TMP88PH41NG Datasheet, PDF (171/194 Pages) Toshiba Semiconductor – 8 Bit Microcontroller

TMP88PH41NG
15.3 Function
15.3.1 Software Start Mode
After setting ADCCRA<AMD> to “01” (software start mode), set ADCCRA<ADRS> to “1”. AD conver-
sion of the voltage at the analog input pin specified by ADCCRA<SAIN> is thereby started.
After completion of the AD conversion, the conversion result is stored in AD converted value registers
(ADCDRH, ADCDRL) and at the same time ADCDRL<EOCF> is set to 1, the AD conversion finished inter-
rupt (INTADC) is generated.
ADRS is automatically cleared after AD conversion has started. Do not set ADCCRA<ADRS> newly again
(Restart) during AD conversion. Before setting ADCCRA<ADRS> newly again, check ADCDRL<EOCF> to
see that the conversion is completed or wait until the interrupt signal (INTADC) is generated (e.g., interrupt
handling routine).
ADCCRA<ADRS>
AD conversion start
AD conversion start
ADCDRL<ADBF>
ADCDRH status
ADCDRL<EOCF>
Indeterminate
1st conversion result
2nd conversion result
EOCF cleared by reading
conversion result
INTADC interrupt request
ADCDRH
ADCDRL
Conversion result
read
Conversion result
read
Conversion result
read
Conversion result
read
Figure 15-2 Software Start Mode
15.3.2 Repeat Mode
AD conversion of the voltage at the analog input pin specified by ADCCRA<SAIN> is performed repeat-
edly. In this mode, AD conversion is started by setting ADCCRA<ADRS> to “1” after setting ADC-
CRA<AMD> to “11” (Repeat mode).
After completion of the AD conversion, the conversion result is stored in AD converted value registers
(ADCDRH, ADCDRL) and at the same time ADCDRL<EOCF> is set to 1, the AD conversion finished inter-
rupt (INTADC) is generated.
In repeat mode, each time one AD conversion is completed, the next AD conversion is started. To stop AD
conversion, set ADCCRA<AMD> to “00” (Disable mode) by writing 0s. The AD convert operation is stopped
immediately. The converted value at this time is not stored in the AD converted value register.
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