NEC PD754244 Manuel D’Utilisation

User’s Manual  U10676EJ3V0UM

Each port pin of the 

µPD754244 can be connected to a pull-up resistor.  Some pins can be connected to a pull-

up resistor via software and others can be connected by a mask option.

Table 6-4 shows how to specify the connection of the pull-up resistor to each port pin.  The pull-up resistor is

connected via software in the format shown in Figure 6-11.

The pull-up resistor can be connected only to the pins of ports 3, 6, and 8 in the input mode.  When the pins are

set to the output mode, the pull-up resistor cannot be connected regardless of the setting of POGA and POGB.

Port (Pin Name)

Specifying Connection of Pull-up Resistor

Specified Bit

Port 3 (P30-P33)

Connection of pull-up resistor specified in 4-bit

POGA.3

Port 6 (P60-P63)

units via software

POGA.6

Port 7 (P70-P73)

Connection of pull-up resistor specified in 1-bit

—

units by mask option

Port 8 (P80-P83)

Connection of pull-up resistor specified in 1-bit

POGB.0

units via software

Specification

0

Pull-up resistor not connected

1

Pull-up resistor connected

7

6

5

4

3

2

1

0

–

–

PO3

–

–

–

PO6

–

Address

POGA

FDCH

Symbol

Port 3 (P30 to P33)

Port 6 (P60 to P63)

7

6

5

4

3

2

1

0

PO8

–

–

–

–

–

–

–

Address

POGB

FDEH

Symbol

Port 8 (P80)