UPD17010 Datasheet, PDF (143/424 Pages) NEC – 4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE DEDICATED TO DIGITAL TUNING SYSTEM

µPD17010
(3) Notes on using P0D0/ADC2 through P0D3/ADC5 pins as A/D converter pins
A/D input
P0D3/ADC5
Latch
A/D input
P0D2/ADC4
P0D1/ADC3
P0D0/ADC2
General-purpose output port or LCD segment signal output
When any of the P0D0/ADC2 through P0D3/ADC5 pins is selected as the A/D converter pins, the selected pin (only
one pin can be selected at a time) is disconnected from the input latch and connected to the internal A/D converter.
If a high level happens to be input to the pin when the pin is selected to the A/D converter, the latch circuit retains
the high level
If the “HALT 0001B” instruction is executed in this status, the halt status is immediately released because the input
latch is high.
To avoid this, set the input port mode before executing the “HALT 0001B” instruction, and inputs a low level to the
A/D converter.
(4) Others
Output port
Microcontroller, etc.
P0D3/ADC5
Latch
P0D2/ADC4
P0D1/ADC3
P0D0/ADC2
General-purpose output port or LCD segment signal output
The P0D0/ADC2 through P0D3/ADC5 pins can be used as general-purpose input port pins with pull-down resistor.
Therefore, the halt status can also be released by another microcontroller as shown above.
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