User's Manual

CHAPTER 5 PERIPHERAL HARDWARE FUNCTIONS

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.

Table 5-4. Specification of Built-in Pull-Up Resistors

Port (pin name) Pull-up resistor incorporation specification method Bit of POGA Bit of POGB

Port 0 (P01-P03)

Note

Connection specification by software in 3-bit units Bit 0 —

Port 1 (P10-P13) Connection specification by software in 4-bit units Bit 1 —

Port 2 (P20-P23) Bit 2 —

Port 3 (P30-P33) Bit 3 —

Port 6 (P60-P63) Bit 6 —

Port 7 (P70-P73) Bit 7 —

Port 4 (P40-P43) Incorporation specification by mask option in 1-bit — —

Port 5 (P50-P53)

units

Port 8 (P80, P81) Connection specification by software in-2-bit units — Bit 0

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.