4250 查看數據表（PDF） - MITSUBISHI ELECTRIC

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4250

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

4250 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

PIN DESCRIPTION

Pin

Name

VDD

Power supply

VSS

Ground

CNVSS

CNVSS

RESET

Reset input

XIN

System clock input

XOUT

System clock output

F0, F1

I/O port F

G0–G3

I/O port G

S0–S3

I/O port S

D0–D3

I/O port D

C

I/O port C

K

I/O port K

TOUT

INT

Timer output

Interrupt input

Input/Output

—

—

—

Input

Input

Output

I/O

I/O

I/O

I/O

I/O

I/O

Output

Input

Function

Connected to a plus power supply.

Connected to a 0 V power supply.

Connect CNVSS to VSS and apply “L” (0V) to CNVSS certainly.

Reset pulse input pin

I/O pins of the system clock generating circuit. Connect pins XIN and XOUT directly.

Then, pull up XIN pin through a resistor and pull down XOUT pin through a capacitor.

2-bit I/O port; for input use, set the latch of the specified bit to “1.” The output

structure is N-channel open-drain.

4-bit I/O port. For input use, set the latch of the specified bit to “1.” The output

structure is N-channel open-drain. Every pin of the ports has a key-on wakeup

function and a pull-up function. Both functions can be switched by software.

Ports G0 and G1 are also used as pins INT and TOUT, respectively.

4-bit I/O port. For input use, set the latch of the specified bit to “1.” The output

structure is N-channel open-drain. Every pin of the ports has a key-on wakeup

function which can be switched by software. Also, it is used to perform the logic

operation using register A.

Each pin of port D has an independent 1-bit wide I/O function. For input use, set

the latch of the specified bit to “1.” The output structure is N-channel open-drain.

Ports D2 and D3 are also used as ports C and K, respectively.

1-bit I/O port. For input use, set the latch of the specified bit to “1.” The output

structure is N-channel open-drain. Port C has a pull-up function which can be

switched by software. It is also used as port D2.

1-bit I/O port. For input use, set the latch of the specified bit to “1.” The output

structure is N-channel open-drain. Port K has a pull-up function which can be

switched by software. It is also used as port D3.

TOUT pin has the function to output the timer 1 underflow signal divided by 2. It is

also used as port G1.

INT pin accepts an external interrupt. It also accepts the input signal to return the

system from the RAM back-up state. It is also used as port G0.

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