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How does H8S/21xx support 24 ADC channels when it only has 8 inputs?

Latest Updated:03/23/2009

Question:

How does the H8S/21xx support 24 ADC channels when the ADC peripheral only has 8 inputs?

Answer:

The H8S/21xx series has a dedicated analogue input port, Port 7. These 8 inputs are fed directly into the ADC multiplexer. In addition to Port 7, the inputs signals of Port A and Port 6 can be directed to the ADC. Input signals on Port A are multiplexedinto channel AN6 and input signals on Port 6 are multiplexed into channel AN7. It is therefore possible to have 24 analogue input signals, multiplxed into the 8 channel ADC. It should be noted that there is a small reduction in accuracy when using the Port A and Port 6.
Suitable Products
H8S/2668
H8S/2655
H8S/2643
H8S/2633
H8S/2628
H8S/2615
H8S/2612
H8S/2437
H8S/2368
H8S/2398, 2357
H8S/2355
H8S/2350
H8S/2345
H8S/2282, 2280
H8S/2276
H8S/2258, 2239, 2238, 2237, 2227
H8S/2245
H8S/2215
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H8S/2199R
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H8S/2168
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H8S/2110B