Specification Of Bilt-In Pull-Up Resistors; Specification Of Built-In Pull-Up Resistors - NEC PD750004 User Manual

5.1.5 Specification of Bilt-in Pull-Up Resistors

A pull-up resistor can be contained at each port pin of the µPD750008 (except for P00). Whether to use
the pull-up resistor can be specified by software (for some pins) or a mask option (for the other pins).
Table 5-4 shows how a built-in pull-up resistor is specified for each port pin. The built-in pull-up resistor
is connected by software in the format shown in Figure 5-8.
Port (pin name)
Port 0 (P01-P03) Note
Port 1 (P10-P13)
Port 2 (P20-P23)
Port 3 (P30-P33)
Port 6 (P60-P63)
Port 7 (P70-P73)
Port 4 (P40-P43)
Port 5 (P50-P53)
Port 8 (P80, P81)
Note The P00 pin cannot specify connection of a built-in pull-up resistor.
Remark The port pins of the µPD75P0016 are not connected to a pull-up resistor by mask option, and
are always open.
Table 5-4. Specification of Built-in Pull-Up Resistors
Pull-up resistor incorporation specification method
Connection specification by software in 3-bit units
Connection specification by software in 4-bit units
Incorporation specification by mask option in 1-bit
units
Connection specification by software in-2-bit units
CHAPTER 5 PERIPHERAL HARDWARE FUNCTIONS
Bit of POGA Bit of POGB
Bit 0 —
Bit 1 —
Bit 2 —
Bit 3 —
Bit 6 —
Bit 7 —
— —
— Bit 0
81