47CHAPTER 1 OUTLINE (μPD78078 SUBSERIES)1.9 Mask OptionsThe mask ROM versions (μPD78076, 78078) provide pull-up register mask options which allow users to specifywhether to connect a pull-up register to a specific port pin when the user places an order for the device production.Using this mask option when pull-up resistors are required reduces the number of components to add to the device,resulting in board space saving.The mask options provided in theμPD78078 Subseries are shown in Table 1-1.Table 1-1. Mask Options of Mask ROM VersionsPin Names Mask OptionsP60 to P63, P90 to P93 Pull-up resistor connection can be specifiedin 1-bit units.1.10 Differences withμPD78054 SubseriesTheμPD78078 Subseries is upward-compatible with theμPD78054 Subseries. The differences between the twosubseries are shown in the table below. The functions and specifications other than those shown in this table arecommon to these two series.Table 1-2. Differences betweenμPD78078 Subseries andμPD78054 SubseriesSubseriesμPD78054 SubseriesμPD78078 SubseriesItemNo. of I/O ports 69 888-bit timer/event counter 2 channnels 4 channelsExternal device Address bus separate function Address bus separate functionexpansion function is not provided. is provided. (P80/A0 to P87/A7)Power supply voltage V DD = 2.0 to 6.0 V V DD = 1.8 to 5.5 VPackage 80-pin plastic TQFP (12 x 12 mm) 100-pin plastic TQFP (14 x 14 mm)80-pin plastic QFP (14 x 14 mm) 100-pin plastic LQFP (14 x 14 mm)80-pin plastic WQFP (14 x 14 mm)* 100-pin plastic QFP (14 x 20 mm)100-pin plastic WQFP (14 x 20 mm)** : Only for PROM version * : Only for PROM version
