3819 Datasheet, PDF (4/61 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
3819 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PIN DESCRIPTION
Pin
VCC, VSS
VEE
VREF
AVSS
RESET
XIN
Name
Power source
Pull-down
Power source
Analog reference
voltage
Analog power source
Reset input
Clock input
XOUT
Clock output
P00/SEG32/
DIG0–P07/ Output port P0
SEG39/DIG7
Function
•Apply voltage of 4.0 to 5.5 V to VCC, and 0 V to VSS.
Function except a port function
•Applies voltage supplied to pull-down resistors of ports P0, P1, P20–P23, P3, and P9.
•Reference voltage input pin for A-D converter and D-A converter
•GND input pin for A-D converter and D-A converter
•Connect AVSS to VSS.
•Reset input pin for active “L”
•Input and output pins for the main clock generating circuit
•Feedback resistor is built in between XIN pin and XOUT pin.
•Connect a ceramic resonator or a quartz-crystal oscillator between the XIN pin and XOUT pin to
set oscillation frequency.
•If an external clock is used, connect the clock source to the XIN pin and leave the XOUT pin
open.
•This clock is used as the oscillating source of system clock.
•8-bit output port
•This port builds in pull-down resistor between
port P0 and the VEE pin.
•At reset this port is set to VEE level.
•The high-breakdown-voltage P-channel
open-drain
FLD automatic display pins
P10/SEG40/
DIG8–P17/
DIG15
P20/DIG16–
P23/DIG19
Output port P1
Output port P2
P24–P27
I/O port P2
P30/SEG24–
P37/SEG31
Output port P3
P40/INT0,
P45/INT1/
ZCR
Input port P4
P42/INT2–
P44/INT4
P41
P46/T1OUT,
P47/T3OUT
I/O port P4
•8-bit output port with the same function as
port P0
FLD automatic display pins
•4-bit output port with the same function as
port P0
FLD automatic display pins
•4-bit I/O port
•I/O direction register allows each pin to be individually programmed as either input or output.
•At reset this port is set to input mode.
•TTL input level
•CMOS 3-state output
•8-bit output port with the same function as
port P0
FLD automatic display pins
•2-bit input port
•CMOS compatible input level
External interrupt input pins
A zero cross detection circuit input pin (P45)
•6-bit CMOS I/O port with the same function
as ports P24–P27
•CMOS compatible input level
•CMOS 3-state output
Timer output pins
3