Chapter 1. Introduction
I/O circuit types and options
GMS300 series I/O port types
Pin
VDD
I/O
Function
Connected to 2.0~4.0V power supply.
Connected to 0V power supply.
-
-
GND
Used to input a manual reset. When the pin goes L , the
D-output ports and REMOUT-output port are initialized to
L , and ROM address is set to address 0 on page 0.
RESET
Input
4-bit input port.
Released STOP mode built in pull-up resistor by each pin
as masked option.
K0~K3
D0~D9
Input
(It is released by
L input at STOP)
Each can be set and reset independently. The output is in
the form of N-channel-open-drain.
Output
4-bit I/O port. (Input mode is set only when each of them
output H .)
In outputting, each can be set and reset independently(or at
once.)
R0~R3
I/O
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 L
input at STOP.)
High current output port.
The output is in the form of C-MOS.
The state of large current on is H .
REMOUT
Output
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
OSC1
OSC2
Input
Output
Connect a ceramic resonator between this pin and OSC1.
1 - 10