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M16C/29 Group
15.1.7 Delayed Trigger Mode 0
In delayed trigger mode 0, analog voltage is applied to the selected pins are converted one-by-one to a
digital code. The delayed trigger mode 0 used in combination with A/D trigger mode of Timer B. The
Timer B0 underflow starts a single sweep conversion. After completing the AN
pin is not sampled and converted until the Timer B1 underflow is generated. When the Timer B1 under-
flow is generated, the single sweep conversion is restarted with the AN
delayed trigger mode 0 specifications. Figure 15.1.7.1 shows the operation example in delayed trigger
mode 0. Figure 15.1.7.2 and Figure 15.1.7.3 show each flag operation in the ADSTAT0 register that
corresponds to the operation example. Figure 15.1.7.4 shows the ADCON0 to ADCON2 registers in
delayed trigger mode 0. Figure 15.1.7.5 shows the ADTRGCON register in delayed trigger mode 0 and
Table 15.1.7.2 shows the trigger select bit setting in delayed trigger mode 0.
Table 15.1.7.1 Delayed Trigger Mode 0 Specifications
Item
Function
A/D Conversion Start
A/D Conversion Stop
Condition
Interrupt Request
Generation Timing
Analog Input Pin
Readout of A/D Conversion Result Readout one of the AN0 to AN7 registers that corresponds to the selected pins
Note 1: Set the larger value than the value of the timer B0 register to the timer B1 register.
Note 2. Do not write "1" (A/D conversion started) to the ADST bit in delayed trigger mode 0. When write "1",
unexpected interrupts may be generated.
Note 3. AN
to AN
, AN
00
07
However, all input pins need to belong to the same group.
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
The SCAN1 to SCAN0 bits in the ADCON1 register and ADGSEL1 to ADGSEL0 bits in
the ADCON2 register select pins. Analog voltage applied to the input voltage of the
selected pins are converted one-by-one to the digital code. Timer B0 under flow
generation starts AN
after the AN
pin. (Note 1)
1
AN
pin conversion start condition
0
•When Timer B0 underflow is generated if Timer B0 underflow is generated
again before Timer B1 underflow is generated , the conversion is not affected
•When Timer B0 underflow is generated during A/D conversion of pins after the
AN
pin, conversion is halted and the sweep is restarted from AN
1
AN
pin conversion start condition
1
•When Timer B1 underflow is generated during A/D conversion of the AN
input voltage of the AN
sweep start when AN
•When single sweep conversion from the AN
•Set the ADST bit to "0" (A/D conversion halted)(Note 2)
A/D conversion completed
Select from AN
AN
to AN
(8 pins)(Note 3)
0
7
to AN
, and AN
t0 AN
20
27
30
page 233 of 402
Specification
pin conversion. Timer B1 underflow generation starts conversion
0
pin is sampled. The AN
1
conversion is completed.
0
to AN
(2 pins), AN
to AN
0
1
0
can be used in the same way as AN
32
15. A/D Converter
pin conversion, the AN
0
pin. Table 15.1.7.1 shows the
1
0
conversion and the rest of the
1
pin is completed
0
(4 pins), AN
to AN
(6 pins) and
3
0
5
to AN
.
0
7
1
pin, the
0
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