NEC uPD78P078 - Manual (Page 63)

63
CHAPTER 2 OUTLINE (
µ
PD78078Y SUBSERIES)
2.9 Mask Options
The mask ROM versions (
µ
PD78076Y, 78078Y) provide pull-up register mask options which allow users to specify
whether 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 the
µ
PD78078Y Subseries are shown in Table 2-1.
Table 2-1. Mask Options of Mask ROM Versions
Pin Names Mask Options
P60 to P63, P90 to P93 Pull-up resistor connection can be specified
in 1-bit units.
2.10 Differences with
µ
PD78054Y Subseries
The
µ
PD78078Y Subseries is upward-compatible with the
µ
PD78054Y Subseries. The differences between the
two subseries are shown in the table below. The functions and specifications other than those shown in this table
are common to these two series.
Table 2-2. Differences between
µ
PD78078Y Subseries and
µ
PD78054Y Subseries
Subseries
µ
PD78054Y Subseries
µ
PD78078Y Subseries
Item
No. of I/O ports 69 88
8-bit timer/event counter 2 channnels 4 channels
External device Address bus separate function Address bus separate function
expansion 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 V
Package 80-pin plastic QFP (14 x 14 mm) 100-pin plastic QFP (14 x 20 mm)
80-pin plastic WQFP (14 x 14 mm)* 100-pin plastic LQFP (14 x 14 mm)
* : Only for PROM version 100-pin plastic WQFP (14 x 20 mm)*
* : Only for PROM version