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UPD75004CU Datasheet(PDF) 9 Page - NEC

Part # UPD75004CU
Description  4-BIT SINGLE-CHIP MICROCOMPUTER
PDF  66 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD75004CU Datasheet(HTML) 9 Page - NEC

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µPD75004, 75006, 75008
9
3.
PIN FUNCTIONS
3.1
PORT PINS (1/2)
Input/
Output
Circuit
TYPE*
1
P00
P01
P02
P03
P10
P11
P12
P13
P20
P21
P22
P23
P30*2
P31*2
P32*2
P33*2
P40-43*2
P50-53*2
Pin Name Input/Output
Function
8-Bit I/O
When Reset
Also Served
As
INT4
SCK
SO/SB0
SO/SB1
INT0
INT1
INT2
TI0
PTO0
—
PCL
BUZ
—
—
—
—
—
—
4-bit input port (PORT0)
Pull-up resistors can be specified in 3-bit
units for the P01 to P03 pins by software.
With noise elimination function
4-bit input port (PORT1)
Internal pull-up resistors can be
specified in 4-bit units by software.
4-bit input/output port (PORT2)
Internal pull-up resistors can be
specified in 4-bit units by software.
Programmable 4-bit input/output port
(PORT3)
This port can be specified for input/
output in bit units.
Internal pull-up resistors can be
specified in 4-bit units by software.
N-ch open-drain 4-bit input/output port
(PORT4)
Internal pull-up resistors can be
specified in bit units. (mask option)
Resistive voltage is 10 V in the open-
drain mode.
N-ch open-drain 4-bit input/output port
(PORT5)
Internal pull-up resistors can be
specified in bit units. (mask option)
Resistive voltage is 10 V in the open-
drain mode.
Input
Input
Input
Input
High level
(with internal
pull-up
resistor) or
high imped-
ance
B
B -C
E-B
E-B
M
M
X
X
X
X
*1: Circles indicate Schmitt trigger inputs.
2: Can directly drive LED.
Input
Input/
Output
Input/
Output
Input/
Output
Input
Input/
Output
Input/
Output
Input/
Output
Input/
Output
q
q
F -A
M -C
F -B
High level
(with internal
pull-up
resistor) or
high imped-
ance



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