writing "0" to the ADAMOD1<VREFON>
bit, a switched-on state of VREFH − VREFL can be turned into a switched-off state. To
start A/D conversion, make sure that you first write "1" to the <VREFON> bit, wait for 3 μs
during which time the internal reference voltage should stabilize, and then write "1" to the
ADMOD0<ADS> bit.
How the analog input channel is selected is different depending on A/D converter
operation mode used.
(1)
•
One channel is selected from analog input pins AINA0 through AINA15 by setting
ADAMOD1<ADCH3 to 0> to an appropriate setting.
•
(2)
One channel is selected from analog input pins AINA0 through AINA15 by setting
ADAMOD2 ＜ HPADCH3 to 0> to an appropriate setting.
initialized to "0000." This initialization works as a trigger to select a fixed channel input
through the ANA0 pin. The pins that are not used as analog input channels can be used
as ordinary input ports.
If top-priority A/D conversion is activated during normal A/D conversion, normal A/D
conversion is discontinued, top-priority A/D conversion is executed and completed, and
then normal A/D conversion is resumed.
Example: A case in which repeat-scan conversion is ongoing at channels AINA0 through
AINA3 with ADAMOD0<REPEAT ： SCAN> set to "11" and ADAMOD1<ADCH3:0> set to
0011, and top-priority A/D conversion has been activated at AINA15 with
ADAMOD2<HPADCH3:0>=1111:
After a reset, ADMOD0<SCAN> is initialized to "0" and ADAMOD1<ADCH3:0> is
One scan mode is selected from 16 scan modes by setting ADAMOD1 <ADCH3 to 0>
and ADSCN to appropriate settings.
If the analog input channel is used in a fixed state (ADAMOD0<SCAN> = “0”):
If the analog input channel is used in a scan state (ADAMOD0<SCAN> = "1"):
Ch0
Normal A/D conversion mode
Top-priority A/D conversion mode
Ch1
TMP19A61 (rev1.0)16-435
Ch2
Ch15
Ch2
TMP19A61
Ch3
Ch0