M38220E8-XXXFP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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производитель

M38220E8-XXXFP

Single-chip 8-bit CMOS microcomputer. PROM 16384 bytes, RAM 512 bytes. EPROM version.

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

3822 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

PIN DESCRIPTION

Table 1 Pin description (1)

Pin

VCC, VSS

VREF

AVSS

RESET

XIN

Name

Power source

Analog refer-

ence voltage

Analog power

source

Reset input

Clock input

XOUT

Clock output

VL1–VL3

LCD power

source

COM0–COM3 Common output

SEG0–SEG11 Segment output

P00/SEG16– I/O port P0

P07/SEG23

P10/SEG24– I/O port P1

P17/SEG31

P20 – P27 I/O port P2

P34/SEG12 – Input port P3

P37/SEG15

Function

Function except a port function

•Apply voltage of power source to VCC, and 0 V to VSS. (For the limits of VCC, refer to “Recom-

mended operating conditions”).

•Reference voltage input pin for A-D converter.

•GND input pin for A-D converter.

•Connect 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 and XOUT pins to set

the 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.

•Input 0 ≤ VL1 ≤ VL2 ≤ VL3 ≤ VCC voltage.

•Input 0 – VL3 voltage to LCD.

•LCD common output pins.

•COM2 and COM3 are not used at 1/2 duty ratio.

•COM3 is not used at 1/3 duty ratio.

•LCD segment output pins.

•8-bit output port.

•CMOS compatible input level.

•CMOS 3-state output structure.

•I/O direction register allows each port to be individually

programmed as either input or output.

•LCD segment output pins

•Pull-down control is enabled.

•8-bit I/O port.

•CMOS compatible input level.

•Key input (key-on wake-up) interrupt

input pins

•CMOS 3-state output structure.

•I/O direction register allows each pin to be individually

programmed as either input or output.

•Pull-up control is enabled.

•4-bit input port.

•LCD segment output pins

•CMOS compatible input level.

•Pull-down control is enabled.

4

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