CHAPTER 3 PIN FUNCTION (µPD78070A)
3.2.19 AVSS
This is a ground voltage pin of A/D converter and D/A converter. Always use the same voltage as that of the VSS
pin even when not using A/D converter or D/A converter.
3.2.20 RESET
This is a low-level active system reset input pin.
3.2.21 X1, X2
Crystal resonator connect pins for main system clock oscillation.
For external clock supply, input it to X1 and its inverted signal to X2.
3.2.22 XT1, XT2
Crystal resonator connect pins for subsystem clock oscillation.
For external clock supply, input it to XT1 and its inverted signal to XT2.
3.2.23 VDD
This is a positive power supply pin.
3.2.24 VSS
This is a ground potential pin.
3.2.25 IC
The IC (Internally Connected) pin is provided to set the test mode to check the µPD78070A at delivery. Connect
it directly to the VSS with the shortest possible wire in the normal operating mode.
When a voltage difference is produced between the IC pin and VSS pin because the wiring between those two pins
is too long or an external noise is input to the IC pin, the user’s program may not run normally.
• Connect IC pin to VSS pin directly.
VSS
IC
As short as possible
65
ETC [ ETC ]
