Analog/Digital Converter - Toshiba TLCS-900/H1 Series Data Book

3.11 Analog/Digital Converter

The TMP92CH21 incorporates a 10-bit successive approximation-type analog/digital converter
(AD converter) with 4-channel analog input.
Figure 3.11.1 is a block diagram of the AD converter. The 4-channel analog input pins (AN0∼AN3)
are shared with the input-only port Port G so they can be used as an input port.
Note: When IDLE2, IDLE1 or STOP Mode is selected, as to reduce the power, with some timings the
system may enter a standby mode even though the internal comparator is still enabled.
Therefore be sure to check that AD converter operations are halted before a HALT instruction
is executed.
AD mode control register 1,2
ADMOD1 ,2 <ADTRGE>
<ADCH2∼ADCH0><VREFON>
Analog input
AN3 /ADTRG(PG3)
AN2 (PG2)
AN1 (PG1)
AN0 (PG0)
VREFH
VREFL
Internal data bus
<EOCF><ADBF><ITM0><REPET><SCAN><ADS>
End
Channel select
Sample and
Hold
Figure 3.11.1 Block diagram of AD converter
92CH21 - 281
AD mode control register 0
ADMOD0
Scan
Repeat
Interrupt
Busy
AD Converter Control
Circuit
+
−
Comparator
DA converter
TMP92CH21
ADTRG
Start
INTAD
interrupt
AD Conversion Result
Register
ADREG0L~ADREG3L
ADREG0H~ADREG3H