uPD780065 Subseries PUM - Renesas Electronics

2.2.11 AVREF
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CHAPTER 2 PIN FUNCTION
This is an A/D converter reference voltage input pin. This pin is also used for analog power supply.
When no A/D converter is used, connect this pin to VSS0.
2.2.12 AVSS
This is a ground voltage pin of A/D converter. Always use the same voltage as that of the VSS0 pin even when
no A/D converter is used.
2.2.13 RESET
This is a low-level active system reset input pin.
2.2.14 X1 and X2
Crystal resonator connect pins for main system clock oscillation. For external clock supply, input clock signal to
X1 and its inverted signal to X2.
2.2.15 XT1 and XT2
Crystal resonator connect pins for subsystem clock oscillation.
For external clock supply, input the clock signal to XT1 and its inverted signal to XT2.
2.2.16 VDD0 and VDD1
VDD0 is a positive power supply port pin.
VDD1 is a positive power supply pin other than port pin.
2.2.17 VSS0 and VSS1
VSS0 is a ground potential port pin.
VSS1 is a ground potential pin other than port pin.
2.2.18 VPP (flash memory version only)
High-voltage apply pin for flash memory programming mode setting and program write/verify.
Connect directly to VSS0 or VSS1 in the normal operating mode.
2.2.19 IC (mask ROM version only)
The IC (Internally Connected) pin is provided to set the test mode to check the μPD780065 Subseries at delivery.
Connect it directly to the VSS0 or VSS1 with the shortest possible wire in the normal operating mode.
When a voltage difference is produced between the IC pin and VSS0 pin or VSS1 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 operate normally.
• Connect IC pin to VSS0 pin or VSS1 pin directly.
VSS0 or VSS1
IC
As short as possible
Preliminary User’s Manual U13420EJ2V0UM00