Table of Contents
Advertisement
2.4.2 Dedicated pins
(1) 14-bit PWM output (D-A) pin
This is a 14-bit PWM signal output pin. This pin also can be used for 1-bit general-purpose output
port. The output structure is CMOS output.
(2) Vertical and horizontal synchronous signal input pins (V
These pins input the vertical and horizontal synchronous signals for CRT display.
(3) Test input pin (CNV
Connect this pin to V
(4) Reset input pin (RESET)
This pin inputs reset signal. To reset the microcomputer, hold the RESET pin at a LOW level for
2 µ s or more. Reset is released when HIGH level is applied to the RESET pin. For details, refer to
"2.15 Reset."
(5) Clock I/O pins (X
These pins are I/O pins of main clock f(X
circuit, set the oscillation frequency by connecting an external ceramic resonator or a quartz-crystal
oscillator between pins X
When inputting an external clock, connect the external clock to the X
open.
The output structure of X
(6) Power source input pin (V
These pins supply the power source to a microcomputer. Apply voltage of 5 V ± 10 % to pin V
0 V to pin V
.
SS
)
SS
.
SS
, X
)
IN
OUT
and X
.
IN
OUT
pin is CMOS output.
OUT
, V
)
CC
SS
7220 Group User's Manual
FUNCTIONAL DESCRIPTION
SYNC
). Since a microcomputer has on-chip clock oscillation
IN
2.4 Input/Output pins
, H
)
SYNC
pin and leave the X
IN
pin
OUT
and
CC
2-23
Advertisement
Table of Contents
