UPD75518 NEC, UPD75518 Datasheet - Page 14

• Manufacturer Part Number: UPD75518
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

14
1.5 SELECTION OF A MASK OPTION
(1) Specification of built-in pull-up and pull-down resistors
(2) Specification of built-in feed-back resistors for subsystem clock oscillation
The following mask options are provided for pins.
Caution Even if built-in feed-back resistors are provided when no subsystem clock is used, operation is
P40-P43,
P50-P53,
P120-P123,
P130-P133,
P140-P143
P90-P93
XT1, XT2
not affected except increased power supply current I
Pin name
Pin name
Table 1-2 Selection of Pull-Up and Pull-Down Resistors
1
1
1
Pull-up resistors provided
(Can be specified bit by bit.)
Pull-down resistors provided
(Can be specified bit by bit.)
Feed-back resistors provided
(when a subsystem clock is used)
Table 1-3 Selection of Feed-Back Resistors
Mask option
Mask option
2
2
2
No feed-back resistors provided
(when no subsystem clock is used)
DD
No pull-up resistor provided
(Can be specified bit by bit.)
No pull-down resistor provided
(Can be specified bit by bit.)
.
PD75518(A)