Function; Software Start Mode; Repeat Mode - Philips CEM2100/00 Service Manual

17.3 Function

17.3.1 Software Start Mode

After setting ADCCR1<AMD> to "01" (software start mode), set ADCCR1<ADRS> to "1". AD conver-
sion of the voltage at the analog input pin specified by ADCCR1<SAIN> is thereby started.
After completion of the AD conversion, the conversion result is stored in AD converted value registers
(ADCDR1, ADCDR2) and at the same time ADCDR2<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 ADCCR1<ADRS> newly again
(Restart) during AD conversion. Before setting ADRS newly again, check ADCDR2<EOCF> to see that the
conversion is completed or wait until the interrupt signal (INTADC) is generated (e.g., interrupt handling rou-
tine).
ADCCR1<ADRS>
ADCDR2<ADBF>
ADCDR1 status
ADCDR2<EOCF>
INTADC interrupt request
ADCDR1
ADCDR2

17.3.2 Repeat Mode

AD conversion of the voltage at the analog input pin specified by ADCCR1<SAIN> is performed repeatedly.
In this mode, AD conversion is started by setting ADCCR1<ADRS> to "1" after setting ADCCR1<AMD> to
"11" (Repeat mode).
After completion of the AD conversion, the conversion result is stored in AD converted value registers
(ADCDR1, ADCDR2) and at the same time ADCDR2<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 ADCCR1<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.
AD conversion start AD conversion start
Indeterminate 1st conversion result
Conversion result
read
Conversion result
read
Figure 17-2 Software Start Mode
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T5CL8
2nd conversion result
EOCF cleared by reading
conversion result
Conversion result
read
Conversion result
read