LAPIS Semiconductor ML610421, User Manual, Page: 39 / 437

ML610Q421/ML610Q422/ML610421 User’s Manual
Chapter 1 Overview
1 – 24
1.3.3 Description of Pins
Pin name I/O Description
Primary/
Secondary/
Tertiary
Logic
System
RESET_N I
Reset input pin. When this pin is set to a “L” level, system reset mode is
set and the internal section is initialized. When this pin is set to a “H” level
subsequently, program execution starts. A pull-up resistor is internally
connected.
— Negative
XT0 I
Crystal connection pin for low-speed clock.
A 32.768 kHz crystal oscillator (see measuring circuit 1) is connected to
this pin. Capacitors CDL and CGL are connected across this pin and V
SS
as required.
— —
XT1 O
— —
OSC0 I
Crystal/ceramic connection pin for high-speed clock.
A crystal or ceramic is connected to this pin (4.1 MHz max.). Capacitors
CDH and CGH (see measuring circuit 1) are connected across this pin
and V
SS
.
This pin is used as the secondary function of the P10 pin(OSC0) and P11
pin(OSC1).
Secondary —
OSC1 O Secondary —
LSCLK O Low-speed clock output pin. This pin is used as the secondary function of
the P20 pin.
Secondary —
OUTCLK O High-speed clock output pin. This pin is used as the secondary function
of the P21 pin.
Secondary —
General-purpose input port
P00-P03 I
General-purpose input port.
Since these pins have secondary functions, the pins cannot be used as a
port when the secondary functions are used.
Primary Positive
P10-P11 I
General-purpose input port.
Since these pins have secondary functions, the pins cannot be used as a
port when the secondary functions are used.
Primary Positive
General-purpose output port
P20-P22 O General-purpose output port.
Since these pins have secondary functions, the pins cannot be used as a
port when the secondary functions are used.
Primary Positive
General-purpose input/output port
P30-P35 I/O General-purpose input/output port.
Since these pins have secondary functions, the pins cannot be used as a
port when the secondary functions are used.
Primary Positive
P40-P47 I/O General-purpose input/output port.
Since these pins have secondary functions, the pins cannot be used as a
port when the secondary functions are used.
Primary Positive
PA0-PA7 I/O General-purpose input/output port.
These pins are for the ML610Q421/ML610421, but are not provided in
the ML610Q422.
Primary Positive