Panasonic MN101L Series

Chapter 16
A/D Converter (ADC)
Operation XVI - 9
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Set ANCTR0.ANLADE to "1", then start A/D conversion after waiting for 12 conversion
clocks.
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When ADC is started again after setting ANCTR2.ANST to "0" and ADC was stopped by
force during A/D conversion, start ADC after waiting for an equivalent time of (2 system
clock) + (2 converter clock) or longer.
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When the A/D conversion is converted that select the start by External interrupt 0, Timer 7
interrupt or A/D conversion interrupt as the start A/D conversion factor and set the
ANCTR2.ANST to "0" during A/D conversion and A/D conversion is finished forcibly; if the
conversion is stopped forcibly by setting ANCTR2.ANST to "0", set the ANCTR2.ANSTSEL1-
0 to "00" before setting ANCTR2.ANST.
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If the data of ANCTR0 or ANCTR1 is changed during A/D conversion, the operation and the
result of A/D conversion cannot be guaranteed.
Set the ANCTR.ANLADE to "0" to turn the A/D resistor ladder off before changing the data of
ANCTR0 or ANCTR1.
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Figure:16.3.1 Operation of A/D conversion (sample hold time at T
ADCLK
× 2)
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Before reading out the value of the A/D conversion, A/D conversion should be done several
times to prevent noise error by confirming the match of level by program, or by using the
average value.
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2,3 4,5 61 17 18 19,20
ANST bit
A/D conversion clock
A/D conversion start
A/D conversion time
T
S
Sampling
bit 11
comparison
Determine
bit 1
Determine
bit 10
Determine
bit 11
A/D conversion
interrupt (ADIRQ)
Determine
bit 0
A/D conversion
end
converter
data store
TADCLK
7
bit 10
comparison
bit 0
comparison
preparation
period