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When port sets as the analog input, is it correct to think that shoot-through current does not flow unless port is read?

Last Updated:12/26/2017

Question:

When port sets as the analog input, is it correct to think that shoot-through current does not flow unless port is read?  If so, if a port is used for mixed digital input and analog input, doesn't shoot-through current flow when this port is read, because it is being used for analog input?

Answer:

No. For a port set to analog input, the input buffer is turned off by the signal set to analog input. Thus, shoot-through current does not flow even if the port is read. A portion of Figure 2-8. Pin Block Diagram for Pin Type 7-3-1 of the RL78/G13 is shown for reference. Here, the AND gate between the pin and selector is turned off by the settings of the PMCmn register which designates a pin as analog input. Thus, shoot-through current does not flow into the input even if the pin voltage is intermediate level.

Suitable Products
RL78 Family