NEC PD750008 - Manual (Page 88)

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µPD750008 USER'S MANUAL
5.1.1 Types, Features, and Configurations of Digital I/O Ports
Table 5-1 lists the types of digital I/O ports.
Figures 5-2 to 5-6 show the configurations of the ports.
Table 5-1. Types and Features of Digital Ports
Port name
Function Operation and feature Remarks
(symbol)
PORT0 4-bit I/O Also used as INT4, SCK, SO/SB0,
and SI/SB1.
PORT1 Also used as INT0 to INT2 and
TI0.
PORT3 Note 1 4-bit I/O Also used as MD0 to MD3 Note 2 .
PORT6 Also used as KR0 to KR3.
PORT2 Also used as PTO0, PTO1, PCL,
and BUZ.
PORT7 Also used as KR4 to KR7.
PORT4 Note 1 4-bit I/O Allows input or output mode setting in Whether to use pull-up resistors
PORT5 Note 1 (N-ch open-drain; units of 4 bits. Ports 4 and 5 can be can be specified bit by bit with a
can withstand paired, allowing data I/O in units of mask option Note 3 .
13V) 8 bits.
PORT8 2-bit I/O Allows input or output mode setting in
units of 2 bits.
Notes 1. Can directly drive the LED.
2. Only for the µPD75P0016.
3. The µPD75P0016 does not have a mask option and cannot be connected with a pull-up resistor.
P10 is also used as an external vectored interrupt input pin. This input is provided with a noise eliminator.
(See Section 6.3 for details.)
When the RESET signal is generated, output latches of ports 2 to 8 are cleared to 0 and the output buffer
is turned off so that these ports are in the input mode.
Allows read and test at any timeregard
less of the operation modes of another
functions assigned to these pins.
Allows input or output mode setting bit
by bit.
Ports 6 and 7 can be paired, allowing
data I/O in units of 8 bits. Allows input
or output mode setting in units of 4 bits.
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