GMS34004 Datasheet, PDF (12/105 Pages) Hynix Semiconductor – 4-BIT SINGLE CHIP MICROCOMPUTERS

Chapter 1. Introduction
I/O circuit types and options
GMS340 series I/O port types
Pin
V_DD
GND
RESET
K0~K3
D0~D9
R0~R3
REMOUT
OSC1
OSC2
I/O
-
-
Input
Input
Output
I/O
Output
Input
Output
Function
Connected to 2.0~4.0V power supply.
Connected to 0V power supply.
Used to input a manual reset. When the pin goes ¡ÈL¡È, the
D-output ports and REMOUT-output port are initialized to
¡ÈL¡È, and ROM address is set to address 0 on page 0.
4-bit input port.
Released STOP mode built in pull-up resistor by each pin as
masked option.
(It is released by ¡ÈL¡È input at STOP)
Each can be set and reset independently. The output is in
the form of N-channel-open-drain.
4-bit I/O port. (Input mode is set only when each of them
output ¡ÈH¡È.)
In outputting, each can be set and reset independently(or at
once.)
The output is in the form of N-channel-open-drain.
Pull-up resistor and STOP release mode can be respectively
selected as masked option for each bit. (It is released by
¡ÈL¡È input at STOP.)
High current output port.
The output is in the form of C-MOS.
The state of large current on is ¡ÈH¡È.
Oscillator input. Input to the oscillator circuit and connection
point for ceramic resonator.
Internal capacitors available as masked option.
A feedback resistor is connected between this pin and OSC2
Connect a ceramic resonator between this pin and OSC1.
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