UPD75518 NEC, UPD75518 Datasheet - Page 50

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

50
(4) Use of pull-up and pull-down resistors
Port 0 (P01-P03)
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 12 (P120-P123)
Port 13 (P130-P133)
Port 14 (P140-P143)
Port 9 (P90-P93)
Ports 0 (excluding pin P00/INT4), 1 to 3, 6, and 7 can be provided with pull-up resistors by software.
Ports 4, 5, and 12 to 14 can be provided with pull-up resistors by mask options. Port 9 can also be provided
with pull-down resistors by mask options.
Note The P00 pin cannot be provided with a pull-up resistor.
Address
FDCH
Port (pin name)
Fig. 4-10 Format of the Register Group A Specifying the Use of Pull-Up Resistors
Note
PO7
Table 4-4 Specifying the Use of Pull-Up and Pull-Down Resistors
7
PO6
6
0
1
The use of pull-up resistors is specified in units of 3 bits
by software.
The use of pull-up resistors is specified in units of 4 bits
by software.
The use of pull-up resistors is specified in units of bits
by mask options.
The use of pull-down resistors is specified in units of bits
by mask options.
Specifying the use of pull-up and pull-down resistor
—
5
No built-in pull-up resistor provided
Built-in pull-up resistor provided
—
4
Description
PO3
3
PO2
2
PO1
1
PO0
0
Symbol
POGA
Port 0 (P01 - P03)
Port 1 (P10 - P13)
Port 2 (P20 - P23)
Port 3 (P30 - P33)
Port 6 (P60 - P63)
Port 7 (P70 - P73)
Bit in POGA
bit 0
bit 1
bit 2
bit 3
bit 6
bit 7
—
—
PD75518(A)