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Download uPD780948 Subseries 8-bit Single
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Chapter 2 Pin Function (µPD780948 Subseries) 2.3.22 VSS Ground potential pin. The ground pin VSS1 corporates the ground of the port, while VSS2 corporates the ground of the oscillator, the CPU and the peripherals. 2.3.23 VPP (µPD78F0948 only) High-voltage apply pin for FLASH programming mode setting. Connect directly to VSS in normal operating mode. 2.3.24 IC (Mask ROM version only) The IC (Internally Connected) pin is provided to set the test mode to check the µPD78F0948 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. Figure 2-1: Vss Connection of IC Pins IC As short as possible Caution: Connect IC pins to VSS pins directly. User’s Manual U12670EE3V0UD00 47
