UPD75518 NEC, UPD75518 Datasheet - Page 41

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

(1) Types, features, and configurations of digital I/O ports
PORT0
PORT1
PORT2
PORT3
PORT4
PORT5
PORT6
PORT7
PORT8
PORT9
PORT10
PORT11
PORT12
PORT13
PORT14
PORT15
Table 4-2 lists the types of digital I/O ports.
Fig. 4-2 through 4-8 present the configurations of the ports.
Note This port can directly drive the LED.
P10 is also used as an external vectored interrupt input pin. This input is provided with a noise eliminator.
(See Section 5.2 for details.)
The use of pull-up resistors can be specified for ports 0 (excluding pin P00/INT4), 1 to 3, 6, and 7 by software.
Port name
Note
Note
Note
4-bit input
4-bit I/O
4-bit I/O (N-chan-
nel open-drain 10 V)
4-bit I/O
4-bit input
4-bit I/O
4-bit I/O
4-bit I/O (N-chan-
nel open-drain 10 V)
4-bit input
Function
Table 4-2 Types and Features of Digital Ports
Allows read and test at any time regardless of
the operation modes of dual function pins.
Allows input or output mode setting in units
of 4 bits.
Allows input or output mode setting in units
of 1 or 4 bits.
Allows input or output
mode setting in units
of 4 bits.
Allows input or output
mode setting in units
of 1 or 4 bits.
Allows input or output
mode setting in units
of 4 bits.
Allows read and test at any time regardless of
the operation modes of dual function pins.
Allows input or output mode setting in units
of 4 bits.
Allows input or output mode setting in units
of 4 bits.
Allows input or output mode setting in units
of 4 bits.
Allows read and test at any time regardless of
the operation modes of dual function pins.
Operation and feature
Ports 4 and 5 may be
paired, allowing data
I/O in units of 8 bits.
Ports 6 and 7 may be
paired, allowing data
I/O in units of 8 bits.
Also used as INT4, SCK0, SO0/
SB0, and SI0/SB1.
Also used as INT0 to INT2, and
TI0.
Also used as PTO0, PCL, and BUZ.
The use of pull-up resistors can
be specified by mask options in
units of bits.
Also used as KR0 to KR3.
Also used as KR4 to KR7.
Also used as PPO, SCK1, SO1,
and SI1.
The use of a pull-down resistor
can be specified by a mask op-
tion in units of bits.
The use of pull-up resistors can
be specified by mask options in
units of bits.
Also used as AN4 to AN7.
Remarks
PD75518(A)
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